88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
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#pragma once
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#include <core/vec2.h>
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#include <glm/gtc/matrix_transform.hpp>
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#include <glm/mat4x4.hpp>
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namespace extra2d {
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// ---------------------------------------------------------------------------
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// 2D 变换矩阵（基于 glm::mat4，兼容 OpenGL）
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// ---------------------------------------------------------------------------
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struct Transform2D {
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glm::mat4 matrix{1.0f}; // 单位矩阵
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Transform2D() = default;
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explicit Transform2D(const glm::mat4 &m) : matrix(m) {}
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static Transform2D identity() { return Transform2D{}; }
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static Transform2D translation(float x, float y) {
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Transform2D t;
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t.matrix = glm::translate(glm::mat4(1.0f), glm::vec3(x, y, 0.0f));
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return t;
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}
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static Transform2D translation(const Vec2 &v) {
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return translation(v.x, v.y);
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}
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static Transform2D rotation(float degrees) {
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Transform2D t;
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t.matrix = glm::rotate(glm::mat4(1.0f), degrees * DEG_TO_RAD,
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glm::vec3(0.0f, 0.0f, 1.0f));
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return t;
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}
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static Transform2D scaling(float sx, float sy) {
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Transform2D t;
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t.matrix = glm::scale(glm::mat4(1.0f), glm::vec3(sx, sy, 1.0f));
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return t;
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}
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static Transform2D scaling(float s) { return scaling(s, s); }
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static Transform2D skewing(float skewX, float skewY) {
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Transform2D t;
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t.matrix = glm::mat4(1.0f);
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t.matrix[1][0] = std::tan(skewX * DEG_TO_RAD);
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t.matrix[0][1] = std::tan(skewY * DEG_TO_RAD);
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return t;
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}
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Transform2D operator*(const Transform2D &other) const {
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return Transform2D(matrix * other.matrix);
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}
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Transform2D &operator*=(const Transform2D &other) {
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matrix *= other.matrix;
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return *this;
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}
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Vec2 transformPoint(const Vec2 &p) const {
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glm::vec4 result = matrix * glm::vec4(p.x, p.y, 0.0f, 1.0f);
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return {result.x, result.y};
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}
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Transform2D inverse() const { return Transform2D(glm::inverse(matrix)); }
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};
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// ---------------------------------------------------------------------------
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// 数学工具函数
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// ---------------------------------------------------------------------------
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namespace math {
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inline float clamp(float value, float minVal, float maxVal) {
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return value < minVal ? minVal : (value > maxVal ? maxVal : value);
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}
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inline float lerp(float a, float b, float t) { return a + (b - a) * t; }
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inline float degrees(float radians) { return radians * RAD_TO_DEG; }
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inline float radians(float degrees) { return degrees * DEG_TO_RAD; }
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} // namespace math
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} // namespace extra2d
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