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Diffstat (limited to 'src/libjin/Math/je_matrix.h')
| -rw-r--r-- | src/libjin/Math/je_matrix.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/src/libjin/Math/je_matrix.h b/src/libjin/Math/je_matrix.h new file mode 100644 index 0000000..1fe6ab1 --- /dev/null +++ b/src/libjin/Math/je_matrix.h @@ -0,0 +1,159 @@ +#ifndef __LIBJIN_MATRIX_H +#define __LIBJIN_MATRIX_H + +namespace jin +{ + namespace math + { + + struct vertex + { + unsigned char r, g, b, a; + float x, y; + float s, t; + }; + /** + * This class is the basis for all transformations in LOVE. Althought not + * really needed for 2D, it contains 4x4 elements to be compatible with + * OpenGL without conversions. + * Ҫתõľ + * https://blog.csdn.net/candycat1992/article/details/8830894 + **/ + class Matrix + { + private: + + /** + * | e0 e4 e8 e12 | + * | e1 e5 e9 e13 | + * | e2 e6 e10 e14 | + * | e3 e7 e11 e15 | + **/ + float e[16]; + + public: + + static const Matrix Identity; + + /** + * Creates a new identity matrix. + **/ + Matrix(); + + /** + * Destructor. + **/ + ~Matrix(); + + void setOrtho(float _left, float _right, float _bottom, float _top, float _near, float _far); + + /** + * Multiplies this Matrix with another Matrix, changing neither. + * @param m The Matrix to multiply with this Matrix. + * @return The combined matrix. + **/ + Matrix operator * (const Matrix & m) const; + + /** + * Multiplies a Matrix into this Matrix. + * @param m The Matrix to combine into this Matrix. + **/ + void operator *= (const Matrix & m); + + /** + * Gets a pointer to the 16 array elements. + * @return The array elements. + **/ + const float * getElements() const; + + /** + * Resets this Matrix to the identity matrix. + **/ + void setIdentity(); + + /** + * Resets this Matrix to a translation. + * @param x Translation along x-axis. + * @param y Translation along y-axis. + **/ + void setTranslation(float x, float y); + + /** + * Resets this Matrix to a rotation. + * @param r The angle in radians. + **/ + void setRotation(float r); + + /** + * Resets this Matrix to a scale transformation. + * @param sx Scale factor along the x-axis. + * @param sy Scale factor along the y-axis. + **/ + void setScale(float sx, float sy); + + /** + * Resets this Matrix to a shear transformation. + * @param kx Shear along x-axis. + * @param ky Shear along y-axis. + **/ + void setShear(float kx, float ky); + + /** + * Creates a transformation with a certain position, orientation, scale + * and offset. Perfect for Drawables -- what a coincidence! + * + * @param x The translation along the x-axis. + * @param y The translation along the y-axis. + * @param angle The rotation (rad) around the center with offset (ox,oy). + * @param sx Scale along x-axis. + * @param sy Scale along y-axis. + * @param ox The offset for rotation along the x-axis. + * @param oy The offset for rotation along the y-axis. + * @param kx Shear along x-axis + * @param ky Shear along y-axis + **/ + void setTransformation(float x, float y, float angle, float sx, float sy, float ox, float oy); + + /** + * Multiplies this Matrix with a translation. + * @param x Translation along x-axis. + * @param y Translation along y-axis. + **/ + void translate(float x, float y); + + /** + * Multiplies this Matrix with a rotation. + * @param r Angle in radians. + **/ + void rotate(float r); + + /** + * Multiplies this Matrix with a scale transformation. + * @param sx Scale factor along the x-axis. + * @param sy Scale factor along the y-axis. + **/ + void scale(float sx, float sy); + + /** + * Multiplies this Matrix with a shear transformation. + * @param kx Shear along the x-axis. + * @param ky Shear along the y-axis. + **/ + void shear(float kx, float ky); + + /** + * Transforms an array of vertices by this Matrix. The sources and + * destination arrays may be the same. + * + * @param dst Storage for the transformed vertices. + * @param src The source vertices. + * @param size The number of vertices. + **/ + void transform(vertex * dst, const vertex * src, int size) const; + + }; + + } // namespace math +} // namespace jin + +#endif
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