65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
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#include <pd/lithium/math.hpp>
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namespace PD {
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namespace Li {
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namespace Math {
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PD_API bool InBounds(const fvec2& pos, const fvec2& size, const fvec4& rect) {
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return (pos.x + size.x >= rect.x && pos.y + size.y >= rect.y &&
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pos.x <= rect.z && pos.y <= rect.w);
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}
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PD_API bool InBounds(const fvec2& pos, const fvec4& rect) {
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return (pos.x > rect.x && pos.x < rect.x + rect.z && pos.y > rect.y &&
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pos.y < rect.y + rect.w);
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}
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PD_API bool InBounds(const fvec2& a, const fvec2& b, const fvec2& c,
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const fvec4& rect) {
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return ((a.x < rect.z && b.x < rect.z && c.x < rect.z) ||
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(a.y < rect.w && b.y < rect.w && c.y < rect.w) ||
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(a.x > 0 && b.x > 0 && c.x > 0) || (a.y > 0 && b.y > 0 && c.y > 0));
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}
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PD_API void RotateCorner(fvec2& pos, float sinus, float cosinus) {
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float x = pos.x * cosinus - pos.y * sinus;
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float y = pos.y * cosinus - pos.x * sinus;
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pos = fvec2(x, y);
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}
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PD_API Rect PrimRect(const fvec2& pos, const fvec2& size, float a) {
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fvec2 c = size * 0.5f; // Center
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fvec2 corner[4] = {
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fvec2(-c.x, -c.y),
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fvec2(-c.x + size.x, -c.y),
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fvec2(-c.x, -c.y + size.y),
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fvec2(-c.x + size.x, -c.y + size.y),
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};
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// Only rotate if required
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if (a != 0.f) {
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float s = std::sin(a);
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float co = std::cos(a);
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for (int i = 0; i < 4; i++) {
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RotateCorner(corner[i], s, co);
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}
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}
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// Return Result
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return Rect(corner[0] + pos + c, corner[1] + pos + c, corner[2] + pos + c,
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corner[3] + pos + c);
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}
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PD_API Rect PrimLine(const fvec2& a, const fvec2& b, int t) {
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// Using the vec maths api makes the code as short as it is
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vec2 dir = a - b;
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float len = dir.Len();
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vec2 unit_dir = dir / len;
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vec2 perpendicular(-unit_dir.y, unit_dir.x);
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vec2 off = perpendicular * ((float)t * 0.5f);
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return Rect(a + off, b + off, a - off, b - off);
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}
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} // namespace Math
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} // namespace Li
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} // namespace PD
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