测试矩阵相乘

#include <QtWidgets/QApplication>  
#include <QtWidgets/QGraphicsScene>  
#include <QtWidgets/QGraphicsView>  
#include <QtCore/QPointF>  
#include <QtCore/QDebug>  
  
// 定义矩阵类  
class Matrix {  
public:  
    Matrix(float m00, float m01, float m02, float m10, float m11, float m12) :  
            m00(m00), m01(m01), m02(m02),  
            m10(m10), m11(m11), m12(m12) {}  
  
    float operator()(float x, float y) const {  
        return m00 + m01 * x + m02 * y;  
    }  
  
private:  
    float m00, m01, m02;  
    float m10, m11, m12;  
};  
  
int main(int argc, char *argv[]) {  
    QApplication a(argc, argv);  
  
    // 创建场景和视图  
    QGraphicsScene scene(400, 400);  
    QGraphicsView view(&scene);  
  
    // 定义矩阵A和矩阵B  
    Matrix matrixA(1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f);  
    Matrix matrixB(7.0f, 8.0f, 9.0f, 10.0f, 11.0f, 12.0f);  
  
    // 计算矩阵C = matrixA * matrixB  
    Matrix matrixC(matrixA(0, 0), matrixA(0, 1), matrixA(0, 2),  
                  matrixA(1, 0), matrixA(1, 1), matrixA(1, 2),  
                  matrixA(2, 0), matrixA(2, 1), matrixA(2, 2));  
  
    // 绘制矩阵C  
    view.scene().addTransformedShape(&matrixC);  
  
    // 显示场景  
    view.show();  
  
    return a.exec();  
}