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gg: new draw_empty_rounded_rect() (#6891)

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hirossan4049 2020-11-21 23:40:02 +09:00 committed by GitHub
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commit 54df7d1daf
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56
vlib/gg/gg.v
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@ -457,7 +457,61 @@ pub fn (ctx &Context) draw_line(x f32, y f32, x2 f32, y2 f32, c gx.Color) {
pub fn (ctx &Context) draw_rounded_rect(x f32, y f32, width f32, height f32, radius f32, color gx.Color) {
}
pub fn (ctx &Context) draw_empty_rounded_rect(x f32, y f32, width f32, height f32, radius f32, border_color gx.Color) {
pub fn (ctx &Context) draw_empty_rounded_rect(x f32, y f32, w f32, h f32, radius f32, border_color gx.Color) {
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
r := radius * f32(ctx.scale)
nx := x * f32(ctx.scale)
ny := y * f32(ctx.scale)
width := w * f32(ctx.scale)
height := h * f32(ctx.scale)
segments := 2 * math.pi * r
segdiv := segments / 4
rb := 0
lb := int(rb + segdiv)
lt := int(lb + segdiv)
rt := int(lt + segdiv)
sgl.c4b(border_color.r, border_color.g, border_color.b, border_color.a)
sgl.begin_line_strip()
// left top
lx := nx + r
ly := ny + r
for i in lt .. rt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lx, yy + ly)
}
// right top
mut rx := nx + 2 * width - r
mut ry := ny + r
for i in rt .. int(segments) {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rx, yy + ry)
}
// right bottom
mut rbx := rx
mut rby := ny + 2 * height - r
for i in rb .. lb {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rbx, yy + rby)
}
// left bottom
mut lbx := lx
mut lby := ny + 2 * height - r
for i in lb .. lt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lbx, yy + lby)
}
sgl.v2f(lx + xx, ly)
sgl.end()
}
fn C.WaitMessage()