814 lines
22 KiB
V
814 lines
22 KiB
V
// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
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module gg
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import gx
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import sokol
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import sokol.sgl
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import math
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//---- pixel
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[inline]
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pub fn (ctx &Context) draw_pixel(x f32, y f32, c gx.Color) {
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_points()
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sgl.v2f(x * ctx.scale, y * ctx.scale)
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sgl.end()
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}
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// Sets pixels from an array of points [x, y, x2, y2, etc...]
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[direct_array_access; inline]
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pub fn (ctx &Context) draw_pixels(points []f32, c gx.Color) {
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assert points.len % 2 == 0
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len := points.len / 2
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_points()
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for i in 0 .. len {
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x, y := points[i * 2], points[i * 2 + 1]
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sgl.v2f(x * ctx.scale, y * ctx.scale)
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}
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sgl.end()
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}
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//---- line
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// Draws a line between the points provided
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pub fn (ctx &Context) draw_line(x f32, y f32, x2 f32, y2 f32, c gx.Color) {
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$if macos {
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if ctx.native_rendering {
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// Make the line more clear on hi dpi screens: draw a rectangle
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mut width := math.abs(x2 - x)
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mut height := math.abs(y2 - y)
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if width == 0 {
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width = 1
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} else if height == 0 {
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height = 1
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}
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ctx.draw_rect_filled(x, y, f32(width), f32(height), c)
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return
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}
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}
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_line_strip()
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sgl.v2f(x * ctx.scale, y * ctx.scale)
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sgl.v2f(x2 * ctx.scale, y2 * ctx.scale)
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sgl.end()
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}
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// Draws a line between the points provided with the PenConfig
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pub fn (ctx &Context) draw_line_with_config(x f32, y f32, x2 f32, y2 f32, config PenConfig) {
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if config.color.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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if config.thickness <= 0 {
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return
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}
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nx := x * ctx.scale
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ny := y * ctx.scale
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nx2 := x2 * ctx.scale
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ny2 := y2 * ctx.scale
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dx := nx2 - nx
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dy := ny2 - ny
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length := math.sqrtf(math.powf(x2 - x, 2) + math.powf(y2 - y, 2))
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theta := f32(math.atan2(dy, dx))
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sgl.push_matrix()
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sgl.translate(nx, ny, 0)
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sgl.rotate(theta, 0, 0, 1)
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sgl.translate(-nx, -ny, 0)
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if config.line_type == .solid {
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ctx.draw_rect_filled(x, y, length, config.thickness, config.color)
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} else {
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size := if config.line_type == .dotted { config.thickness } else { config.thickness * 3 }
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space := if size == 1 { 2 } else { size }
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mut available := length
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mut start_x := x
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for i := 0; available > 0; i++ {
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if i % 2 == 0 {
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ctx.draw_rect_filled(start_x, y, size, config.thickness, config.color)
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available -= size
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start_x += size
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continue
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}
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available -= space
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start_x += space
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}
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}
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sgl.pop_matrix()
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}
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//---- polyline
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// draw_empty_poly draws the borders of a polygon, given an array of points, and a color.
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// Note that the points must be given in clockwise order.
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pub fn (ctx &Context) draw_poly_empty(points []f32, c gx.Color) {
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assert points.len % 2 == 0
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len := points.len / 2
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assert len >= 3
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_line_strip()
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for i in 0 .. len {
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sgl.v2f(points[2 * i] * ctx.scale, points[2 * i + 1] * ctx.scale)
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}
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sgl.v2f(points[0] * ctx.scale, points[1] * ctx.scale)
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sgl.end()
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}
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// draw_convex_poly draws a convex polygon, given an array of points, and a color.
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// Note that the points must be given in clockwise order.
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pub fn (ctx &Context) draw_convex_poly(points []f32, c gx.Color) {
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assert points.len % 2 == 0
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len := points.len / 2
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assert len >= 3
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_triangle_strip()
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x0 := points[0] * ctx.scale
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y0 := points[1] * ctx.scale
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for i in 1 .. (len / 2 + 1) {
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sgl.v2f(x0, y0)
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sgl.v2f(points[i * 4 - 2] * ctx.scale, points[i * 4 - 1] * ctx.scale)
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sgl.v2f(points[i * 4] * ctx.scale, points[i * 4 + 1] * ctx.scale)
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}
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if len % 2 == 0 {
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sgl.v2f(points[2 * len - 2] * ctx.scale, points[2 * len - 1] * ctx.scale)
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}
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sgl.end()
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}
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//---- rectangle
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pub fn (ctx &Context) draw_rect_empty(x f32, y f32, w f32, h f32, c gx.Color) {
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_line_strip()
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sgl.v2f(x * ctx.scale, y * ctx.scale)
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sgl.v2f((x + w) * ctx.scale, y * ctx.scale)
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sgl.v2f((x + w) * ctx.scale, (y + h) * ctx.scale)
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sgl.v2f(x * ctx.scale, (y + h) * ctx.scale)
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sgl.v2f(x * ctx.scale, (y - 1) * ctx.scale)
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sgl.end()
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}
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pub fn (ctx &Context) draw_rect_filled(x f32, y f32, w f32, h f32, c gx.Color) {
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$if macos {
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if ctx.native_rendering {
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C.darwin_draw_rect(x, ctx.height - (y + h), w, h, c)
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return
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}
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}
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_quads()
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sgl.v2f(x * ctx.scale, y * ctx.scale)
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sgl.v2f((x + w) * ctx.scale, y * ctx.scale)
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sgl.v2f((x + w) * ctx.scale, (y + h) * ctx.scale)
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sgl.v2f(x * ctx.scale, (y + h) * ctx.scale)
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sgl.end()
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}
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// draw_rounded_rect_empty draws the outline of a rounded rectangle
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pub fn (ctx &Context) draw_rounded_rect_empty(x f32, y f32, w f32, h f32, radius f32, c gx.Color) {
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mut theta := f32(0)
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mut xx := f32(0)
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mut yy := f32(0)
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r := radius * ctx.scale
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nx := x * ctx.scale
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ny := y * ctx.scale
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width := w * ctx.scale
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height := h * ctx.scale
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segments := 2 * math.pi * r
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segdiv := segments / 4
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rb := 0
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lb := int(rb + segdiv)
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lt := int(lb + segdiv)
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rt := int(lt + segdiv)
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_line_strip()
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// left top
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lx := nx + r
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ly := ny + r
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theta_coeff := 2 * f32(math.pi) / segments
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for i in lt .. rt {
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theta = theta_coeff * f32(i)
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xx = r * math.cosf(theta)
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yy = r * math.sinf(theta)
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sgl.v2f(xx + lx, yy + ly)
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}
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// right top
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mut rx := nx + width - r
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mut ry := ny + r
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for i in rt .. int(segments) {
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theta = theta_coeff * f32(i)
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xx = r * math.cosf(theta)
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yy = r * math.sinf(theta)
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sgl.v2f(xx + rx, yy + ry)
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}
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// right bottom
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mut rbx := rx
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mut rby := ny + height - r
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for i in rb .. lb {
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theta = theta_coeff * f32(i)
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xx = r * math.cosf(theta)
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yy = r * math.sinf(theta)
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sgl.v2f(xx + rbx, yy + rby)
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}
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// left bottom
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mut lbx := lx
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mut lby := ny + height - r
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for i in lb .. lt {
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theta = theta_coeff * f32(i)
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xx = r * math.cosf(theta)
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yy = r * math.sinf(theta)
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sgl.v2f(xx + lbx, yy + lby)
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}
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sgl.v2f(lx + xx, ly)
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sgl.end()
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}
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// draw_rounded_rect_filled draws a filled rounded rectangle
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pub fn (ctx &Context) draw_rounded_rect_filled(x f32, y f32, w f32, h f32, radius f32, c gx.Color) {
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_triangle_strip()
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mut theta := f32(0)
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mut xx := f32(0)
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mut yy := f32(0)
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r := radius * ctx.scale
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nx := x * ctx.scale
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ny := y * ctx.scale
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width := w * ctx.scale
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height := h * ctx.scale
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segments := 2 * math.pi * r
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segdiv := segments / 4
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rb := 0
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lb := int(rb + segdiv)
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lt := int(lb + segdiv)
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rt := int(lt + segdiv)
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// left top
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lx := nx + r
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ly := ny + r
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for i in lt .. rt {
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theta = 2 * f32(math.pi) * f32(i) / segments
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xx = r * math.cosf(theta)
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yy = r * math.sinf(theta)
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sgl.v2f(xx + lx, yy + ly)
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sgl.v2f(lx, ly)
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}
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// right top
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mut rx := nx + width - r
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mut ry := ny + r
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for i in rt .. int(segments) {
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theta = 2 * f32(math.pi) * f32(i) / segments
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xx = r * math.cosf(theta)
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yy = r * math.sinf(theta)
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sgl.v2f(xx + rx, yy + ry)
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sgl.v2f(rx, ry)
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}
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// right bottom
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mut rbx := rx
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mut rby := ny + height - r
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for i in rb .. lb {
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theta = 2 * f32(math.pi) * f32(i) / segments
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xx = r * math.cosf(theta)
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yy = r * math.sinf(theta)
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sgl.v2f(xx + rbx, yy + rby)
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sgl.v2f(rbx, rby)
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}
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// left bottom
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mut lbx := lx
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mut lby := ny + height - r
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for i in lb .. lt {
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theta = 2 * f32(math.pi) * f32(i) / segments
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xx = r * math.cosf(theta)
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yy = r * math.sinf(theta)
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sgl.v2f(xx + lbx, yy + lby)
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sgl.v2f(lbx, lby)
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}
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sgl.v2f(lx + xx, ly)
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sgl.v2f(lx, ly)
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sgl.end()
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sgl.begin_quads()
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sgl.v2f(lx, ly)
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sgl.v2f(rx, ry)
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sgl.v2f(rbx, rby)
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sgl.v2f(lbx, lby)
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sgl.end()
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}
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//---- triangle
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pub fn (ctx &Context) draw_triangle_empty(x f32, y f32, x2 f32, y2 f32, x3 f32, y3 f32, c gx.Color) {
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_line_strip()
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sgl.v2f(x * ctx.scale, y * ctx.scale)
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sgl.v2f(x2 * ctx.scale, y2 * ctx.scale)
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sgl.v2f(x3 * ctx.scale, y3 * ctx.scale)
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sgl.v2f(x * ctx.scale, y * ctx.scale)
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sgl.end()
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}
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pub fn (ctx &Context) draw_triangle_filled(x f32, y f32, x2 f32, y2 f32, x3 f32, y3 f32, c gx.Color) {
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_triangles()
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sgl.v2f(x * ctx.scale, y * ctx.scale)
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sgl.v2f(x2 * ctx.scale, y2 * ctx.scale)
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sgl.v2f(x3 * ctx.scale, y3 * ctx.scale)
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sgl.end()
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}
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//---- square
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[inline]
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pub fn (ctx &Context) draw_square_empty(x f32, y f32, s f32, c gx.Color) {
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ctx.draw_rect_empty(x, y, s, s, c)
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}
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[inline]
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pub fn (ctx &Context) draw_square_filled(x f32, y f32, s f32, c gx.Color) {
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ctx.draw_rect_filled(x, y, s, s, c)
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}
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//---- circle
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// The table here is derived by looking at the result of vlib/gg/testdata/tweak_circles.vv
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// and then choosing the most circle-ish drawing with the minimum number of segments.
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const small_circle_segments = [0, 2, 4, 6, 6, 8, 8, 13, 10, 18, 12, 12, 10, 13, 16, 15, 16]!
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[direct_array_access]
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fn radius_to_segments(r f32) int {
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if r < 30.0 {
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ir := int(math.ceil(r))
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if ir > 0 && ir < gg.small_circle_segments.len {
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return gg.small_circle_segments[ir]
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}
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return ir
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}
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return int(math.ceil(2 * math.pi * r / 8))
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}
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// draw_circle_empty draws an empty circle
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pub fn (ctx &Context) draw_circle_empty(x f32, y f32, radius f32, c gx.Color) {
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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nx := x * ctx.scale
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ny := y * ctx.scale
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nr := radius * ctx.scale
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mut theta := f32(0)
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mut xx := f32(0)
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mut yy := f32(0)
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segments := radius_to_segments(radius)
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sgl.c4b(c.r, c.g, c.b, c.a)
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sgl.begin_line_strip()
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for i := 0; i < segments + 1; i++ {
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theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
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xx = nr * math.cosf(theta)
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yy = nr * math.sinf(theta)
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sgl.v2f(xx + nx, yy + ny)
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}
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sgl.end()
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}
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// draw_circle_filled draws a filled circle
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pub fn (ctx &Context) draw_circle_filled(x f32, y f32, radius f32, c gx.Color) {
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ctx.draw_circle_with_segments(x, y, radius, radius_to_segments(radius), c)
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}
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// draw_circle_with_segments draws a circle with a specific number of segments (affects how smooth/round the circle is)
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pub fn (ctx &Context) draw_circle_with_segments(x f32, y f32, radius f32, segments int, c gx.Color) {
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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nx := x * ctx.scale
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ny := y * ctx.scale
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nr := radius * ctx.scale
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mut theta := f32(0)
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mut xx := f32(0)
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mut yy := f32(0)
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sgl.begin_triangle_strip()
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for i := 0; i < segments + 1; i++ {
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theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
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xx = nr * math.cosf(theta)
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yy = nr * math.sinf(theta)
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sgl.v2f(xx + nx, yy + ny)
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sgl.v2f(nx, ny)
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}
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sgl.end()
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}
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pub fn (ctx &Context) draw_circle_line(x f32, y f32, r int, segments int, c gx.Color) {
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$if macos {
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if ctx.native_rendering {
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C.darwin_draw_circle(x - r + 1, ctx.height - (y + r + 3), r, c)
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return
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}
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}
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if c.a != 255 {
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sgl.load_pipeline(ctx.timage_pip)
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}
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sgl.c4b(c.r, c.g, c.b, c.a)
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nx := x * ctx.scale
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ny := y * ctx.scale
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nr := r * ctx.scale
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mut theta := f32(0)
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mut xx := f32(0)
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mut yy := f32(0)
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sgl.begin_line_strip()
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for i := 0; i < segments + 1; i++ {
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theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
|
|
xx = nr * math.cosf(theta)
|
|
yy = nr * math.sinf(theta)
|
|
sgl.v2f(xx + nx, yy + ny)
|
|
}
|
|
sgl.end()
|
|
}
|
|
|
|
//---- slice
|
|
|
|
// draw_slice_empty draws the outline of a circle slice/pie
|
|
pub fn (ctx &Context) draw_slice_empty(x f32, y f32, outer_radius f32, start_angle f32, end_angle f32, segments int, c gx.Color) {
|
|
if c.a != 255 {
|
|
sgl.load_pipeline(ctx.timage_pip)
|
|
}
|
|
sgl.c4b(c.r, c.g, c.b, c.a)
|
|
theta := f32(end_angle / f32(segments))
|
|
tan_factor := math.tanf(theta)
|
|
rad_factor := math.cosf(theta)
|
|
nx := x * ctx.scale
|
|
ny := y * ctx.scale
|
|
mut xx := outer_radius * math.cosf(start_angle)
|
|
mut yy := outer_radius * math.sinf(start_angle)
|
|
sgl.begin_line_strip()
|
|
sgl.v2f(nx, ny)
|
|
for i := 0; i < segments + 1; i++ {
|
|
sgl.v2f(xx + nx, yy + ny)
|
|
tx := -yy
|
|
ty := xx
|
|
xx += tx * tan_factor
|
|
yy += ty * tan_factor
|
|
xx *= rad_factor
|
|
yy *= rad_factor
|
|
}
|
|
sgl.v2f(nx, ny)
|
|
sgl.end()
|
|
}
|
|
|
|
// draw_slice_filled draws a filled circle slice/pie
|
|
pub fn (ctx &Context) draw_slice_filled(x f32, y f32, radius f32, start_angle f32, end_angle f32, segments int, c gx.Color) {
|
|
if c.a != 255 {
|
|
sgl.load_pipeline(ctx.timage_pip)
|
|
}
|
|
sgl.c4b(c.r, c.g, c.b, c.a)
|
|
nx := x * ctx.scale
|
|
ny := y * ctx.scale
|
|
theta := f32(end_angle / f32(segments))
|
|
tan_factor := math.tanf(theta)
|
|
rad_factor := math.cosf(theta)
|
|
mut xx := radius * math.cosf(start_angle)
|
|
mut yy := radius * math.sinf(start_angle)
|
|
sgl.begin_triangle_strip()
|
|
for i := 0; i < segments + 1; i++ {
|
|
sgl.v2f(xx + nx, yy + ny)
|
|
sgl.v2f(nx, ny)
|
|
tx := -yy
|
|
ty := xx
|
|
xx += tx * tan_factor
|
|
yy += ty * tan_factor
|
|
xx *= rad_factor
|
|
yy *= rad_factor
|
|
}
|
|
sgl.end()
|
|
}
|
|
|
|
//---- arc
|
|
|
|
// draw_arc_empty draws the outline of an arc
|
|
pub fn (ctx &Context) draw_arc_empty(x f32, y f32, inner_radius f32, thickness f32, start_angle f32, end_angle f32, segments int, c gx.Color) {
|
|
if start_angle == end_angle || inner_radius <= 0.0 {
|
|
return
|
|
}
|
|
|
|
mut a1 := start_angle
|
|
mut a2 := end_angle
|
|
|
|
if a2 < a1 {
|
|
a1, a2 = a2, a1
|
|
}
|
|
|
|
if inner_radius <= 0.0 {
|
|
ctx.draw_slice_empty(x, y, int(thickness), a1, a2, segments, c)
|
|
return
|
|
}
|
|
|
|
outer_radius := inner_radius + thickness
|
|
mut step_length := (a2 - a1) / f32(segments)
|
|
mut angle := a1
|
|
|
|
sgl.begin_line_strip()
|
|
sgl.c4b(c.r, c.g, c.b, c.a)
|
|
|
|
// Outer circle
|
|
for _ in 0 .. segments {
|
|
msa := f32(math.sin(angle))
|
|
mca := f32(math.cos(angle))
|
|
ms := f32(math.sin(angle + step_length))
|
|
mc := f32(math.cos(angle + step_length))
|
|
sgl.v2f(x + msa * outer_radius, y + mca * outer_radius)
|
|
sgl.v2f(x + ms * outer_radius, y + mc * outer_radius)
|
|
angle += step_length
|
|
}
|
|
|
|
// Inner circle
|
|
for _ in 0 .. segments {
|
|
msa := f32(math.sin(angle))
|
|
mca := f32(math.cos(angle))
|
|
msb := f32(math.sin(angle - step_length))
|
|
mcb := f32(math.cos(angle - step_length))
|
|
sgl.v2f(x + msa * inner_radius, y + mca * inner_radius)
|
|
sgl.v2f(x + msb * inner_radius, y + mcb * inner_radius)
|
|
|
|
angle -= step_length
|
|
}
|
|
|
|
// Closing end
|
|
msa := f32(math.sin(angle))
|
|
mca := f32(math.cos(angle))
|
|
sgl.v2f(x + msa * inner_radius, y + mca * inner_radius)
|
|
sgl.v2f(x + msa * outer_radius, y + mca * outer_radius)
|
|
sgl.end()
|
|
}
|
|
|
|
// draw_arc_filled draws a filled arc
|
|
pub fn (ctx &Context) draw_arc_filled(x f32, y f32, inner_radius f32, thickness f32, start_angle f32, end_angle f32, segments int, c gx.Color) {
|
|
if start_angle == end_angle || inner_radius <= 0.0 {
|
|
return
|
|
}
|
|
|
|
mut a1 := start_angle
|
|
mut a2 := end_angle
|
|
|
|
if a2 < a1 {
|
|
a1, a2 = a2, a1
|
|
}
|
|
|
|
if inner_radius <= 0.0 {
|
|
ctx.draw_slice_filled(x, y, int(thickness), a1, a2, segments, c)
|
|
}
|
|
|
|
outer_radius := inner_radius + thickness
|
|
mut step_length := (a2 - a1) / f32(segments)
|
|
mut angle := a1
|
|
|
|
sgl.begin_quads()
|
|
sgl.c4b(c.r, c.g, c.b, c.a)
|
|
for _ in 0 .. segments {
|
|
msa := f32(math.sin(angle))
|
|
mca := f32(math.cos(angle))
|
|
sgl.v2f(x + msa * inner_radius, y + mca * inner_radius)
|
|
sgl.v2f(x + msa * outer_radius, y + mca * outer_radius)
|
|
|
|
ms := f32(math.sin(angle + step_length))
|
|
mc := f32(math.cos(angle + step_length))
|
|
sgl.v2f(x + ms * outer_radius, y + mc * outer_radius)
|
|
sgl.v2f(x + ms * inner_radius, y + mc * inner_radius)
|
|
|
|
angle += step_length
|
|
}
|
|
sgl.end()
|
|
}
|
|
|
|
//---- ellipse
|
|
|
|
// draw_ellipse_empty draws the outline of an ellipse, with a center at x,y
|
|
pub fn (ctx &Context) draw_ellipse_empty(x f32, y f32, rw f32, rh f32, c gx.Color) {
|
|
if c.a != 255 {
|
|
sgl.load_pipeline(ctx.timage_pip)
|
|
}
|
|
|
|
sgl.c4b(c.r, c.g, c.b, c.a)
|
|
sgl.begin_line_strip()
|
|
for i := 0; i < 360; i += 10 {
|
|
sgl.v2f(x + math.sinf(f32(math.radians(i))) * rw, y + math.cosf(f32(math.radians(i))) * rh)
|
|
sgl.v2f(x + math.sinf(f32(math.radians(i + 10))) * rw, y + math.cosf(f32(math.radians(i +
|
|
10))) * rh)
|
|
}
|
|
sgl.end()
|
|
}
|
|
|
|
// draw_ellipse_filled - draws an opaque elipse, with a center at x,y , filled with the color `c`
|
|
pub fn (ctx &Context) draw_ellipse_filled(x f32, y f32, rw f32, rh f32, c gx.Color) {
|
|
if c.a != 255 {
|
|
sgl.load_pipeline(ctx.timage_pip)
|
|
}
|
|
|
|
sgl.c4b(c.r, c.g, c.b, c.a)
|
|
sgl.begin_triangle_strip()
|
|
for i := 0; i < 360; i += 10 {
|
|
sgl.v2f(x, y)
|
|
sgl.v2f(x + math.sinf(f32(math.radians(i))) * rw, y + math.cosf(f32(math.radians(i))) * rh)
|
|
sgl.v2f(x + math.sinf(f32(math.radians(i + 10))) * rw, y + math.cosf(f32(math.radians(i +
|
|
10))) * rh)
|
|
}
|
|
sgl.end()
|
|
}
|
|
|
|
//---- bezier
|
|
|
|
// draw_cubic_bezier draws a cubic Bézier curve, also known as a spline, from four points.
|
|
// The four points is provided as one `points` array which contains a stream of point pairs (x and y coordinates).
|
|
// Thus a cubic Bézier could be declared as: `points := [x1, y1, control_x1, control_y1, control_x2, control_y2, x2, y2]`.
|
|
// Please see `draw_cubic_bezier_in_steps` to control the amount of steps (segments) used to draw the curve.
|
|
pub fn (ctx &Context) draw_cubic_bezier(points []f32, c gx.Color) {
|
|
ctx.draw_cubic_bezier_in_steps(points, u32(30 * ctx.scale), c)
|
|
}
|
|
|
|
// draw_cubic_bezier_in_steps draws a cubic Bézier curve, also known as a spline, from four points.
|
|
// The smoothness of the curve can be controlled with the `steps` parameter. `steps` determines how many iterations is
|
|
// taken to draw the curve.
|
|
// The four points is provided as one `points` array which contains a stream of point pairs (x and y coordinates).
|
|
// Thus a cubic Bézier could be declared as: `points := [x1, y1, control_x1, control_y1, control_x2, control_y2, x2, y2]`.
|
|
pub fn (ctx &Context) draw_cubic_bezier_in_steps(points []f32, steps u32, c gx.Color) {
|
|
assert steps > 0
|
|
assert points.len == 8
|
|
|
|
if c.a != 255 {
|
|
sgl.load_pipeline(ctx.timage_pip)
|
|
}
|
|
sgl.c4b(c.r, c.g, c.b, c.a)
|
|
|
|
sgl.begin_line_strip()
|
|
|
|
p1_x, p1_y := points[0], points[1]
|
|
p2_x, p2_y := points[6], points[7]
|
|
|
|
ctrl_p1_x, ctrl_p1_y := points[2], points[3]
|
|
ctrl_p2_x, ctrl_p2_y := points[4], points[5]
|
|
|
|
// The constant 3 is actually points.len() - 1;
|
|
|
|
step := f32(1.0) / steps
|
|
sgl.v2f(p1_x * ctx.scale, p1_y * ctx.scale)
|
|
for u := f32(0.0); u <= f32(1.0); u += step {
|
|
pow_2_u := u * u
|
|
pow_3_u := pow_2_u * u
|
|
|
|
x := pow_3_u * (p2_x + 3 * (ctrl_p1_x - ctrl_p2_x) - p1_x) +
|
|
3 * pow_2_u * (p1_x - 2 * ctrl_p1_x + ctrl_p2_x) + 3 * u * (ctrl_p1_x - p1_x) + p1_x
|
|
|
|
y := pow_3_u * (p2_y + 3 * (ctrl_p1_y - ctrl_p2_y) - p1_y) +
|
|
3 * pow_2_u * (p1_y - 2 * ctrl_p1_y + ctrl_p2_y) + 3 * u * (ctrl_p1_y - p1_y) + p1_y
|
|
|
|
sgl.v2f(x * ctx.scale, y * ctx.scale)
|
|
}
|
|
sgl.v2f(p2_x * ctx.scale, p2_y * ctx.scale)
|
|
|
|
sgl.end()
|
|
}
|
|
|
|
//---- deprecated
|
|
|
|
// Sets a pixel
|
|
[deprecated: 'use draw_pixel() instead']
|
|
pub fn (ctx &Context) set_pixel(x f32, y f32, c gx.Color) {
|
|
ctx.draw_pixel(x, y, c)
|
|
}
|
|
|
|
[deprecated: 'use draw_pixels() instead']
|
|
pub fn (ctx &Context) set_pixels(points []f32, c gx.Color) {
|
|
ctx.draw_pixels(points, c)
|
|
}
|
|
|
|
[deprecated: 'use draw_poly_empty() instead']
|
|
pub fn (ctx &Context) draw_empty_poly(points []f32, c gx.Color) {
|
|
ctx.draw_poly_empty(points, c)
|
|
}
|
|
|
|
// TODO: Fix alpha
|
|
[deprecated: 'use draw_rect_filled() instead']
|
|
pub fn (ctx &Context) draw_rect(x f32, y f32, w f32, h f32, c gx.Color) {
|
|
ctx.draw_rect_filled(x, y, w, h, c)
|
|
}
|
|
|
|
// Draws the outline of a rectangle
|
|
[deprecated: 'use draw_rect_empty() instead']
|
|
pub fn (ctx &Context) draw_empty_rect(x f32, y f32, w f32, h f32, c gx.Color) {
|
|
ctx.draw_rect_empty(x, y, w, h, c)
|
|
}
|
|
|
|
[deprecated: 'use draw_rounded_rect_empty()']
|
|
pub fn (ctx &Context) draw_empty_rounded_rect(x f32, y f32, w f32, h f32, radius f32, c gx.Color) {
|
|
ctx.draw_rounded_rect_empty(x, y, w, h, radius, c)
|
|
}
|
|
|
|
[deprecated: 'use draw_rounded_rect_filled()']
|
|
pub fn (ctx &Context) draw_rounded_rect(x f32, y f32, w f32, h f32, radius f32, c gx.Color) {
|
|
ctx.draw_rounded_rect_filled(x, y, w, h, radius, c)
|
|
}
|
|
|
|
// Draws the outline of a triangle
|
|
[deprecated: 'use draw_triangle_empty() instead']
|
|
pub fn (ctx &Context) draw_empty_triangle(x f32, y f32, x2 f32, y2 f32, x3 f32, y3 f32, c gx.Color) {
|
|
ctx.draw_triangle_empty(x, y, x2, y2, x3, y3, c)
|
|
}
|
|
|
|
// Draws a filled triangle
|
|
[deprecated: 'use draw_triangle_filled() instead']
|
|
pub fn (ctx &Context) draw_triangle(x f32, y f32, x2 f32, y2 f32, x3 f32, y3 f32, c gx.Color) {
|
|
ctx.draw_triangle_filled(x, y, x2, y2, x3, y3, c)
|
|
}
|
|
|
|
// Draws the outline of a square
|
|
[deprecated: 'use draw_square_empty() instead']
|
|
pub fn (ctx &Context) draw_empty_square(x f32, y f32, s f32, c gx.Color) {
|
|
ctx.draw_square_empty(x, y, s, c)
|
|
}
|
|
|
|
// Draws a filled square
|
|
[deprecated: 'use draw_square_filled() instead']
|
|
pub fn (ctx &Context) draw_square(x f32, y f32, s f32, c gx.Color) {
|
|
ctx.draw_square_filled(x, y, s, c)
|
|
}
|
|
|
|
[deprecated: 'use draw_circle_filled() instead']
|
|
pub fn (ctx &Context) draw_circle(x f32, y f32, radius f32, c gx.Color) {
|
|
ctx.draw_circle_filled(x, y, radius, c)
|
|
}
|
|
|
|
[deprecated: 'use draw_slice_empty() instead']
|
|
pub fn (ctx &Context) draw_empty_slice(x f32, y f32, radius f32, start_angle f32, end_angle f32, segments int, c gx.Color) {
|
|
ctx.draw_slice_empty(x, y, radius, start_angle, end_angle, segments, c)
|
|
}
|
|
|
|
[deprecated: 'use draw_slice_filled() instead']
|
|
pub fn (ctx &Context) draw_slice(x f32, y f32, radius f32, start_angle f32, end_angle f32, segments int, c gx.Color) {
|
|
ctx.draw_slice_filled(x, y, radius, start_angle, end_angle, segments, c)
|
|
}
|
|
|
|
[deprecated: 'use draw_arc_empty() instead']
|
|
pub fn (ctx &Context) draw_empty_arc(x f32, y f32, inner_radius f32, thickness f32, start_angle f32, end_angle f32, segments int, c gx.Color) {
|
|
ctx.draw_arc_empty(x, y, inner_radius, thickness, start_angle, end_angle, segments,
|
|
c)
|
|
}
|
|
|
|
[deprecated: 'use draw_arc_filled() instead']
|
|
pub fn (ctx &Context) draw_arc(x f32, y f32, inner_radius f32, thickness f32, start_angle f32, end_angle f32, segments int, c gx.Color) {
|
|
ctx.draw_arc_filled(x, y, inner_radius, thickness, start_angle, end_angle, segments,
|
|
c)
|
|
}
|
|
|
|
[deprecated: 'use draw_ellipse_empty() instead']
|
|
pub fn (ctx &Context) draw_empty_ellipse(x f32, y f32, rw f32, rh f32, c gx.Color) {
|
|
ctx.draw_ellipse_empty(x, y, rw, rh, c)
|
|
}
|
|
|
|
[deprecated: 'use draw_ellipse_filled() instead']
|
|
pub fn (ctx &Context) draw_ellipse(x f32, y f32, rw f32, rh f32, c gx.Color) {
|
|
ctx.draw_ellipse_filled(x, y, rw, rh, c)
|
|
}
|