addd boxes examples

Author: codeanticode

sensors/ex2_boxes/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package=""><uses-sdk android:minSdkVersion="15" android:targetSdkVersion="23"/><application android:debuggable="true" android:icon="@drawable/icon" android:label=""><activity android:name=".MainActivity">android:theme="@android:style/Theme.NoTitleBar"&gt;<intent-filter><action android:name="android.intent.action.MAIN"/><category android:name="android.intent.category.LAUNCHER"/></intent-filter></activity></application></manifest>

sensors/ex2_boxes/Box.pde

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+class Box {
+  Body body;
+  float w;
+  float h;
+
+  // Constructor
+  Box(float x, float y) {
+    w = random(50, 100);
+    h = random(50, 100);
+    // Add the box to the box2d world
+    makeBody(new Vec2(x, y), w, h);
+  }
+
+  void display() {
+    Vec2 pos = box2d.getBodyPixelCoord(body);
+    float a = body.getAngle();
+
+    rectMode(CENTER);
+    pushMatrix();
+    translate(pos.x, pos.y);
+    rotate(-a);
+    fill(175);
+    stroke(0);
+    rect(0, 0, w, h);
+    popMatrix();
+  }
+
+  void makeBody(Vec2 center, float w_, float h_) {
+    // Define a polygon (this is what we use for a rectangle)
+    PolygonShape sd = new PolygonShape();
+    float box2dW = box2d.scalarPixelsToWorld(w_/2);
+    float box2dH = box2d.scalarPixelsToWorld(h_/2);
+    sd.setAsBox(box2dW, box2dH);
+
+    // Define a fixture
+    FixtureDef fd = new FixtureDef();
+    fd.shape = sd;
+    // Parameters that affect physics
+    fd.density = 1;
+    fd.friction = 0.3;
+    fd.restitution = 0.5;
+
+    // Define the body and make it from the shape
+    BodyDef bd = new BodyDef();
+    bd.type = BodyType.DYNAMIC;
+    bd.position.set(box2d.coordPixelsToWorld(center));
+
+    body = box2d.createBody(bd);
+    body.createFixture(fd);
+
+    // Give it some initial random velocity
+    shake();
+  }
+  
+  void shake() {
+    body.setLinearVelocity(new Vec2(random(-5, 5), random(2, 5)));
+    body.setAngularVelocity(random(-5, 5));    
+  }
+}

sensors/ex2_boxes/Wall.pde

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+class Wall {
+  float x;
+  float y;
+  float w;
+  float h;
+  
+  Body b;
+
+  Wall(float x_,float y_, float w_, float h_) {
+    x = x_;
+    y = y_;
+    w = w_;
+    h = h_;
+
+    PolygonShape sd = new PolygonShape();
+    float box2dW = box2d.scalarPixelsToWorld(w/2);
+    float box2dH = box2d.scalarPixelsToWorld(h/2);
+    sd.setAsBox(box2dW, box2dH);
+
+    BodyDef bd = new BodyDef();
+    bd.type = BodyType.STATIC;
+    bd.position.set(box2d.coordPixelsToWorld(x, y));
+    b = box2d.createBody(bd);
+    
+    // Attached the shape to the body using a Fixture
+    b.createFixture(sd, 1);
+  }
+
+  void display() {
+    fill(100);
+    noStroke();
+    rectMode(CENTER);
+    rect(x, y, w, h);
+  }
+}

sensors/ex2_boxes/code/sketch.properties

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+mode=Android
+mode.id=processing.mode.android.AndroidMode

sensors/ex2_boxes/ex2_boxes.pde

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+// Android Mode tutorials
+// http://android.processing.org/tutorials/
+// Sensors - Boxes example
+
+// Rectangles trapped inside the screen, and moving by gravity
+// Based on Box2DProcessing from The Nature of Code
+
+import android.content.Context;
+import android.hardware.Sensor;
+import android.hardware.SensorManager;
+import android.hardware.SensorEvent;
+import android.hardware.SensorEventListener;
+
+import shiffman.box2d.*;
+import org.jbox2d.collision.shapes.*;
+import org.jbox2d.common.*;
+import org.jbox2d.dynamics.*;
+
+Context context;
+SensorManager manager;
+Sensor sensor;
+AccelerometerListener listener;
+float ax, ay, az;
+
+Box2DProcessing box2d;
+ArrayList<Box> boxes;
+ArrayList<Wall> walls;
+
+void setup() {
+  fullScreen(P2D);
+  orientation(PORTRAIT);
+  
+  context = getActivity();
+  manager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
+  sensor = manager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
+  listener = new AccelerometerListener();
+  manager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_NORMAL);
+  
+  box2d = new Box2DProcessing(this);
+  box2d.createWorld();
+  
+  // A group of boxes
+  boxes = new ArrayList<Box>();
+  for (int i = 0; i < 20; i++) {
+    Box p = new Box(random(200, width-200), random(200, height-200));
+    boxes.add(p);
+  }
+  
+  // Invisible walls
+  walls = new ArrayList<Wall>();
+  walls.add(new Wall(width/2, -25, width, 50));
+  walls.add(new Wall(width/2, height+25, width, 50));
+  walls.add(new Wall(-25, height/2, 50, height));
+  walls.add(new Wall(width+25, height/2, 50, height));
+}
+
+void draw() {
+  background(255);  
+  
+  // update gravity from accelerometer data.
+  box2d.setGravity(-ax, -ay);
+  
+  box2d.step();
+  
+  for (Box b: boxes) {
+    b.display();
+  }
+}
+
+void mousePressed() {
+  for (Box b: boxes) {
+    b.shake();
+  }   
+}
+
+public void onResume() {
+  super.onResume();
+  if (manager != null) {
+    manager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_GAME);
+  }
+}
+
+public void onPause() {
+  super.onPause();
+  if (manager != null) {
+    manager.unregisterListener(listener);
+  }
+}
+
+class AccelerometerListener implements SensorEventListener {
+  public void onSensorChanged(SensorEvent event) {
+    ax = event.values[0];
+    ay = event.values[1];
+    az = event.values[2];    
+  }
+  public void onAccuracyChanged(Sensor sensor, int accuracy) {
+  }
+}

sensors/ex2_boxes/sketch.properties

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+mode=Android
+mode.id=processing.mode.android.AndroidMode