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gg: add draw_polygon_filled fn with rotation parameter (#14867)

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Emirhan Yener 2022-06-27 21:34:43 +03:00 committed by GitHub
parent ae7c566232
commit 6b2d3a826b
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1 changed files with 30 additions and 20 deletions
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50
vlib/gg/draw.c.v
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@ -521,7 +521,35 @@ pub fn (ctx &Context) draw_circle_empty(x f32, y f32, radius f32, c gx.Color) {
// `radius` defines the radius of the circle. // `radius` defines the radius of the circle.
// `c` is the fill color. // `c` is the fill color.
pub fn (ctx &Context) draw_circle_filled(x f32, y f32, radius f32, c gx.Color) { pub fn (ctx &Context) draw_circle_filled(x f32, y f32, radius f32, c gx.Color) {
ctx.draw_circle_with_segments(x, y, radius, radius_to_segments(radius), c) ctx.draw_polygon_filled(x, y, radius, radius_to_segments(radius), 0, c)
}
// draw_polygon_filled draws a filled polygon.
// `x`,`y` defines the center of the polygon.
// `size` defines the size of the polygon.
// `edge` defines edge number of the polygon.
// `rotation` defines rotation of the polygon.
// `c` is the fill color.
pub fn (ctx &Context) draw_polygon_filled(x f32, y f32, size f32, edge int, rotation f32, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
nx := x * ctx.scale
ny := y * ctx.scale
nr := size * ctx.scale
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
sgl.begin_triangle_strip()
for i := 0; i < edge + 1; i++ {
theta = 2.0 * f32(math.pi) * f32(i) / f32(edge)
xx = nr * math.cosf(theta + f32(math.radians(rotation)))
yy = nr * math.sinf(theta + f32(math.radians(rotation)))
sgl.v2f(xx + nx, yy + ny)
sgl.v2f(nx, ny)
}
sgl.end()
} }
// draw_circle_with_segments draws a filled circle with a specific number of segments. // draw_circle_with_segments draws a filled circle with a specific number of segments.
@ -530,25 +558,7 @@ pub fn (ctx &Context) draw_circle_filled(x f32, y f32, radius f32, c gx.Color) {
// `segments` affects how smooth/round the circle is. // `segments` affects how smooth/round the circle is.
// `c` is the fill color. // `c` is the fill color.
pub fn (ctx &Context) draw_circle_with_segments(x f32, y f32, radius f32, segments int, c gx.Color) { pub fn (ctx &Context) draw_circle_with_segments(x f32, y f32, radius f32, segments int, c gx.Color) {
if c.a != 255 { ctx.draw_polygon_filled(x, y, radius, segments, 0, c)
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
nx := x * ctx.scale
ny := y * ctx.scale
nr := radius * ctx.scale
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 = nr * math.cosf(theta)
yy = nr * math.sinf(theta)
sgl.v2f(xx + nx, yy + ny)
sgl.v2f(nx, ny)
}
sgl.end()
} }
// draw_circle_line draws the outline of a circle with a specific number of segments. // draw_circle_line draws the outline of a circle with a specific number of segments.