#include <GL/glut.h> #include <stdio.h> #include <cstdlib>void dda_line(int x1, int y1, int x2, int y2) {glPointSize(1.0);glBegin(GL_POINTS);glVertex2i(x1, y1);glVertex2i(x2, y2);// x,y的增量int dx = x2 - x1;int dy = y2 - y1;double dert_x;double dert_y;double x, y;int steps;// 步長，看x和y哪個大if (abs(dx) > abs(dy))steps = abs(dx);elsesteps = abs(dy);// 根據步長，算x和y的增量dert_x = (GLdouble)dx / (GLdouble)steps;dert_y = (GLdouble)dy / (GLdouble)steps;x = x1;y = y1;for (int i = 1; i <= steps; i++) {x += dert_x;y += dert_y;glVertex2f(x, y);}glEnd(); } void myDisplay(void) {glClear(GL_COLOR_BUFFER_BIT);dda_line(250, 250, 350, 450);glFlush(); } int main(int argc, char* argv[]) {glutInit(&argc, argv);glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);glutInitWindowPosition(500, 200);glutInitWindowSize(500, 500);glutCreateWindow("DDA");gluOrtho2D(0.0, 500.0, 0.0, 500.0);glutDisplayFunc(&myDisplay);glutMainLoop();return 0; }

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