package org.anddev.andengine.entity.modifier; import org.anddev.andengine.entity.IEntity; import org.anddev.andengine.util.modifier.ease.IEaseFunction; /** * (c) 2010 Nicolas Gramlich * (c) 2011 Zynga Inc. * * @author Nicolas Gramlich * @since 23:24:26 - 16.07.2011 */ public class QuadraticBezierMoveModifier extends DurationEntityModifier { // =========================================================== // Constants // =========================================================== // =========================================================== // Fields // =========================================================== private final float mX1; private final float mY1; private final float mX2; private final float mY2; private final float mX3; private final float mY3; private final IEaseFunction mEaseFunction; // =========================================================== // Constructors // =========================================================== public QuadraticBezierMoveModifier(final float pDuration, final float pX1, final float pY1, final float pX2, final float pY2, final float pX3, final float pY3, final IEaseFunction pEaseFunction) { super(pDuration); this.mX1 = pX1; this.mY1 = pY1; this.mX2 = pX2; this.mY2 = pY2; this.mX3 = pX3; this.mY3 = pY3; this.mEaseFunction = pEaseFunction; } @Override public QuadraticBezierMoveModifier deepCopy() { return new QuadraticBezierMoveModifier(this.mDuration, this.mX1, this.mY1, this.mX2, this.mY2, this.mX3, this.mY3, this.mEaseFunction); } // =========================================================== // Getter & Setter // =========================================================== // =========================================================== // Methods for/from SuperClass/Interfaces // =========================================================== @Override protected void onManagedUpdate(final float pSecondsElapsed, final IEntity pEntity) { final float percentageDone = this.mEaseFunction.getPercentage(this.getSecondsElapsed(), this.mDuration); final float u = 1 - percentageDone; final float tt = percentageDone*percentageDone; final float uu = u*u; final float ut2 = 2 * u * percentageDone; /* Formula: * ((1-t)^2 * p1) + (2*(t)*(1-t) * p2) + ((t^2) * p3) */ final float x = (uu * this.mX1) + (ut2 * this.mX2) + (tt * this.mX3); final float y = (uu * this.mY1) + (ut2 * this.mY2) + (tt * this.mY3); pEntity.setPosition(x, y); } @Override protected void onManagedInitialize(final IEntity pEntity) { } // =========================================================== // Methods // =========================================================== // =========================================================== // Inner and Anonymous Classes // =========================================================== }