DrawView.cs


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Util;
using Android.Views;
using Android.Widget;

using Android.Graphics;

namespace BluetoothChat
{
	[Register("BluetoothChat.DrawView")]
	public class DrawView : View
	{

		private Path drawPath;
		private Paint drawPaint, canvasPaint;
		private Canvas drawCanvas;
		private Bitmap canvasBitmap;

		public DrawView (Context context) :
			base (context)
		{
			Initialize ();
		}

		public DrawView (Context context, IAttributeSet attrs) :
			base (context, attrs)
		{
			Initialize ();
		}

		public DrawView (Context context, IAttributeSet attrs, int defStyle) :
			base (context, attrs, defStyle)
		{
			Initialize ();
		}

		void Initialize ()
		{

			drawPath = new Path ();
			drawPaint = new Paint ();

			drawPaint.AntiAlias = true;
			drawPaint.StrokeWidth = 15;
			drawPaint.SetStyle (Paint.Style.Stroke);
			drawPaint.StrokeJoin = Paint.Join.Round;
			drawPaint.StrokeCap = Paint.Cap.Round;

			canvasPaint = new Paint (PaintFlags.Dither);



//			var drawButt = FindViewById<Button> (Resource.Id.drawButton);
//			drawButt.Click += (object sender, EventArgs e) => {
//
//				Console.WriteLine("draw");
//				setColor(false);
//			};
//
//			var clearButt = FindViewById<Button> (Resource.Id.clearButton);
//			clearButt.Click += (object sender, EventArgs e) => {
//
//				Console.WriteLine("clear");
//				setColor(true);
//			};
		}

		public void setColor(bool erase){

			Invalidate ();

			if (!erase) {

				drawPaint.Color = Color.Black;
			} else {
				drawPaint.Color = Color.White;
			}
		}

		public bool onTouchEvent(MotionEvent event1){

			Console.WriteLine ("touch event");

			float x = event1.GetX ();
			float y = event1.GetY ();

			switch (event1.Action) {

			case MotionEventActions.Down:
				drawPath.MoveTo (x, y);
				break;
			case MotionEventActions.Move:
				drawPath.LineTo (x, y);
				break;
			case MotionEventActions.Up:
				drawCanvas.DrawPath (drawPath, drawPaint);
				drawPath.Reset ();
				break;
			default:
				return false;
			}

			Invalidate ();
			return true;
		}
	}
}