计算机图形学图形二维变换基于vsual C++实现代码

下面是一个简单的 Visual C++ 代码示例，演示了如何实现二维图形变换（平移、旋转、缩放）：

#include <iostream>
#include <graphics.h>
#include <cmath>

using namespace std;

int main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "");

    // 画一个矩形
    rectangle(100, 100, 200, 200);

    // 平移
    int tx = 50, ty = 50;
    setcolor(RED);
    rectangle(100+tx, 100+ty, 200+tx, 200+ty);

    // 旋转
    setcolor(GREEN);
    int cx = 150, cy = 150;
    double angle = 45.0;
    double radians = angle * M_PI / 180.0;
    int x1 = (100-cx)*cos(radians) - (100-cy)*sin(radians) + cx;
    int y1 = (100-cx)*sin(radians) + (100-cy)*cos(radians) + cy;
    int x2 = (200-cx)*cos(radians) - (100-cy)*sin(radians) + cx;
    int y2 = (200-cx)*sin(radians) + (100-cy)*cos(radians) + cy;
    int x3 = (200-cx)*cos(radians) - (200-cy)*sin(radians) + cx;
    int y3 = (200-cx)*sin(radians) + (200-cy)*cos(radians) + cy;
    int x4 = (100-cx)*cos(radians) - (200-cy)*sin(radians) + cx;
    int y4 = (100-cx)*sin(radians) + (200-cy)*cos(radians) + cy;
    rectangle(x1, y1, x3, y3);

    // 缩放
    setcolor(BLUE);
    double sx = 1.5, sy = 0.5;
    x1 = 100*sx, y1 = 100*sy;
    x2 = 200*sx, y2 = 100*sy;
    x3 = 200*sx, y3 = 200*sy;
    x4 = 100*sx, y4 = 200*sy;
    rectangle(x1, y1, x3, y3);

    getch();
    closegraph();

    return 0;
}

注意，此代码使用了 `graphics.h` 头文件和 BGI 图形库，因此需要在编译和运行时设置正确的库路径和链接选项。此外，该示例只演示了如何进行简单的二维变换，实际应用中需要考虑更多的变换类型和复杂性。