计算机图形学设计线宽代码,计算机图形学画圆并改变线宽.pdf

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(;x<=y;x++)

{

pDC->SetPixel(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(255,0,0));

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<=r+width;x++)

{

for(y=r+width;y>=0;y--)

{

if((x)*(x)+(y)*(y)>=r*r &&

(x)*(x)+(y)*(y)<=(r+width)*(r+width))

{

pDC->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

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(d<0)

{

d+=2*x+3;

}

else

{