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gg: add draw_ellipse_filled() + draw_ellipse_empty() APIs (#12869)

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Benjamin Stigsen
2021-12-17 20:19:18 +01:00
committed by GitHub
parent 08766da7e8
commit 75830f1fe3
5 changed files with 105 additions and 0 deletions
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35
vlib/gg/gg.c.v
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@ -1029,3 +1029,38 @@ pub fn dpi_scale() f32 {
}
return s
}
// 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, r_horizontal f32, r_vertical 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))) * r_horizontal, y +
math.cosf(f32(math.radians(i))) * r_vertical)
sgl.v2f(x + math.sinf(f32(math.radians(i + 10))) * r_horizontal, y +
math.cosf(f32(math.radians(i + 10))) * r_vertical)
}
sgl.end()
}
// 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, r_horizontal f32, r_vertical 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))) * r_horizontal, y +
math.cosf(f32(math.radians(i))) * r_vertical)
sgl.v2f(x + math.sinf(f32(math.radians(i + 10))) * r_horizontal, y +
math.cosf(f32(math.radians(i + 10))) * r_vertical)
}
sgl.end()
}