CS621 Lab 1 Name: Ihab Zbib

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Gordon Morris
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1 CS621 Lab 1 Name: Ihab Zbib 1) The program draw.cpp draws two rectangles and two triangles. The program compiles and executes successfully. What follows are the snap shots of the output. Illustration 1: Output draw.cpp The following is the source code of draw.cpp //draw.cpp #include <GL/glut.h> //initialization void init( void ) glclearcolor( 1.0, 1.0, 1.0, 0.0 ); //get white background color glcolor3f( 0.0f, 0.0f, 0.0f ); //set drawing color

2 glpointsize( 14.0 ); //a dot is 4x4 glmatrixmode( GL_PROJECTION ); //subsequent calls affect projection matrices glloadidentity(); //replace current matrix with identity matrix gluortho2d( 0, 500, 0, ); //gluortho2d( -1, 1, 0, 20 ); //glviewport(0, 0, 2, 2); void display( void ) glclear( GL_COLOR_BUFFER_BIT ); //clear screen //glviewport( 250, 250, 200, 200); glbegin( GL_POINTS ); //draw points glvertex2f( -0.5, 0.5 ); //draw a point glvertex2f(.2,.5 ); //draw a point glvertex2f( -0.5, 1.2 ); //draw a point glbegin( GL_LINES ); //draw lines glvertex2i( 20, 20 ); //horizontal line glvertex2i( 400, 20 ); glvertex2i( 20, 20 ); //vertical line glvertex2i( 20, 400 ); glvertex2i( 400, 20 ); glvertex2i( 20, 400 ); glbegin( GL_LINE_STRIP ); //draw polyline glvertex2i( 200, 100 ); glvertex2i( 300, 100 ); glvertex2i( 300, 400 ); glvertex2i( 200, 100 ); glcolor3f( 0.6, 0.6, 0.6 ); //bright grey glrecti( 350, 350, 480, 480 ); glcolor3f( 1.0, 0.0, 0.0 ); //red glrecti( 200, 400, 280, 480 ); // glviewport( 0, 0, 200, 200); glbegin( GL_POINTS ); glvertex2i( 100, 100 ); glvertex2i( 100, 200 ); glvertex2i( 100, 300 ); glbegin( GL_LINES ); glvertex2i( 20, 20 ); glvertex2i( 400, 20 ); glvertex2i( 20, 20 ); //draw points //draw a point //draw a point //draw a point //draw lines //horizontal line //vertical line

3 glvertex2i( 20, 400 ); glvertex2i( 400, 20 ); glvertex2i( 20, 400 ); glbegin( GL_LINE_STRIP ); glvertex2i( 200, 100 ); glvertex2i( 300, 100 ); glvertex2i( 300, 400 ); glvertex2i( 200, 100 ); glcolor3f( 0.6, 0.6, 0.6 ); glrecti( 350, 350, 480, 480 ); glcolor3f( 1.0, 0.0, 0.0 ); glrecti( 200, 400, 280, 480 ); //draw polyline //bright grey //red glflush(); //send all output to screen 2) The following is the output of the program mouse_key with the line 15 points thick. Illustration 2: Output of mouse_key with brush size 15 points

4 3) the following is the program mouse_key with gluortho2d( -1, 1, 0, 2). In order to display the elements properly the dimensioned where scaled to fit. The following is the output of mouse_key using gluortho2d( -1, 1, 0, 2 ) : Illustration 3: Output of mouse_key with gluortho2d( -1, 1, 0, 2 );

5 4) The following variant of mouse_key displays the objects in 1. the upper left quadrant if 1 is pressed 2. lower left quadrant if 2 is pressed 3. upper right quadrant if 3 i spressed 4. lower right quadran if 4 is pressed The following are the snapshots of the different cases: Illustration 4: Output in the left upper corner

6 Illustration 5: Output in the righ tupper corner

7 Illustration 6: Output in the right lower corner

8 Illustration 7: Output in the right lower corner The following is the code of mouse_key.cpp: //mouse_key.cpp #include <GL/glut.h> #include <stdlib.h> #include <iostream> using namespace std; #define screenheight 2.0f int corner = 1; //initialization void init( void ) glclearcolor( 1.0, 1.0, 1.0, 0.0 ); //get white background color

9 glcolor3f( 0.0f, 0.0f, 0.0f ); //set drawing color glpointsize( 15.0 ); //a dot is 4x4 glmatrixmode( GL_PROJECTION ); glloadidentity(); //gluortho2d( 0.0, 500.0, 0.0, ); gluortho2d( -1, 1, 0, 2 ); //init void display() glclear( GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT ); glflush(); void drawdot( float x, float y ) glbegin( GL_POINTS ); glvertex2f( x, y ); //drawdot //draw a points void mymouse( int button, int state, int x, int y ) float xf = x * (2.0f/500.0f) - 1; float yf = y * (2.0f/500.0f); if ( button == GLUT_LEFT_BUTTON && state == GLUT_DOWN ) switch(corner) case 1: glviewport(0, 300, 200, 200); //Upper Left drawdot( xf, screenheight - yf ); case 2: glviewport(300, 300, 200, 200); //Upper Right drawdot( xf, screenheight - yf ); case 3: glviewport(0, 0, 200, 200); //Lower Left drawdot( xf, screenheight - yf ); case 4: glviewport(300, 0, 200, 200); //Upper Right drawdot( xf, screenheight - yf ); glflush(); //send all output to screen

10 void mousepointer(glfloat xf, GLfloat yf) GLfloat brushsize = 15.0f * 2.0f / 500.0f; glcolor3f( 1.0, 0.0, 0.0 ); //glrecti ( x, y, x + brushsize, y + brushsize ); glbegin(gl_polygon); // Drawing Using polygons glvertex3f(xf, yf, 0); // Left glvertex3f(xf + brushsize/2.0f, yf - brushsize, 0); // Bottom glvertex3f(xf + brushsize, yf, 0); // Right glvertex3f(xf + brushsize/2.0f, yf + brushsize, 0); glflush(); // Top void mymovedmouse( int mousex, int mousey) //GLint x = mousex; //GLint y = screenheight - mousey; GLfloat xf = mousex * (2.0f/500.0f) - 1; GLfloat yf = screenheight - mousey * (2.0f/500.0f); switch(corner) case 1: glviewport(0, 300, 200, 200); //Upper Left mousepointer(xf, yf); case 2: glviewport(300, 300, 200, 200); //Upper Right mousepointer(xf, yf); case 3: glviewport(0, 0, 200, 200); //Lower Left mousepointer(xf, yf); case 4: glviewport(300, 0, 200, 200); //Upper Right mousepointer(xf, yf); //mymovedmouse void mykeyboard ( unsigned char key, int mousex, int mousey ) //GLint x = mousex; //GLint y = screenheight - mousey; GLfloat xf = mousex * (2.0f/500.0f) - 1;

11 GLfloat yf = mousey * (2.0f/500.0f); switch( key ) case 'p': drawdot ( xf, yf ); case 'e': exit ( -1 ); case '1': corner = 1; case '2': corner = 2; case '3': corner = 3; case '4': corner = 4; default :

CS Computer Graphics: OpenGL, Continued

CS Computer Graphics: OpenGL, Continued CS 543 - Computer Graphics: OpenGL, Continued by Robert W. Lindeman gogo@wpi.edu (with help from Emmanuel Agu ;-) Last time. OpenGL set up Basic structure OpenGL skeleton Callback functions, etc. R.W.