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用鼠标左键按下确定直线起点，鼠标左键抬起确定直线终点。放一部分代码。

// 中点Bresenham算法.cpp : 定义控制台应用程序的入口点。
//#include "stdafx.h"
#include <GL/glut.h>
#include <iostream>
#include <cmath>int windowWidth = 800;
int windowHeight = 600;int startX, startY, endX, endY;
bool isDrawing = false;void setPixel(int x, int y, float r, float g, float b) {glColor3f(r, g, b);glPointSize(5);//设置点的大小glBegin(GL_POINTS);glVertex2i(x, y);glEnd();
}void drawLine(int x0, int y0, int x1, int y1, float r0, float g0, float b0, float r1, float g1, float b1) {}void display() {glClear(GL_COLOR_BUFFER_BIT);glFlush();
}void mouse(int button, int state, int x, int y) {}int main(int argc, char** argv) {glutInit(&argc, argv);glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);glutInitWindowSize(windowWidth, windowHeight);glutCreateWindow("Color Gradient Line Drawing");glClearColor(0.0, 0.0, 0.0, 1.0);gluOrtho2D(0, windowWidth, 0, windowHeight);glutDisplayFunc(display);glutMouseFunc(mouse);glutMainLoop();return 0;
}