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Bresenham’s Line algorithm

Bresenham’s Line algorithm. #include<stdlib.h> #include<math.h> Int round( const float a) { Return int(a+0.5); }. Void lineBres(int x0,int y0,int xEnd,int yEnd) { Int dx=fabs(xEnd-x0),dy=fabs(yEnd-y0); Int p=2*dy –dx; Int twoDy=2*dy, twoDyMinusDx=2*(dy-dx); Int x,y;. If(x0>xEnd)

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Bresenham’s Line algorithm

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  1. Bresenham’s Line algorithm

  2. #include<stdlib.h> #include<math.h> Int round( const float a) { Return int(a+0.5); }

  3. Void lineBres(int x0,int y0,int xEnd,int yEnd) { Int dx=fabs(xEnd-x0),dy=fabs(yEnd-y0); Int p=2*dy –dx; Int twoDy=2*dy, twoDyMinusDx=2*(dy-dx); Int x,y;

  4. If(x0>xEnd) { x=xEnd; Y=yEnd; xEnd=x0; } Else{ x=x0; Y=y0; } SetPixel(x,y);

  5. While(x<xEnd) { X++; If(p<0) P+=twoDy; Else{ Y++; P+=twoDyMinusDx; } SetPixel(x,y); } }

  6. Mid Point Circle Algorithm

  7. #include<iostream.h> #include<GL/glut.h> #include<GL/gl.h>

  8. class screenPt{ private: GLint x,y; public: screenPt(){ x=y=0; } void setCoords (GLint xCoordValue,GLint yCoordValue){ x=xCoordValue; y=yCoordValue; } GLint getx() const{ return x; } GLint gety() const{ return y; } void incrementx(){ x++; } void decrementy(){ y--; } };

  9. void setPixel(GLintxCoord,GLintyCoord){ glBegin(GL_POINTS); glVertex2i(xCoord,yCoord); glEnd(); } void circleMidpoint(GLintxc,GLintyc,GLint radius){ screenPtcircPt; GLint p=1-radius; circPt.setCoords(0,radius); void circlePlotPoints(GLint,GLint,screenPt); circlePlotPoints(xc,yc,circPt); while(circPt.getx()<circPt.gety()){ circPt.incrementx(); if(p<0) p+=2*circPt.getx()+1; else { circPt.decrementy(); p+=2*(circPt.getx()-circPt.gety())+1; } circlePlotPoints(xc,yc,circPt); } }

  10. void circlePlotPoints(GLintxc,GLintyc,screenPtcircPt){ setPixel(xc+circPt.getx(),yc+circPt.gety()); setPixel(xc-circPt.getx(),yc+circPt.gety()); setPixel(xc+circPt.getx(),yc-circPt.gety()); setPixel(xc-circPt.getx(),yc-circPt.gety()); setPixel(xc+circPt.gety(),yc+circPt.getx()); setPixel(xc-circPt.gety(),yc+circPt.getx()); setPixel(xc+circPt.gety(),yc-circPt.getx()); setPixel(xc-circPt.gety(),yc-circPt.getx()); }

  11. void init (void) { glClearColor(1.0,1.0,1.0,0.0); // set display window to white glMatrixMode(GL_PROJECTION); // set projection parameter gluOrtho2D(0.0,500.0,0.0,500.0); } void lineSegment(void) { glClear(GL_COLOR_BUFFER_BIT); // clear display window glColor3f(1.0,0.5,0.7); // set line segment color red circleMidpoint(50,50,40); glFlush(); // process all openGL routines as quickly as possible }

  12. void main(intargc,char** argv) { glutInit(&argc,argv); // initialize GLUT glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); // Set top-left display-window posision glutInitWindowPosition(50,100); //set top left display windowposition glutInitWindowSize(500,500); // set dosplay window width and height glutCreateWindow("an example OpenGL program"); //create display window //create display window init(); // execute initialization-procedure glutDisplayFunc(lineSegment); // send graphics to display window glutMainLoop(); // display every thing and wait }

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