直线点画模式

标签：opengl   图形学   

1：开启点画模式：glEnable(GL_LINE_STIPPLE);

2：设置当前模式为点画模式：glLineStipple(1, 0x0101); 

#include <gl/glut.h>
#define drawOneLine(x1,y1,x2,y2) glBegin(GL_LINES);	glVertex2f((x1), (y1)); glVertex2f((x2),(y2)); glEnd();

void init()
{
	glClearColor(0.0, 0.0, 0.0, 0.0);
	glShadeModel(GL_FLAT);
}

void display(void)
{
	int i;
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0, 1.0, 1.0);
	glEnable(GL_LINE_STIPPLE);
	glLineStipple(1, 0x0101);
	drawOneLine(50.0, 125.0, 150.0, 125.0);
	glLineStipple(1, 0x00FF);
	drawOneLine(150,125.0,250.0,125.0);
	glLineStipple(1, 0x1C47);
	drawOneLine(250.0,125.0,350.0,125.0);

	glLineWidth(5.0);
	glLineStipple(1, 0x0101);
	drawOneLine(50.0, 100.0, 150.0, 100.0);
	glLineStipple(1, 0x00FF);
	drawOneLine(150, 100.0, 250.0, 100.0);
	glLineStipple(1, 0x1C47);
	drawOneLine(250.0, 100.0, 350.0, 100.0);
	glLineWidth(1.0);

	glLineStipple(1, 0x1C47);
	glBegin(GL_LINE_STRIP);
	for (int i = 0; i < 7;i++)
	{
		glVertex2f(50.0 + ((GLfloat)i*50.0),75.0);
	}
	glEnd();

	for (int i = 0; i < 6;i++)
	{
		drawOneLine(50.0 + ((GLfloat)i*50.0), 50.0, 50.0 + ((GLfloat)(i+1)*50.0),50.0);
	}

	glLineStipple(5, 0x1C47);
	drawOneLine(50.0,25.0,350.0,25.0);
	glDisable(GL_LINE_STIPPLE);
	glLineStipple(5, 0x1C47);
	drawOneLine(50.0, 10.0, 350.0, 10.0);
	glFlush();
}

void reshape(int w,int h)
{
	glViewport(0, 0,(GLsizei)w,(GLsizei)h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0.0, (GLdouble)w, 0.0, (GLdouble)h);
}
int main(int argc, char** argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(400, 150);
	glutInitWindowPosition(100, 100);
	glutCreateWindow(argv[0]);
	init();
	glutDisplayFunc(display);
	glutReshapeFunc(reshape);
	glutMainLoop();
	return 0;
}

直线点画模式

标签：opengl   图形学   

原文地址：http://blog.csdn.net/ztk881012/article/details/40383935