gg: filled arcs and circles
parent
ed55778d2a
commit
6c5879add9
42
vlib/gg/gg.v
42
vlib/gg/gg.v
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@ -219,7 +219,15 @@ pub fn (ctx &GG) draw_rect(x, y, w, h f32, c gx.Color) {
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ctx.draw_rect2(x, y, w, h, c)
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ctx.draw_rect2(x, y, w, h, c)
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}
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}
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pub fn (ctx &GG) draw_circle(x, y, radius int, c gx.Color) {
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// Useful for debugging meshes.
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pub fn set_mode_wireframe() {
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C.glPolygonMode(C.GL_FRONT_AND_BACK, C.GL_LINE)
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}
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pub fn set_mode_point() {
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C.glPolygonMode(C.GL_FRONT_AND_BACK, C.GL_POINT)
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}
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pub fn set_mode_fill() {
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C.glPolygonMode(C.GL_FRONT_AND_BACK, C.GL_FILL)
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}
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}
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/*
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/*
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@ -441,6 +449,38 @@ pub fn (ctx &GG) draw_arc(x, y, r, start_angle, end_angle f32, segments int, col
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gl.draw_arrays(C.GL_LINE_STRIP, 0, segments + 1)
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gl.draw_arrays(C.GL_LINE_STRIP, 0, segments + 1)
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}
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}
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pub fn (ctx &GG) draw_filled_arc(x, y, r, start_angle, end_angle f32, segments int, color gx.Color) {
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ctx.shader.set_int('has_texture', 0)
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C.glDeleteBuffers(1, &ctx.vao)
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C.glDeleteBuffers(1, &ctx.vbo)
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ctx.shader.use()
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ctx.shader.set_color('color', color)
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start_rads := start_angle * 0.0174533 // deg -> rad approx
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end_rads := end_angle * 0.0174533
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rad_increment := end_rads / segments
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mut vertices := []f32
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mut i := 1
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vertices << [x, y]
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vertices << [x + f32(math.cos(start_angle)) * r, y + f32(math.sin(start_angle)) * r]
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for i < segments {
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theta := f32(i) * rad_increment
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vertices << [x + f32(math.cos(theta)) * r, y + f32(math.sin(theta)) * r]
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i++
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}
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// Add the last vertex at the final arc angle.
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vertices << [x + f32(math.cos(end_rads)) * r, y + f32(math.sin(end_rads)) * r]
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gl.bind_vao(ctx.vao)
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gl.set_vbo(ctx.vbo, vertices, C.GL_STATIC_DRAW)
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gl.vertex_attrib_pointer(0, 2, C.GL_FLOAT, false, 2, 0)
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gl.enable_vertex_attrib_array(0)
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gl.bind_vao(ctx.vao)
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gl.draw_arrays(C.GL_TRIANGLE_FAN, 0, segments + 2)
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}
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pub fn (ctx &GG) draw_circle(x, y, r f32, color gx.Color) {
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ctx.draw_filled_arc(x, y, r, 0, 360, 32 + int(r / 2), color)
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}
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/*
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/*
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pub fn (c &GG) draw_gray_line(x, y, x2, y2 f32) {
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pub fn (c &GG) draw_gray_line(x, y, x2, y2 f32) {
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c.draw_line(x, y, x2, y2, gx.Gray)
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c.draw_line(x, y, x2, y2, gx.Gray)
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