80 lines
1.7 KiB
C++
80 lines
1.7 KiB
C++
#include <cmath>
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#include <iostream>
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#include <GL/glut.h>
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// 窗口宽度和高度
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const int WIDTH = 640;
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const int HEIGHT = 480;
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void drawDDALine(int x1, int y1, int x2, int y2) {
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float x = x1;
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float y = y1;
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// 计算差值
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int dx = x2 - x1;
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int dy = y2 - y1;
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// 确定步数，取 dx 和 dy 中绝对值较大的那个
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int steps = std::abs(dx) > std::abs(dy) ? std::abs(dx) : std::abs(dy);
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// 计算每一步的增量
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float xIncrement = (float)dx / steps;
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float yIncrement = (float)dy / steps;
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// 开始绘制点
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glBegin(GL_POINTS);
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glVertex2i((int)round(x), (int)round(y)); // 绘制起点
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for (int k = 0; k < steps; k++) {
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x += xIncrement;
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y += yIncrement;
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// 将浮点坐标四舍五入转换为整数像素坐标
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std::cout << (int)round(x) << ", " << (int)round(y)<<"\n";
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glVertex2i((int)round(x), (int)round(y));
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}
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glEnd();
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}
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// 显示回调函数
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void display() {
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drawDDALine(0, 0, 50, 20);
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glFlush();
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}
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// 初始化 OpenGL 设置
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void init() {
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// 设置背景颜色为白色
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glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
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// 设置投影矩阵为 2D 正交投影
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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// 定义可视区域，左下角(0,0)，右上角(WIDTH, HEIGHT)
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gluOrtho2D(0.0, WIDTH, 0.0, HEIGHT);
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}
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int main(int argc, char** argv) {
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// 初始化 GLUT
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glutInit(&argc, argv);
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// 设置显示模式：单缓冲、RGB 颜色模式
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glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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// 设置窗口大小和位置
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glutInitWindowSize(WIDTH, HEIGHT);
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glutInitWindowPosition(100, 100);
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// 创建窗口
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glutCreateWindow("DDA算法");
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// 注册回调函数
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glutDisplayFunc(display);
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// 初始化设置
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init();
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// 进入主循环
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glutMainLoop();
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return 0;
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} |