draw a cone/cylinder in P3D
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5 months ago
this is a simple and fast snippet to draw a cone, the original code
here only draws a cylinder, i made a few fast and simple changes to serve my need to draw a cone.
(i'm posting this so that anyone searching for such thing would find it ready)
(i'm posting this so that anyone searching for such thing would find it ready)
- /**
- cylinder taken from http://wiki.processing.org/index.php/Cylinder
- @author matt ditton
- @modified by Abbas Noureddine, to draw a cone with specified width, dimeter of both
- top and bottom. (if top == bottom, then you have a cylinder)
- plus added a translation to draw the cone at the center of the bottom side
- */
- void cylinder(float bottom, float top, float h, int sides)
- {
- pushMatrix();
- translate(0,h/2,0);
- float angle;
- float[] x = new float[sides+1];
- float[] z = new float[sides+1];
- float[] x2 = new float[sides+1];
- float[] z2 = new float[sides+1];
- //get the x and z position on a circle for all the sides
- for(int i=0; i < x.length; i++){
- angle = TWO_PI / (sides) * i;
- x[i] = sin(angle) * bottom;
- z[i] = cos(angle) * bottom;
- }
- for(int i=0; i < x.length; i++){
- angle = TWO_PI / (sides) * i;
- x2[i] = sin(angle) * top;
- z2[i] = cos(angle) * top;
- }
- //draw the bottom of the cylinder
- beginShape(TRIANGLE_FAN);
- vertex(0, -h/2, 0);
- for(int i=0; i < x.length; i++){
- vertex(x[i], -h/2, z[i]);
- }
- endShape();
- //draw the center of the cylinder
- beginShape(QUAD_STRIP);
- for(int i=0; i < x.length; i++){
- vertex(x[i], -h/2, z[i]);
- vertex(x2[i], h/2, z2[i]);
- }
- endShape();
- //draw the top of the cylinder
- beginShape(TRIANGLE_FAN);
- vertex(0, h/2, 0);
- for(int i=0; i < x.length; i++){
- vertex(x2[i], h/2, z2[i]);
- }
- endShape();
- popMatrix();
}
