ParallelogramDrawable

ParallelogramDrawable.java

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.Shape;


public class ParallelogramDrawable extends ShapeDrawable
{
	private double mAngle;
	
	
	public ParallelogramDrawable()
	{
		setShape(new ParallelogramShape());
	}
	
	public ParallelogramDrawable(int color)
	{
		this();
		getPaint().setColor(color);
	}
	
	public void setAngle(double angle)
	{
		mAngle = angle;
		onBoundsChange(getBounds()); // force resize
	}
	
	public double getAngle()
	{
		return mAngle;
	}
	
	public class ParallelogramShape extends Shape
	{
		private final Path mPath = new Path();
		
		@Override
		protected void onResize(float width, float height)
		{
			int offset = (int) (Math.tan(degreesToRadians(mAngle)) * height);
			Path path = mPath;
			path.reset();
			if(offset < 0){
				path.moveTo(0, 0);
				path.lineTo(width + offset, 0);
				path.lineTo(width, height);
				path.lineTo(-offset, height);
			}else{
				path.moveTo(offset, 0);
				path.lineTo(width, 0);
				path.lineTo(width - offset, height);
				path.lineTo(0, height);
			}
			path.close();
		}
		
		@Override
		public void draw(Canvas canvas, Paint paint)
		{
			canvas.drawPath(mPath, paint);
		}
	}
	
	private static double degreesToRadians(double degrees)
	{
		return (degrees / 360.0) * (2.0 * Math.PI);
	}
}