Cylinder.java

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package edu.tum.cs.vis.items;

import edu.tum.cs.util.math.Vector3f;
import edu.tum.cs.vis.Canvas;
import edu.tum.cs.vis.Drawable;


public class Cylinder implements Drawable {

        protected int cylinder_detail=0;
        protected float[] cylinderX,cylinderZ;
        protected float h, r, r2;
        protected Vector3f v1, v2;
        
        public Cylinder(Vector3f v1, Vector3f v2, float r){
                this(v1,v2,r,r);
        }
        
        public Cylinder(Vector3f v1, Vector3f v2, float r, float r2){
                h = (float)v1.distance(v2);
                this.v1 = v1;
                this.v2 = v2;
                this.r = r;
                this.r2 = r2;
                cylinderDetail(30);
        }
        
        public void draw(Canvas c) { 
                c.pushMatrix();
                c.noStroke();           
                c.translate(v1.x, v1.y, v1.z);
                Vector3f dir = new Vector3f(v2);
                dir.subtract(v1);
                Vector3f cp = new Vector3f();
                Vector3f yAxis = new Vector3f(0,1,0);
                cp.cross(dir, yAxis);
                if(cp.distance(new Vector3f(0,0,0)) != 0){
                        double theta = dir.angle(yAxis);
                        c.rotateAxis(theta,cp);
                }               
                c.translate(0,h/2,0);
                cylinder(c,r,r2,h,true,true);
                c.popMatrix();
        }
/*
        public Cylinder(Vector3f v1, Vector3f v2, float r){
                this(v1,v2,r,r);
        }
        
        public Cylinder(Vector3f v1, Vector3f v2, float r, float r2){
                h = (float)v1.distance(v2);
                this.v1 = v1;
                this.v2 = v2;
                this.r = r;
                this.r2 = r2;
        }
        
        public void setNewCoords(Vector3f v1New, Vector3f v2New){
                this.v1 = v1New;
                this.v2 = v2New;
        }
        
        public void draw(Canvas c) { 
                c.pushMatrix();
                c.noStroke();
                
                c.translate(v1.x, v1.y, v1.z);
                Vector3f dir = new Vector3f(v2);
                dir.subtract(v1);
                Vector3f cp = new Vector3f();
                Vector3f yAxis = new Vector3f(0,1,0);
                cp.cross(dir, yAxis);
                if(cp.distance(new Vector3f(0,0,0)) != 0){
                        double theta = dir.angle(yAxis);
                        c.rotateAxis(theta,cp);
                }               
                c.translate(0,h/2,0);
                cylinder(c,r,r2,h,true,true);
                c.popMatrix();
        }
*/      

        protected void cylinderDetail(int res) {
                if(res < 3)
                        res = 3; // force minimum res
                if(res != cylinder_detail) {
                        float delta = (float) Math.PI * 2 / res;//g.SINCOS_LENGTH/res;
                        cylinderX = new float[res];
                        cylinderZ = new float[res];
                        // calc unit circle in current resolution in XZ plane
                        for(int i = 0; i < res; i++) {
                                cylinderX[i] = (float) Math.cos(i * delta);//g.cosLUT[(int) (i*delta) % g.SINCOS_LENGTH];
                                cylinderZ[i] = (float) Math.sin(i * delta);//g.sinLUT[(int) (i*delta) % g.SINCOS_LENGTH];
                        }
                        cylinder_detail = res;
                }
        }

        protected void cylinder(Canvas c, float r1, float r2, float h, boolean topCap, boolean bottomCap) {
                if(cylinder_detail == 0) {
                        cylinderDetail(30);
                }
                h *= 0.5;
                if(topCap) {
                        c.beginShape(Canvas.TRIANGLE_STRIP);
                        for(int i = 0; i < cylinder_detail; i++) {
                                c.vertex(0, -h, 0);
                                c.vertex(cylinderX[i] * r1, -h, cylinderZ[i] * r1);
                        }
                        c.vertex(0, -h, 0);
                        c.vertex(cylinderX[0] * r1, -h, cylinderZ[0] * r1);
                        c.endShape();
                }
                c.beginShape(Canvas.TRIANGLE_STRIP);
                for(int i = 0; i < cylinder_detail; i++) {
                        c.vertex(cylinderX[i] * r1, -h, cylinderZ[i] * r1);
                        c.vertex(cylinderX[i] * r2, h, cylinderZ[i] * r2);
                }
                c.vertex(cylinderX[0] * r1, -h, cylinderZ[0] * r1);
                c.vertex(cylinderX[0] * r2, h, cylinderZ[0] * r2);
                c.endShape();
                if(bottomCap) {
                        c.beginShape(Canvas.TRIANGLE_STRIP);
                        for(int i = 0; i < cylinder_detail; i++) {
                                c.vertex(0, h, 0);
                                c.vertex(cylinderX[i] * r2, h, cylinderZ[i] * r2);
                        }
                        c.vertex(0, h, 0);
                        c.vertex(cylinderX[0] * r2, h, cylinderZ[0] * r2);
                        c.endShape();
                }
        }

}

---

mod_vis
Author(s): Moritz Tenorth, Jakob Engel
autogenerated on Fri Jan 11 09:54:14 2013