实验2 圆形和椭圆的生成

最新推荐文章于 2025-04-28 07:10:09 发布

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最新推荐文章于 2025-04-28 07:10:09 发布

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分类专栏：计算机图形学文章标签： c++

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#include <windows.h>
#include <GL/glut.h>

void init(int argc, char** argv) {
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); 
	glutInitWindowPosition(50,100);
	glutInitWindowSize(400,400);
	glutCreateWindow("Bresenham"); 
	glClearColor(1.0,1.0, 1.0, 0);
	glMatrixMode(GL_PROJECTION); 
	gluOrtho2D(0,400,0,400);
}

void Bresenham_Circle(int xc, int yc, int r) {
	int x, y, d;
	x = 0;
	y = r;
	d = 3 - 2 * r;
	glVertex2i(x + xc, y + yc);
	while (x < y)
	{
		if (d < 0)
		{
			d = d + 4 * x + 6;
		}
		else
		{
			d = d + 4 * (x - y) + 10;
			y--;
		}
		x++;
		glVertex2i(x + xc, y + yc);
		glVertex2i(y + xc,x + yc);
		glVertex2i(y + xc, -x + yc);
		glVertex2i(x + xc, -y + yc);
		glVertex2i(-x + xc, - y + yc);
		glVertex2i(-y + xc, - x + yc);
		glVertex2i(-x + xc, y + yc); 
		glVertex2i(-y + xc, x + yc);

	}
}

void myDisplay(void) {
	glClear(GL_COLOR_BUFFER_BIT); 
	glColor3f(0.0,0.4,0.2); 
	glPointSize(2);
	glBegin(GL_POINTS);
	Bresenham_Circle(200,200,50); 
	glEnd();
	glFlush();
}

int main(int argc, char** argv) {
	init(argc, argv);
	glutDisplayFunc(myDisplay);
	glutMainLoop();
	return 0;
}

结果图