Computational Form

Week 7 Assignment

Yasmin Elayat

Problem 1. Create a function called drawWireframeCylinder that takes as input a radius (float), a height (float) and a number of steps (int). The function should draw a series of circles stacked vertically as specified. Draw vertical lines between the circles to complete wireframe effect.

void drawWireframeCylinder(float rad=100.0, float height=10, int step=50) {
    //rotate around x, y, or z axis
    glPushMatrix();
    glRotatef(mouseY, 1,0,0);
    
    glColor4f( 1.0,1.0,1.0, 0.5 );
    for(int D=0; D < height; D++) {
        glBegin(GL_LINE_LOOP);          
        for(int A=0; A<30; A++) //to draw 3d flat circle
        {
                
                float ang = A/30.0 * 3.14159*2.0;
                float x= rad*cos(ang);
                float y=D*step - rad; //mouseY-400;
                float z= rad*sin(ang);
                glVertex3f(x,y,z);
        }
        glEnd();
                     
    }
    
    for(int A=0; A<30; A++) //to draw 3d flat circle
    {
             float ang = A/30.0 * 3.14159*2.0;
             float x= rad*cos(ang);
             float y1=0*step - rad; 
             float y2=(height-1)*step - rad; 
             float z=rad*sin(ang);
             glBegin(GL_LINES);
             glVertex3f(x,y1,z);
             glVertex3f(x,y2,z);
             glEnd();
    }
    
    glPopMatrix(); 
}

Problem 2. Create a function called drawWireframeExtrusion that takes as input an array of points (Vec2d*), the number of points (int), a height (float) and a number of steps (int). The function should draw a wireframe extrusion of the two-dimensional form that is passed in.

void drawWireframeExtrusion(Vec2d points[], int numPoints, float height=10, int step=50) {
     glPushMatrix();
     glRotatef(mouseY, 1,0,0);
    
     
     glColor4f(1.0,1.0,1.0,0.5);
     
     for(int D=0; D < height; D++) {
             glBegin(GL_LINE_STRIP);
             for(int i = 0; i < numPoints; i++){   
                     glVertex3f(points[i].x, D*step, points[i].y);
             }
             glEnd();
     }


     glColor3f(1.0,1.0,1.0);
     for(int i = 0; i < numPoints; i++){   
             glBegin(GL_LINE_STRIP);
             for(int D=0; D < height; D++) {
                     glVertex3f(points[i].x, D*step, points[i].y);
             }
             glEnd();
     }
             
             
     glPopMatrix();
}

Problem 3. Create a function called drawWireframeRevolution that takes as input an array of points (Vec2d) and the number of points (int). The function should uses the array of points as a revolution profile. To do this, draw a circle for each point in the array where the circle's radius is equal to the point's X component, and the the circle's vertical height is equal to the circle's Y value. Complete the wireframe by drawing the vertical lines.

void drawWireframeRevolution(Vec2d points[], int numPoints=10) {
     glPushMatrix();
     glRotatef(mouseY, 1,0,0);      
     
     glColor4f(1.0,1.0,1.0,0.5);
     for(int i = 0; i < numPoints; i++){   
             glBegin(GL_LINE_LOOP); //POLYGON);         
             for(int A=0; A<30; A++) //to draw 3d flat circle
             {
                
                float ang = A/30.0 * 3.14159*2.0;
                float x= points[i].x*cos(ang);
                float y=points[i].y; //D*step - rad; 
                float z= points[i].x*sin(ang);
                glVertex3f(x,y,z);
             }
             glEnd();
     }
     
     glColor4f(1.0,1.0,1.0,0.6);
    for(int A=0; A<30; A++) //to draw 3d flat circle
    {
             float ang = A/30.0 * 3.14159*2.0;
             
             glBegin(GL_LINE_STRIP);     
             for(int i = 0; i < numPoints; i++) {
                     float x= points[i].x*cos(ang);
                     float y=points[i].y;  
                     float z= points[i].x*sin(ang);
                     //glVertex3f(points[i].x, points[i].y, 0);      
                     glVertex3f(x,y,z);
             }
             glEnd();
    }
     
    glPopMatrix();
}