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gg: add draw_circle and draw_arc (#6594)

pull/6595/head^2
scurty-labs 2020-10-10 01:26:08 -07:00 committed by GitHub
parent d56072eb53
commit b2fdd7fbaf
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1 changed files with 107 additions and 1 deletions
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108
vlib/gg/gg.v
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@ -284,7 +284,113 @@ pub fn (ctx &Context) draw_empty_rect(x, y, w, h f32, c gx.Color) {
sgl.end()
}
pub fn (ctx &Context) draw_circle(x, y, r f32, c gx.Color) {
pub fn (ctx &Context) draw_circle_line(x, y, r int, 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)
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
sgl.begin_line_strip()
for i := 0; i < segments+1; i++ {
theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + x, yy + y)
}
sgl.end()
}
pub fn (ctx &Context) draw_circle(x, y, r int, 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)
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
sgl.begin_triangle_strip()
for i := 0; i < segments+1; i++ {
theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + x, yy + y)
sgl.v2f(x, y)
}
sgl.end()
}
pub fn (ctx &Context) draw_arc_line(x, y, r int, start_angle f32, arc_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)
mut theta := f32(arc_angle / f32(segments))
tan_factor := math.tanf(theta)
rad_factor := math.cosf(theta)
mut xx := f32(r * math.cosf(start_angle))
mut yy := f32(r * math.sinf(start_angle))
sgl.begin_line_strip()
for i := 0; i < segments+1; i++ {
sgl.v2f(xx + x, yy + y)
tx := -yy
ty := xx
xx += tx * tan_factor
yy += ty * tan_factor
xx *= rad_factor
yy *= rad_factor
}
sgl.end()
}
pub fn (ctx &Context) draw_arc(x, y, r int, start_angle f32, arc_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)
mut theta := f32(arc_angle / f32(segments))
tan_factor := math.tanf(theta)
rad_factor := math.cosf(theta)
mut xx := f32(r * math.cosf(start_angle))
mut yy := f32(r * math.sinf(start_angle))
sgl.begin_triangle_strip()
for i := 0; i < segments+1; i++ {
sgl.v2f(xx + x, yy + y)
sgl.v2f(x, y)
tx := -yy
ty := xx
xx += tx * tan_factor
yy += ty * tan_factor
xx *= rad_factor
yy *= rad_factor
}
sgl.end()
}
pub fn (gg &Context) begin() {