计算机图形学

计算机图形学

姓名：李倩倩 班级：硕研10-14

学号：

第一题：

#include <> #include <> void MidpintLine( HDC hDC,int x0,int y0,int x1,int y1,unsigned long color) { int a,b,delta1,delta2,d,x,y; a=y0-y1; b=x1-x0; d=2*a+b; delta1=2*a; delta2=2*(a+b); x=x0; y=y0; SetPixel(hDC,x,y,color); while(x0) xinc=1; else xinc=-1; if(dy>0) yinc=1; else yinc=-1; dx=abs(dx);dy=abs(dy); int x=xs,y=ys; int i=0; if(dx==0&&dy==0) SetPixel(pdc,x,y,color); SetPixel(hDC,x,y,color); else if(dx==0) { for(i=0;i

else if(dx>dy)

{

int p=2*dy-dx;

int inc1=2*dy,inc2=2*(dy-dx);

for(i=0;i

{

SetPixel(pdc,x,y,color);

x+=xinc;

if(p<0)

p+=inc1;

else

{

y+=yinc;

p+=inc2;

}

}

}

else

{

int p=2*dx-dy;

int inc1=2*dx,inc2=2*(dx-dy);

for(i=0;i

{

SetPixel(pdc,x,y,color);

y+=yinc;

if(p<0)

p+=inc1;

else

{

x+=xinc;

p+=inc2;

}

}

}

}

void circlePlotPoints(HDC pdc, int xc,int yc,int x,int y,COLORREF color) {

SetPixel(pdc,xc+x,yc+y,color);

SetPixel(pdc,xc+x,yc-y,color);

SetPixel(pdc,xc-x,yc+y,color);

SetPixel(pdc,xc-x,yc-y,color);

SetPixel(pdc,xc+y,yc+x,color);

SetPixel(pdc,xc+y,yc-x,color); SetPixel(pdc,xc-y,yc+x,color);

SetPixel(pdc,xc-y,yc-x,color);

}

void MidpointCircle(HDC pdc,int xc,int yc,int r,COLORREF color)

{

int x=0;

int y=r;

int p=1-r;

while(x<=y)

{

circlePlotPoints(pdc,

xc,yc,x,y,color);

x++;

if(p<0)

p+=2*x+1;

else

{

y--;

p+=2*(x-y)+1;

}

}

}

void drawCircle(HDC pdc,int

xc,int yc,int radius,COLORREF

color)

{

int x,y,p;

x=0;

y=radius;

p=3-2*radius;

while (x

circlePlotPoints(pdc,xc,yc,x,y,

color);

if (p<0) p=p+4*x+6;

else{

p=p+4*(x-y)+10;

y-=1;

}

x+=1;

}

if(x==y)

circlePlotPoints(pdc,

xc,yc,x,y,color);

}

int main(int argc, char* argv[])

{

char arg[200]={0};

arg[0]='\"';

strcpy(arg+1,argv[0]);

int

len=int(strlen(arg));

arg[len]='\"';

HWND

hWnd=FindWindow(NULL,arg);

HDC

hDC=GetDC(hWnd);

unsigned long color=0xffffff; MidpintLine(hDC,10,30,100,100,color );

bresenham(hDC,10,10,600,600,color); MidpointCircle(hDC,50,50,30,color); drawCircle(hDC,100,100,30,color); return 0;

}

第二题：

#include

#include <>

#include <>

void init()

{

glClearColor(1.0f, 1.0f, 1.0f, 1.0f);

glMatrixMode(GL_PROJECTION); gluOrtho2D(0.0f, 800.0f, 0.0f, 600.0f);

}

class wcPt2D {

public:

wcPt2D(float _x, float _y) {

x = _x, y = _y;

}

GLfloat x, y;

};

wcPt2D pt[] = {wcPt2D(0,0), wcPt2D(100,0), wcPt2D(50,50)};

= verts[k].x + tx; verts[k].y = verts[k].y + ty;

}

glBegin(GL_POLYGON);

for(k = 0;k

glVertex2f(verts[k].x,

verts[k].y);

glEnd();

}

wcPt2D vertsRot[3] = {wcPt2D(0,0), wcPt2D(0,0), wcPt2D(0,0)};

= + (verts[k].x - * cos(theta) - (verts[k].y - * sin(theta); vertsRot[k].y = + (verts[k].x - * sin(theta) + (verts[k].y - * cos(theta);

}

glBegin(GL_POLYGON);

for(k = 0;k

glVertex2f(vertsRot[k].x,

vertsRot[k].y);

glEnd();

}

wcPt2D vertsNew[3] = {wcPt2D(0,0), wcPt2D(0,0), wcPt2D(0,0)};

= verts[k].x * sx + * (1 - sx); vertsNew[k].y = verts[k].y * sy + * (1 - sy);

}

glBegin(GL_POLYGON);

for(k = 0;k

vertsNew[k].y);

glEnd();

}

void Render()

{

glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0f, 0.0f, 0.0f); translatePolygon(pt, 3, 200,20);

//rotatePolygon(pt, 3, pt[0], 10); scalePolygon(pt, 3, pt[0], 5,5); glFlush();

}

int main(int argc, char** argv)