計算機圖形學畫橢圓和圓VIP

1、計算機圖形學實驗圓、橢圓的中點算法學 院：計算機科學與技術(shù)學院專 業(yè)：軟件工程班 級：軟工 152學 號：1500170408學生姓名：劉強坤學院：計算機科學與技術(shù) 專業(yè)：軟件工程 班級： 軟工152姓名劉強坤學號1500170408實驗組實驗時間10-24指導教師成績實驗項目名稱圓，橢圓中點算法實驗要求優(yōu)化后的算法：二次差分法可任意指定圓心坐標實驗目的實驗環(huán)境VS 2015實驗內(nèi)容圓：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 +

2、yc);while (x < y)if (d < 0)d = d + 4 * x + 6;elsed = 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

3、, x + yc);橢圓：void Ellipsepot(int x0, int y0, int x, int y)/ 1setPixel(x0 + x), (y0 + y);/ 2setPixel(x0 + x), (y0 - y);/ 3setPixel(x0 - x), (y0 - y);/ 4setPixel(x0 - x), (y0 + y);/中點畫橢圓算法void MidPoint_Ellipse(int x0, int y0, int a, int b)double sqa = a*a;double sqb = b*b;double d = sqb + sqa*(0.25 -

4、b);int x = 0;int y = b;Ellipsepot(x0, y0, x, y);/ 1while (sqb*(x + 1) < sqa*(y - 0.5)if (d < 0)d += sqb*(2 * x + 3);elsed += (sqb*(2 * x + 3) + sqa*(-2)*y + 2);-y;+x;Ellipsepot(x0, y0, x, y);d = (b * (x + 0.5) * 2 + (a * (y - 1) * 2 - (a * b) * 2;/ 2while (y > 0)if (d < 0)d += sqb * (2 * x + 2) + sqa * (-2) * y + 3);+x;elsed += sqa * (-2) * y + 3);-y;Ellipsepot(x0, y0, x