⭐ 欢迎来到虫虫下载站！ | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站
📤 上传资源

📄 draw4view.cpp

📁 计算机图形学
💻 CPP
📖 第 1 页 / 共 3 页
字号:
🔍
123 
		pDC->SetPixel(x + x0,y + y0,color);
	    pDC->SetPixel(-x + x0,y + y0,color);
	   // pDC->SetPixel(-x + x0,-y + y0,color);
	    //pDC->SetPixel(x + x0,-y + y0,color);
		}

	}
	x = a;
	y = 0;
	d = 4*(sa - sb*a) + sb;

	if(y+y0>212)
	{
	pDC->SetPixel(x + x0,y + y0,color);
	pDC->SetPixel(-x + x0,y + y0,color);
	//pDC->SetPixel(-x + x0,-y + y0,color);
	//pDC->SetPixel(x + x0,-y + y0,color);
	}

	while(y <= yP)
	{
		if(d <= 0)
			d += 4*sa*(2*y + 3);
		else
		{
			d += 4*sa*(2*y + 3) - 8*sb*(x - 1);
			x --;
		}
		y ++;

	    if(y+y0>212)
		{
		pDC->SetPixel(x + x0,y + y0,color);
	    pDC->SetPixel(-x + x0,y + y0,color);
	    //pDC->SetPixel(-x + x0,-y + y0,color);
	    //pDC->SetPixel(x + x0,-y + y0,color);
		}

	}

}

void CDraw4View::Draw13(int x0, int x1, int y0, int y1)
{
	int dx,dy,dxy,s1,s2,flag,i,d,x,y,color = 0;
	CDC* pDC = GetDC();

	x = x0;
	y = y0;
	dx = abs(x1 - x0);
	dy = abs(y1 - y0);
	s1 = (x1 - x0) > 0 ? 1:-1;
	s2 = (y1 - y0) > 0 ? 1:-1;
	if(dy > dx)
	{
		dxy = dx;dx = dy;dy = dxy;
		flag = 1;
	}
	else
		flag = 0;
	d = 2*dy - dx;
	for(i = 1;i <= dx;i++)
	{
		pDC->SetPixel(x,y,color);
        while(d >= 0)
            {
                if(flag == 1)
                    x += s1;
                else
                    y += s2;
                d += -2*dx;
			}
            if(flag == 1)
				y += s2;
			else
				x += s1;
			d += 2*dy;
	}
		
}



void CDraw4View::DisplaySquareBezier(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3, int m)
{//三次Bezier曲线
	float C[2][4],t,dx,Newx,Newy;
	int Vx,Vy,Nx,Ny,i,j;
	
	C[0][0]=x0;
	C[0][1]=-3*x0+3*x1;
	C[0][2]=3*x0-6*x1+3*x2;
	C[0][3]=-1*x0+3*x1-3*x2+x3;
    C[1][0]=y0;
	C[1][1]=-3*y0+3*y1;
	C[1][2]=3*y0-6*y1+3*y2;
	C[1][3]=-1*y0+3*y1-3*y2+y3;

	Vx=x0,Vy=y0;
	dx=1.0/m,t=0.0;
	for(i=1;i<=m;i++)
	{t+=dx;
	 Newx=C[0][0]+t*(C[0][1]+t*(C[0][2]+t*C[0][3]));
	 Newy=C[1][0]+t*(C[1][1]+t*(C[1][2]+t*C[1][3]));
	 Nx=(int)(Newx+0.5),Ny=(int)(Newy+0.5);
	 LineDDA1(Vx,Vy,Nx,Ny);
	 Vx=Nx,Vy=Ny;
	}
	
}

void CDraw4View::LineDDA1(int x0, int y0, int x1, int y1)
{int x,color = 0;
 float dy,dx,y,m,t;
 CDC*pDC=GetDC();
 if(x0==x1)                             /*斜率不存在的情形*/
    {if(y0>y1)
       {t=y0;y0=y1;y1=t;}                     /*使得y0<y1*/
     for(x=x0,y=y0;y<y1;y++)
	 {
		 pDC->SetPixel(x+272+100,y-5+13,color);
		 pDC->SetPixel(342-y+100,x+9+13,color);
		 pDC->SetPixel(-x+328+100,-y+79+13,color);
		 pDC->SetPixel(y+258+100,-x+65+13,color);
	 }
    }
 else                                      /*有斜率的情形*/
 {
      dx=x1-x0;
      dy=y1-y0;
      m=dy/dx;     
      y=y0;  	  /*计算斜率值*/
      if(x0>x1)
    {
		t=x0;x0=x1,y=y1;x1=t;
	}                  /*使得x0<x1*/
    for(x=x0;x<=x1;x++)
        {
            pDC->SetPixel(x+272+100,(int)(y-5+0.5)+13,color);
			pDC->SetPixel((int)(-y+342+0.5)+100,x+9+13,color);
			pDC->SetPixel(-x+328+100,(int)(-y+79+0.5)+13,color);
			pDC->SetPixel((int)(y+258+0.5)+100,-x+65+13,color);

            y+=m;
		}
 }
}


void CDraw4View::LineDDA2(int x0, int y0, int x1, int y1)
{int x,color = 0;
 float dy,dx,y,m,t;
 CDC*pDC=GetDC();
 if(x0==x1)                             /*斜率不存在的情形*/
    {if(y0>y1)
       {t=y0;y0=y1;y1=t;}                     /*使得y0<y1*/
     for(x=x0,y=y0;y<y1;y++)
	 {
		 if(y<463)
		 {
		 pDC->SetPixel(x+20,y,color);
		 }
	 }
    }
 else                                      /*有斜率的情形*/
 {
      dx=x1-x0;
      dy=y1-y0;
      m=dy/dx;     
      y=y0;  	  /*计算斜率值*/
      if(x0>x1)
    {
		t=x0;x0=x1,y=y1;x1=t;
	}                  /*使得x0<x1*/
    for(x=x0;x<=x1;x++)
        {
		   if(y<463)
           {
            pDC->SetPixel(x+20,(int)(y+0.5),color);
		   }
            y+=m;
		}
 }
}

void CDraw4View::DisplaySquareBezier2(int x0, int y0, int x1, int y1, int x2, int y2, int m)
{//三次Bezier曲线
	float C[2][3],t,dx,Newx,Newy;
	int Vx,Vy,Nx,Ny,i,j;
	
	C[0][0]=x0;
	C[0][1]=-3*x0+3*x1;
	C[0][2]=3*x0-6*x1+3*x2;
    C[1][0]=y0;
	C[1][1]=-3*y0+3*y1;
	C[1][2]=3*y0-6*y1+3*y2;

	Vx=x0,Vy=y0;
	dx=1.0/m,t=0.0;
	for(i=1;i<=m;i++)
	{t+=dx;
	 Newx=C[0][0]+t*(C[0][1]+t*(C[0][2]));
	 Newy=C[1][0]+t*(C[1][1]+t*(C[1][2]));
	 Nx=(int)(Newx+0.5),Ny=(int)(Newy+0.5);
	 LineDDA2(Vx,Vy,Nx,Ny);
	 Vx=Nx,Vy=Ny;
	}
	
}


void CDraw4View::LineDDA3(int x0, int y0, int x1, int y1)
{int x,color = 0;
 float dy,dx,y,m,t;
 CDC*pDC=GetDC();
 if(x0==x1)                             /*斜率不存在的情形*/
    {if(y0>y1)
       {t=y0;y0=y1;y1=t;}                     /*使得y0<y1*/
     for(x=x0,y=y0;y<y1;y++)
	 {
		 if(y<450)
		 {
		 pDC->SetPixel(x-20,y,color);
		 }
	 }
    }
 else                                      /*有斜率的情形*/
 {
      dx=x1-x0;
      dy=y1-y0;
      m=dy/dx;     
      y=y0;  	  /*计算斜率值*/
      if(x0>x1)
    {
		t=x0;x0=x1,y=y1;x1=t;
	}                  /*使得x0<x1*/
    for(x=x0;x<=x1;x++)
        {
		   if(y<450)
           {
            pDC->SetPixel(x-20,(int)(y+0.5),color);
		   }
            y+=m;
		}
 }
}

void CDraw4View::DisplaySquareBezier3(int x0, int y0, int x1, int y1, int x2, int y2, int m)
{//三次Bezier曲线
	float C[2][3],t,dx,Newx,Newy;
	int Vx,Vy,Nx,Ny,i,j;
	
	C[0][0]=x0;
	C[0][1]=-3*x0+3*x1;
	C[0][2]=3*x0-6*x1+3*x2;
    C[1][0]=y0;
	C[1][1]=-3*y0+3*y1;
	C[1][2]=3*y0-6*y1+3*y2;

	Vx=x0,Vy=y0;
	dx=1.0/m,t=0.0;
	for(i=1;i<=m;i++)
	{t+=dx;
	 Newx=C[0][0]+t*(C[0][1]+t*(C[0][2]));
	 Newy=C[1][0]+t*(C[1][1]+t*(C[1][2]));
	 Nx=(int)(Newx+0.5),Ny=(int)(Newy+0.5);
	 LineDDA3(Vx,Vy,Nx,Ny);
	 Vx=Nx,Vy=Ny;
	}
	
}



void CDraw4View::Draw14(int a, int b)
{
	int x,y,d,xP,yP,sa,sb,color = 0;
	int x0 = 300,y0 = 210;
	CDC* pDC = GetDC();

	sa = a*a;sb = b*b;
	xP = (int)(0.5 + (float)sa/sqrt((float)(sa + sb)));
	yP = (int)(0.5 + (float)sb/sqrt((float)(sa + sb)));
	x = 0;
	y = b;
	d = 4*(sb - sa*b) + sa;

	if(y+y0>269)
	{
	pDC->SetPixel(x + x0,y + y0,color);
	pDC->SetPixel(-x + x0,y + y0,color);
	//pDC->SetPixel(-x + x0,-y + y0,color);
	//pDC->SetPixel(x + x0,-y + y0,color);
	}

	while(x <= xP)
	{
		if(d <= 0)
			d += 4*sb*(2*x + 3);
		else
		{
			d += 4*sb*(2*x + 3) - 8*sa*(y - 1);
			y --;
		}
		x ++;

	    if(y+y0>269)
		{
		pDC->SetPixel(x + x0,y + y0,color);
	    pDC->SetPixel(-x + x0,y + y0,color);
	    //pDC->SetPixel(-x + x0,-y + y0,color);
	    //pDC->SetPixel(x + x0,-y + y0,color);
		}

	}
	x = a;
	y = 0;
	d = 4*(sa - sb*a) + sb;

	if(y+y0>269)
	{
	pDC->SetPixel(x + x0,y + y0,color);
	pDC->SetPixel(-x + x0,y + y0,color);
	//pDC->SetPixel(-x + x0,-y + y0,color);
	//pDC->SetPixel(x + x0,-y + y0,color);
	}

	while(y <= yP)
	{
		if(d <= 0)
			d += 4*sa*(2*y + 3);
		else
		{
			d += 4*sa*(2*y + 3) - 8*sb*(x - 1);
			x --;
		}
		y ++;

	    if(y+y0>269)
		{
		pDC->SetPixel(x + x0,y + y0,color);
	    pDC->SetPixel(-x + x0,y + y0,color);
	    //pDC->SetPixel(-x + x0,-y + y0,color);
	    //pDC->SetPixel(x + x0,-y + y0,color);
		}

	}

}


void CDraw4View::DisplaySquareBezier4(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3, int m)
{//三次Bezier曲线
	float C[2][4],t,dx,Newx,Newy;
	int Vx,Vy,Nx,Ny,i,j;
	
	C[0][0]=x0;
	C[0][1]=-3*x0+3*x1;
	C[0][2]=3*x0-6*x1+3*x2;
	C[0][3]=-1*x0+3*x1-3*x2+x3;
    C[1][0]=y0;
	C[1][1]=-3*y0+3*y1;
	C[1][2]=3*y0-6*y1+3*y2;
	C[1][3]=-1*y0+3*y1-3*y2+y3;

	Vx=x0,Vy=y0;
	dx=1.0/m,t=0.0;
	for(i=1;i<=m;i++)
	{t+=dx;
	 Newx=C[0][0]+t*(C[0][1]+t*(C[0][2]+t*C[0][3]));
	 Newy=C[1][0]+t*(C[1][1]+t*(C[1][2]+t*C[1][3]));
	 Nx=(int)(Newx+0.5),Ny=(int)(Newy+0.5);
	 LineDDA4(Vx,Vy,Nx,Ny);
	 Vx=Nx,Vy=Ny;
	}
	
}

void CDraw4View::LineDDA4(int x0, int y0, int x1, int y1)
{int x,color = 0;
 float dy,dx,y,m,t;
 CDC*pDC=GetDC();
 if(x0==x1)                             /*斜率不存在的情形*/
    {if(y0>y1)
       {t=y0;y0=y1;y1=t;}                     /*使得y0<y1*/
     for(x=x0,y=y0;y<y1;y++)
	 {
		 pDC->SetPixel(x+272,y-5,color);

	 }
    }
 else                                      /*有斜率的情形*/
 {
      dx=x1-x0;
      dy=y1-y0;
      m=dy/dx;     
      y=y0;  	  /*计算斜率值*/
      if(x0>x1)
    {
		t=x0;x0=x1,y=y1;x1=t;
	}                  /*使得x0<x1*/
    for(x=x0;x<=x1;x++)
        {
            pDC->SetPixel(x+272,(int)(y-5+0.5),color);
            y+=m;
		}
 }
}

void CDraw4View::drawmat(char *mat,int matsize,int x,int y,int color)
/*依次：字模指针、点阵大小、起始坐标(x,y)、颜色*/
{
	CDC *pDC = GetDC();
	int i,j,k,n;
    n=(matsize-1)/8+1;
    for(j=0;j<matsize;j++)
        for(i=0;i<n;i++)
            for(k=0;k<8;k++)
                if(mat[j*n+i]&(0x80>>k))  /*测试为1的位则显示*/
					pDC->SetPixel(x+i*8+k,y+j,color);
}

void CDraw4View::Scan(CPoint point, int oldColor, int newColor)
{
	int i;
    i=point.x;
	CDC* pDC=GetDC();
	while(pDC->GetPixel(point)==oldColor)
	{pDC->SetPixel(point,newColor);
	 point.x++;
	}
	span.xRight=point.x-1;
	point.x=i-1;
	while(pDC->GetPixel(point)==oldColor)
	{pDC->SetPixel(point,newColor);
	 point.x--;
	}
	span.xLeft=point.x+1;
	span.y=point.y;
}

void CDraw4View::ScanNext(int oldColor, int newColor)
{
	int i,xLeft,xRight,y;
	bool isScan=FALSE;
	CPoint point;
	xLeft=span.xLeft;xRight=span.xRight;
	y=span.y;
	CDC* pDC=GetDC();
    for(i=xLeft;i<=xRight;i++)
	{if(pDC->GetPixel(i,y+1)==oldColor)
	 {isScan=TRUE;
	  point.x=i;point.y=y+1;
	  Scan(point, oldColor, newColor);
	 }
	 if(isScan)
         ScanNext(oldColor,newColor);
	 isScan=FALSE;
	 if(pDC->GetPixel(i,y-1)==oldColor)
	 {isScan=TRUE;
	  point.x=i;point.y=y-1;
	  Scan(point, oldColor, newColor);
	 }
     if(isScan)
		 ScanNext(oldColor,newColor);
	}
}

void CDraw4View::Fill(CPoint point, int oldColor, int newColor)
{
	Scan(point,oldColor,newColor);
	ScanNext(oldColor,newColor);
}


void CDraw4View::Intersect(Vertex * s, Vertex * p, Edge clipBoundary, Vertex * I)
//求多边形的边SP与裁剪边的交点I
{
	if(clipBoundary[0].y==clipBoundary[1].y)     /*水平裁剪边*/
	{
		I->y=clipBoundary[0].y;
		I->x=s->x+(clipBoundary[0].y-s->y)*(p->x-s->x)/(p->y-s->y);
	}
	else                                         /*竖直裁剪边*/
	{
        I->x=clipBoundary[0].x;
		I->y=s->y+(clipBoundary[0].x-s->x)*(p->y-s->y)/(p->x-s->x);
	}
}

bool CDraw4View::Inside(Vertex * testVertex, Edge clipBoundary)
{
	if(clipBoundary[1].x>clipBoundary[0].x)      /*裁剪边为窗口的下边*/
	{    if(testVertex->y>=clipBoundary[0].y)
	     return true;
	}
	else if(clipBoundary[1].x<clipBoundary[0].x)  /*裁剪边为窗口的上边*/
	{
		if(testVertex->y<=clipBoundary[0].y)
			return true;
	}
    else if(clipBoundary[1].y>clipBoundary[0].y)  /*裁剪边为窗口的右边*/
	{
		if(testVertex->x<=clipBoundary[0].x)
			return true;
	}
    else if(clipBoundary[1].y<clipBoundary[0].y)  /*裁剪边为窗口的左边*/
	{
		if(testVertex->x>=clipBoundary[0].x)
			return true;
	}
	return false;
}/*程序Inside()结束*/

void CDraw4View::Output(Vertex * newVertex, int * outLength, VertexArray outVertexArray)
/*将new Vertex加入到结果多边形顶点表outVertexArray*/
{
	outVertexArray[* outLength].x=newVertex->x;
	outVertexArray[* outLength].y=newVertex->y;
	/*CString cs;int i=0;
	  cs.Format("%d",outVertexArray[* outLength].x);
	  CDC *pDC;
	  pDC=GetDC();
	  pDC->TextOut(100+10*i,50,cs);*/
    (* outLength)++;
	//i++;

}/*程序Output()结束*/

void CDraw4View::SutherlandHodgmanEllipseClip(int inLength, VertexArray inVertexArray,int * outLength, VertexArray outVertexArray, Edge clipBoundary)
/*inVertexArray为输入多边形顶点数组,outVertexArray为裁剪结果多边形顶点数组,clipBoundary为裁剪边*/
{
	Vertex *s,*p,I;
	int j;
	*outLength=0;
	s=&(inVertexArray[inLength-1]);
	for(j=0;j<inLength;j++)
	{
		p=&(inVertexArray[j]);
		if(Inside(p,clipBoundary))
		{
			if(Inside(s,clipBoundary))
                Output(p,outLength,outVertexArray);/*p119书上的情况1*/
			else
			{
			 Intersect(s,p,clipBoundary,&I);/*p119书上的情况4*/
			 Output(&I,outLength,outVertexArray);
             Output(p,outLength,outVertexArray);
			}
		}
		else if(Inside(s,clipBoundary))
		{
           Intersect(s,p,clipBoundary,&I); /*p119书上的情况2*/
		   Output(&I,outLength,outVertexArray);
		}/*p119书上的情况3,没有输出*/
		s=p;
	}
}/*程序SutherlandHodgmanEllipseClip()结束*/
123

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -