scanline.cpp

经典算法实现

#include <stdlib.h> 
#include <stdio.h> 
#include <GL/glut.h> 
#include "Scan.h" 

void myInit(); 

void setPixel(int x, int y); 

void myDisplay(); 

int main(int argc, char **argv) { 
	glutInit(&argc, argv); 
	glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); 
	glutInitWindowSize(640, 480); 
	glutInitWindowPosition (100, 150); 
	glutCreateWindow("SweepLine"); 
	glutDisplayFunc(myDisplay); 
	myInit(); 
	glutMainLoop(); 
	return 0; 
} 


void setPixel(int x, int y) { 
	glBegin(GL_POINTS); 
	glVertex2i(x, y); 
	glEnd(); 
} 

void myInit() { 
	glClearColor(1.0, 1.0, 1.0, 0.0); 
	glColor3f(0.0, 0.0, 0.0); 
	glMatrixMode(GL_PROJECTION); 
	glLoadIdentity(); 
	gluOrtho2D(0.0, 640.0, 0.0, 480.0); 
} 


void myDisplay() { 
	int i, j; 
	glClear(GL_COLOR_BUFFER_BIT); 
	int p[5][2]; 
	p[0][0] = 100; p[0][1] = 300; 
	p[1][0] = 200; p[1][1] = 50; 
	p[2][0] = 300; p[2][1] = 100; 
	p[3][0] = 400; p[3][1] = 0; 
	p[4][0] = 350; p[4][1] = 470; 
	sweep(p, 5, setPixel); 
	glFlush(); 
}