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gg: add draw_ring() (#12817)

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Benjamin Stigsen 2021-12-13 20:03:42 +01:00 committed by GitHub
parent b1a9bf29db
commit 76f6f99bce
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vlib/gg/gg.v
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@ -529,6 +529,53 @@ pub fn (ctx &Context) draw_line_with_config(x f32, y f32, x2 f32, y2 f32, config
sgl.pop_matrix()
}
pub fn (ctx &Context) draw_ring(x f32, y f32, inner_r f32, outer_r f32, start_angle f32, end_angle f32, segments int, color gx.Color) {
if start_angle == end_angle || outer_r <= 0.0 {
return
}
mut r1 := inner_r
mut r2 := outer_r
mut a1 := start_angle
mut a2 := end_angle
// TODO: Maybe this does not make since inner_r and outer_r is actually integers?
if outer_r < inner_r {
r1, r2 = r2, r1
if r2 <= 0.0 {
r2 = 0.1
}
}
if a2 < a1 {
a1, a2 = a2, a1
}
if r1 <= 0.0 {
ctx.draw_arc(x, y, int(r2), a1, a2, segments, color)
return
}
mut step_length := (a2 - a1) / f32(segments)
mut angle := a1
sgl.begin_quads()
sgl.c4b(color.r, color.g, color.b, color.a)
for _ in 0 .. segments {
sgl.v2f(x + f32(math.sin(angle)) * r1, y + f32(math.cos(angle) * r1))
sgl.v2f(x + f32(math.sin(angle)) * r2, y + f32(math.cos(angle) * r2))
sgl.v2f(x + f32(math.sin(angle + step_length)) * r2, y + f32(math.cos(angle +
step_length) * r2))
sgl.v2f(x + f32(math.sin(angle + step_length)) * r1, y + f32(math.cos(angle +
step_length) * r1))
angle += step_length
}
sgl.end()
}
pub fn (ctx &Context) draw_rounded_rect(x f32, y f32, w f32, h f32, radius f32, color gx.Color) {
sgl.c4b(color.r, color.g, color.b, color.a)
sgl.begin_triangle_strip()