Android Open Source - Verlet Distance Constraint

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Back to project page Verlet.

License

The source code is released under:

Copyright 2013 Devicement http://devicement.com/ Copyright 2013 Sub Protocol and other contributors http://subprotocol.com/ Permission is hereby granted, free of charge, to any person obtaining a co...

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Java Source Code

package org.verletandroid.VerletCore.Contraints;
//  w  w  w  . j  av  a2  s  . c o  m
import android.graphics.Color;
import android.graphics.Paint;

import org.verletandroid.Graphics.IGraphics;
import org.verletandroid.VerletCore.Particle;
import org.verletandroid.VerletCore.Vec2;

/**
 * Created with IntelliJ IDEA.
 * User: George
 * Date: 28.04.13
 * Time: 23:50
 * To change this template use File | Settings | File Templates.
 */
public class DistanceConstraint implements IConstraint{

    public void setDistance(float distance) {
        this.distance = distance;
    }

    private float distance;

    public Particle getA() {
        return a;
    }

    public Particle getB() {
        return b;
    }

    private Particle a;
    private Particle b;
    private float stiffness;
    private int color = Color.parseColor("#d8dde2");
    Vec2 normal = new Vec2();
    public DistanceConstraint(Particle a, Particle b, float stiffness) {
        this.a = a;
        this.b = b;
        this.stiffness = stiffness;
        this.distance = a.getPos().sub(b.getPos()).length();
    }

    public DistanceConstraint(Particle a, Particle b, float stiffness, float distance) {
        this(a, b, stiffness);
        this.distance = distance;
    }

    @Override
    public void relax(float stepCoef) {
        normal.mutableSet(this.a.pos);
        normal.mutableSub(this.b.pos);
        float m = normal.length2();
        normal.mutableScale(((this.distance*this.distance - m)/m)*this.stiffness*stepCoef);
        this.a.pos.mutableAdd(normal);
        this.b.pos.mutableSub(normal);
    }

    @Override
    public void draw(IGraphics graphics) {
        graphics.setPenStyle(Paint.Style.STROKE);
        graphics.setStrokeWidth(3);
        graphics.setColorPen(color);
        graphics.drawLine(this.a.getPos().x, this.a.getPos().y,
                this.b.getPos().x, this.b.getPos().y);
    }

    @Override
    public Vec2 getPos() {
        return null;  //To change body of implemented methods use File | Settings | File Templates.
    }

    public float getDistance() {
        return distance;
    }
}

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