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  • 大小: 2KB
    文件類型: .cpp
    金幣: 1
    下載: 0 次
    發布日期: 2021-05-17
  • 語言: C/C++
  • 標簽: Bresenham??

資源簡介

采用完全Bresenham算法生成橢圓，有別于中點Bresenham算法生成橢圓

資源截圖

代碼片段和文件信息 


#include?
#include?

void?drawEllipse?（int?a?int?b?int?xLoc?int?yLoc）?
{?
??????glPushMatrix?（）;?
?????int?x?y;?
?????float?p1?p2?aa?bb;?
?????aa?=?a?*?a;?
?????bb?=?b?*?b;?
?????p1?=?-2*b+1;?
?????glTranslatef?（（GLfloat）?xLoc?（GLfloat）?yLoc?0.0f）;?
?????x?=?0;??
?????y?=?b;?
?????glBegin?（GL_POINTS）;?
?????glVertex2i?（?x??y）;?
?????glVertex2i?（-x??y）;?
?????glVertex2i?（-x?-y）;?
?????glVertex2i?（?x?-y）;?
?????while?（bb*x?????{???
?????????if?（p1?<=0）?
?????????{?p1+=（2*bb*（2*x+1））/a*a;
		??
????????
?????????}?
?????????else
?????????????{?p1+=2*bb*（2*x+1）/a*a+2*（-2*y+1）+2;
		??????
????????????
?????????????--?y;?
?????????????}?
?????????++?x;?
?????????glVertex2i?（?x??y）;?
?????????glVertex2i?（-x??y）;?
?????????glVertex2i?（-x?-y）;?
?????????glVertex2i?（?x?-y）;?
?????}?


?????p2?=?2*y*y-2*y-2*（aa*bb-bb*x*x）/aa+1;//2*x*x+2*x-2*（aa*bb-aa*（y-1）*（y-1））/bb+1;?
?????while?（y>0）?
?????{????
??????????if?（p2?<=?0）?
??????????{?
?????????????++?x;?
?????????????p2+=2*aa*（-2*y+1）/bb+2*（2*x+1）+2;?
			?
??????????}?
??????????else
??????????{
?????????????p2+=2*aa*（-2*y+1）/bb;?
			?
	
??????????}?
??????????--?y;?
??????????glVertex2i?（?x??y）;?

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