Computational Form

Week 7 Assignment (desc)

Younghyun Chung

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 radius, float height, int numSteps )
{
     glPushMatrix();
     glRotatef( mouseY, 1,0,0 );

     for( int i=0; i<numSteps; i++ )
     {
          glBegin( GL_LINE_LOOP );
          for( int A=0; A<30; A++ )
          {
               float ang = A / 30.0 * PI * 2.0;
               float x = radius*cos(ang);
               float y = height * i/numSteps - 300;
               float z = radius*sin(ang);
               glVertex3f( x,y,z );
          }
          glEnd();
     }
     
     glBegin( GL_LINES );
     for( int A=0; A<30; A++ )
     {
          float ang = A / 30.0 * PI * 2.0;
          float x = radius*cos(ang);
          float z = radius*sin(ang);
          glVertex3f( x,-300,z );
          glVertex3f( x,height * (numSteps-1)/numSteps -300,z );
     }
     glEnd();
     
     glPopMatrix();

}

:

drawWireframeCylinder( 200.0, 600.0, 10 );

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, int numSteps )
{
     glColor3f( 0,0,0 );
     glPushMatrix();
     glRotatef( mouseY, 1,0,0 );
     
     for( int i=0;i<numSteps;i++ ) 
     {
          glBegin( GL_LINE_LOOP );
          for ( int j=0;j<numPoints;j++ )
          {
              float z = height * i/numSteps;    
              glVertex3f( Points[j].x-300,Points[j].y,z );
          }
          glEnd();
     }
     glPopMatrix();
}               

void drawW8_2( void ) 
{
     Points = new Shape();
     Points->addPoint( Vec2d( 100,100 ) );
     Points->addPoint( Vec2d( 500,200 ) );
     Points->addPoint( Vec2d( 600,200 ) );
     Points->addPoint( Vec2d( 600,300 ) );
     Points->addPoint( Vec2d( 500,300 ) );
     Points->addPoint( Vec2d( 450,250 ) );
     Points->draw();
     
     drawWireframeExtrusion( Points->PointList, Points->numPoints, 500, 10 );     
}

: extrusion of shape