1 files changed, 84 insertions, 0 deletions
diff --git a/include/cru/platform/matrix.hpp b/include/cru/platform/matrix.hpp
new file mode 100644
index 00000000..e5e5cf42
--- /dev/null
+++ b/include/cru/platform/matrix.hpp
@@ -0,0 +1,84 @@
+#include "cru/common/pre_config.hpp"
+
+#include "cru/common/ui_base.hpp"
+
+#include <cmath>
+
+namespace cru::platform {
+struct Matrix {
+  float m11;
+  float m12;
+  float m21;
+  float m22;
+  float m31;
+  float m32;
+
+  Matrix() {}
+
+  Matrix(float m11, float m12, float m21, float m22, float m31, float m32) {
+    this->m11 = m11;
+    this->m12 = m12;
+    this->m21 = m21;
+    this->m22 = m22;
+    this->m31 = m31;
+    this->m32 = m32;
+  }
+
+  bool IsIdentity() const {
+    return m11 == 1.0f && m12 == 0.0f && m21 == 0.0f && m22 == 1.0f &&
+           m31 == 0.0f && m32 == 0.0f;
+  }
+
+  Matrix& operator*=(const Matrix& matrix) const {
+    *this = Product(*this, matrix);
+    return *this;
+  }
+
+  Matrix operator*(const Matrix& matrix) const { return Product(this, matrix); }
+
+  ui::Point TransformPoint(const ui::Point& point) const {
+    return ui::Point{point.x * m11 + point.y * m21 + m31,
+                     point.x * m12 + point.y * m22 + m32};
+  }
+
+  static Matrix Identity() {
+    return Matrix{1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f};
+  }
+
+  static Matrix Translation(float x, float y) {
+    return Matrix{1.0f, 0.0f, 0.0f, 1.0f, x, y};
+  }
+
+  static Matrix Scale(float sx, float sy) { return Scale(sx, sy, 0.0f, 0.0f); }
+
+  static Matrix Scale(float sx, float sy, float cx, float cy) {
+    return Matrix{sx, 0.0f, 0.0f, sy, cx - sx * cx, cy - sy * cy};
+  }
+
+  static Matrix Rotation(float angle) {
+    float r = AngleToRadian(angle);
+    float s = std::sinf(r);
+    float c = std::cosf(r);
+
+    return Matrix{c, s, -s, c, 0.0f, 0.0f};
+  }
+
+  static Matrix Skew(float sx, float sy) {
+    return Matrix{1.0f, sx, sy, 1.0f, 0.0f, 0.0f};
+  }
+
+  static Matrix Product(const Matrix& a, const Matrix& b) {
+    return Matrix{a.m11 * b.m11 + a.m12 * b.m21,
+                  a.m11 * b.m12 + a.m12 * b.m22,
+                  a.m21 * b.m11 + a.m22 * b.m21,
+                  a.m21 * b.m12 + a.m22 * b.m22,
+                  a.m31 * b.m11 + a.m32 * b.m21 + b.m31,
+                  a.m31 * b.m12 + a.m32 * b.m22 + b.m32};
+  }
+
+ private:
+  static constexpr float PI = 3.1415926535f;
+
+  static float AngleToRadian(float angle) { return angle / 180.f * PI; }
+};
+}  // namespace cru::platform