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1、Bresenham画圆法改变线宽(红色为添加代码部分)void BresenhamCircle(int R,CDC *pDC){ int x0,y0,x,y,p; x0=100; y0=100; x = x0; y=y0 + R; p=3-2*R; for(;xSetPixel(x,y,RGB(255,0,0)); pDC->SetPixel(x,2*y0-y,RGB(255,0,0)); pDC->SetPixel(y,x,RGB(255,0,0)); pDC->SetPixel(2*y0-y,x,RGB(255,0,0)); pDC->SetPixel(2*x0-x,y,RGB(255,0,0)); pDC->SetPixel(y,2*x0-x,RGB(255,0,0)); pDC->SetPixel(2*x0-x,2*y0-y,RGB(255,0。

2、,0)); pDC->SetPixel(2*y0-y,2*x0-x,RGB(255,0,0)); if(p>=0) { p+=4*(x-y)+10; y--; } else { p+=4*(x-x0)+6; } }}void RasterScanFillCircle(CDC *pDC, int x0, int y0, int r, int width, int color){int x, y;for(x=0;x=0;y--){if((x)*(x)+(y)*(y)>=r*r && (x)*(x)+(y)*(y)SetPixel(x+x0,y+y0,color); pDC->SetPixel(x0-x,y+y0,color); pDC->SetPixel(x0-x,y0-y,color); pDC->SetPixel(x+x0,y0-y,color);}}}。

3、}void CCircleView::OnDraw(CDC* pDC){ CCircleDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); // TODO: add draw code for native data here BresenhamCircle(50,pDC); RasterScanFillCircle(pDC,300,100,50,5,RGB(255,0,0));} 中点画圆法改变线宽void MidpointCircle(CDC *pdc,int x0,int y0,int r,int color) { int x,y; float d; x=0; y=r; d=1.25-r; pdc->SetPixel(x0+x,y0-y,color); while(x<=y) { x++; if(dSetPixel(x0+x,y0。

4、-y,color); pdc->SetPixel(x0-x,y0-y,color); pdc->SetPixel(x0+x,y0+y,color); pdc->SetPixel(x0-x,y0+y,color); pdc->SetPixel(x0+y,y0-x,color); pdc->SetPixel(x0-y,y0-x,color); pdc->SetPixel(x0+y,y0+x,color); pdc->SetPixel(x0-y,y0+x,color); } } void RasterScanFillCircle(CDC *pDC, int x0, int y0, int r, int width, int color){int x, y;for(x=0;x=0;y--){if((x)*(x)+(y)*(y)>=r*r && (x)。

5、*(x)+(y)*(y)SetPixel(x+x0,y+y0,color); pDC->SetPixel(x0-x,y+y0,color); pDC->SetPixel(x0-x,y0-y,color); pDC->SetPixel(x+x0,y0-y,color);}}}}void CCircleView::OnDraw(CDC* pDC){ CCircleDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); // TODO: add draw code for native data here int x0,y0; x0=100,y0=100; int r=80; int color=RGB(255,0,255); CClientDC dc(this); MidpointCircle(&dc,x0,y0,r,color);RasterScanFillCircle(pDC,300,100,80,5,RGB(255,0,0));}。