gg: set_pixels() (#11236)

examples/gg/set_pixels.v

@@ -0,0 +1,39 @@
+module main
+
+import gg
+import gx
+
+struct App {
+mut:
+	gg &gg.Context
+}
+
+fn main() {
+	mut app := &App{
+		gg: 0
+	}
+	app.gg = gg.new_context(
+		bg_color: gx.rgb(174, 198, 255)
+		width: 100
+		height: 100
+		window_title: 'Set Pixels'
+		frame_fn: frame
+		user_data: app
+	)
+	app.gg.run()
+}
+
+fn frame(mut app App) {
+	mut pixels := []f32{}
+
+	for x in 30 .. 60 {
+		for y in 30 .. 60 {
+			pixels << f32(x)
+			pixels << f32(y)
+		}
+	}
+
+	app.gg.begin()
+	app.gg.set_pixels(pixels, gx.red)
+	app.gg.end()
+}

vlib/gg/gg.v

@@ -268,6 +268,27 @@ pub fn (ctx &Context) set_pixel(x f32, y f32, c gx.Color) {
 	ctx.draw_square(x, y, 1, c)
 }
 
+pub fn (ctx &Context) set_pixels(points []f32, c gx.Color) {
+	assert points.len % 2 == 0
+	len := points.len / 2
+
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+
+	sgl.c4b(c.r, c.g, c.b, c.a)
+	sgl.begin_quads()
+	for i in 0 .. len {
+		x, y := points[i * 2], points[i * 2 + 1]
+
+		sgl.v2f(x * ctx.scale, y * ctx.scale)
+		sgl.v2f((x + 1) * ctx.scale, y * ctx.scale)
+		sgl.v2f((x + 1) * ctx.scale, (y + 1) * ctx.scale)
+		sgl.v2f(x * ctx.scale, (y + 1) * ctx.scale)
+	}
+	sgl.end()
+}
+
 pub fn (ctx &Context) draw_triangle(x f32, y f32, x2 f32, y2 f32, x3 f32, y3 f32, c gx.Color) {
 	if c.a != 255 {
 		sgl.load_pipeline(ctx.timage_pip)