sam
91 lines
1.7 KiB
Odin
91 lines
1.7 KiB
Odin
package edit2d
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import "core:slice"
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import b2 "vendor:box2d"
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saturate :: proc(f : f32) -> f32 {
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return (f < 0.0) ? 0.0 : (f > 1.0) ? 1.0 : f
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}
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f32_to_u8_sat :: proc(val : f32) -> u8 {
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sat := saturate(val)
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sat *= 255
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sat += 0.5
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ret := cast(u8)sat
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return ret
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}
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float4_to_u32 :: proc(color : [4]f32) -> u32 {
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out : u32
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out = u32(f32_to_u8_sat(color.a)) << 24
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out |= u32(f32_to_u8_sat(color.r)) << 16
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out |= u32(f32_to_u8_sat(color.g)) << 8
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out |= u32(f32_to_u8_sat(color.b))
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return out
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}
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u32_to_float4 :: proc(color : u32) -> [4]f32 {
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ret : [4]f32
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ret.a = f32((color >> 24) & 0xFF) / 255.0
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ret.r = f32((color >> 16) & 0xFF) / 255.0
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ret.g = f32((color >> 8) & 0xFF) / 255.0
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ret.b = f32((color) & 0xFF) / 255.0
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return ret
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}
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centroid :: proc(points: []b2.Vec2) -> b2.Vec2{
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center := b2.Vec2{0,0}
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for p in points do center += p
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center /= f32(len(points))
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return center
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}
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cross :: proc(o, a, b : b2.Vec2) -> f32{
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return (a.x - o.x) * (b.y - o.y) - (a.y - o.y) * (b.x - o.x)
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}
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//For sorting
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curr_center : b2.Vec2
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sort_points_ccw :: proc(points : []b2.Vec2){
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if len(points) == 0 do return
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curr_center = centroid(points)
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slice.sort_by(points , proc(a, b: b2.Vec2) -> bool{
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c := cross(curr_center, a, b)
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if abs(c) < 1e-7{
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return b2.Distance(curr_center, a) < b2.Distance(curr_center, b)
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}
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return c > 0
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})
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}
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FlipDirection :: enum {
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Horizontal,
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Vertical,
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Both, // Flip both horizontally and vertically
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}
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flip_points :: proc(points: []b2.Vec2, direction : FlipDirection){
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for &vertex, i in points{
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switch direction {
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case .Horizontal:
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points[i] = b2.Vec2{-vertex.x, vertex.y}
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case .Vertical:
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points[i] = b2.Vec2{vertex.x, -vertex.y}
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case .Both:
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points[i] = b2.Vec2{-vertex.x, -vertex.y}
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}
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}
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}
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