Android Open Source - adventure.datetime Camera

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License

The source code is released under:

MIT License

Java Source Code

package ca.cmput301f13t03.adventure_datetime.view.treeView;
/*w  w  w.java 2s.c  o  m*/
import android.graphics.*;

class Camera
{
  // these will be overwritten early on
  private static final float DEFAULT_WIDTH = 500;
  private static final float DEFAULT_HEIGHT = 1000;
  
  // x, y position of the top left of the screen in world coordinates
  private float x = 0;
  private float y = 0;
  
  // size of the view
  private float m_viewWidth = DEFAULT_WIDTH;
  private float m_viewHeight = DEFAULT_HEIGHT;
  
  // coords we want to keep centered
  private float m_xTarget = 0 - m_viewWidth / 2;
  private float m_yTarget = 0 - m_viewWidth / 2;
  
  private float m_zoomLevel = 1.0f;
  
  private Matrix m_transform = null;
  private Matrix m_inverse = null;
  
  private Object m_syncLock = new Object();
  
  public void DrawLocal(Canvas canvas, Paint paint, Path p)
  {
    synchronized (m_syncLock) 
    {
      p.transform(this.GetTransform());
      canvas.drawPath(p, paint);
      p.transform(this.GetInverseTransform());
    }
  }
  
  public void DrawLocal(Canvas canvas, Paint paint, Bitmap image, int x, int y)
  {
    synchronized (m_syncLock) 
    {
      Matrix trans = new Matrix(GetTransform());
      trans.setTranslate(x - this.x, y - this.y);
      canvas.drawBitmap(image, trans, paint);
    }
  }
  
  public void DrawLocal(Canvas canvas, Paint paint, String text, int centerX, int centerY)
  {
    synchronized (m_syncLock) 
    {
      float points[] = { centerX, centerY };
      this.GetTransform().mapPoints(points);
      canvas.drawText(text, points[0], points[1], paint);
    }
  }
  
  private Matrix GetTransform()
  {
    Matrix result = null;
    
    synchronized (m_syncLock) 
    {
      if(m_transform == null)
      {
        m_transform = new Matrix();
        m_transform.setScale(m_zoomLevel, m_zoomLevel);
        m_transform.setTranslate(-this.x, -this.y);
      }
      
      result = m_transform;
    }
    
    return result;
  }
  
  private Matrix GetInverseTransform()
  {
    Matrix result = null;
    
    synchronized (m_syncLock) 
    {
      if(m_inverse == null)
      {
        m_inverse = new Matrix();
        m_inverse.setScale(1.0f / m_zoomLevel, 1.0f / m_zoomLevel);
        m_inverse.setTranslate(this.x, this.y);
      }
      
      result = m_inverse;
    }
    
    return result;
  }
  
  public float GetXTarget()
  {
    return m_xTarget;
  }
  
  public float GetYTarget()
  {
    return m_yTarget;
  }
  
  public void ResizeView(float width, float height)
  {
    synchronized (m_syncLock) 
    {
      m_viewWidth = width;
      m_viewHeight = height;
      
      m_inverse = null;
      m_transform = null;
    }
    
    LookAt(m_xTarget, m_yTarget);
  }
  
  public void LookAt(float x, float y)
  {
    synchronized (m_syncLock) 
    {
      m_xTarget = x;
      m_yTarget = y;
      
      this.x = m_xTarget - m_viewWidth / 2;
      this.y = m_yTarget - m_viewHeight / 2;
      
      m_inverse = null;
      m_transform = null;
    }
  }
  
  public void ScreenCordsToWorldCords(float[] screenCords)
  {
    synchronized (m_syncLock) 
    {
      GetInverseTransform().mapPoints(screenCords);
    }
  }
}

Java Source Code List

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