Android Open Source - OpenGL-2D-Engine Simple Rectangle Physics

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License

The source code is released under:

Apache License

Java Source Code

package com.foolish.a2de.physics;
//from   w  w w.j a va  2  s .com
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import android.graphics.RectF;

import com.foolish.a2de.graphics.Rectangle;
import com.foolish.a2de.graphics.Shape;

public class SimpleRectanglePhysics implements IPhysics2D {

  private List<Rectangle> mPossibleCollisions;
  private boolean mIntersects = false;

  public SimpleRectanglePhysics(Rectangle... rects) {
    this(Arrays.asList(rects));
  }

  public SimpleRectanglePhysics(List<Rectangle> rects) {
    mPossibleCollisions = rects;
  }

  public boolean addRect(Rectangle rect) {
    if (mPossibleCollisions == null)
      mPossibleCollisions = new ArrayList<>();

    return mPossibleCollisions.add(rect);
  }

  public boolean removeRect(Rectangle rect) {
    if (mPossibleCollisions == null)
      return false;

    return mPossibleCollisions.remove(rect);
  }

  @Override
  public void applyPhysics(Shape shape) {
    Rectangle rect = (Rectangle) shape;
    rect.update();

    mIntersects = false;

    for (Rectangle possibleCollision : mPossibleCollisions) {
      if (rect.intersects(possibleCollision)) {
        mIntersects = true;
        rect.translate(-rect.speed().x, -rect.speed().y);

        RectF boundsRect = rect.bounds();
        RectF boundsCollision = possibleCollision.bounds();

        if (boundsRect.bottom <= boundsCollision.top) {
          rect.translate(rect.speed().x, 0.0f);
          rect.setSpeed(rect.speed().x, 0.0f);
          rect.setGrounded(true);
        } else if (boundsRect.left >= boundsCollision.right) {
          rect.translate(0.0f, rect.speed().y);
          rect.setSpeed(0.0f, rect.speed().y);
        } else if (boundsRect.right <= boundsCollision.left) {
          rect.translate(0.0f, rect.speed().y);
          rect.setSpeed(0.0f, rect.speed().y);
        } else if (boundsRect.top >= boundsCollision.bottom) {
          rect.translate(rect.speed().x, 0.0f);
          rect.setSpeed(rect.speed().x, -0.01f);
        }
      }
    }

    if (!mIntersects) {
      float y = rect.speed().y;
      y -= 0.001f;
      if (y <= -0.02f) {
        y = -0.02f;
      }
      rect.setSpeed(rect.speed().x, y);
    }

  }
}

Java Source Code List

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