public class DoodleImageView extends View { // drawing path private Path drawPath; // drawing point private boolean drawPoint; // drawing and canvas paint public Paint drawPaint; public Paint tempPaint; private Paint canvasPaint; // initial color private int paintColor; // canvas private Canvas drawCanvas; // canvas bitmap private Bitmap canvasBitmap; private ArrayList<Path> paths = new ArrayList<Path>(); private ArrayList<Integer> pathscolor = new ArrayList<Integer>(); private ArrayList<Integer> pointcolor = new ArrayList<Integer>(); private ArrayList<Integer> marker = new ArrayList<Integer>(); private ArrayList<Point> points = new ArrayList<Point>(); private float mX, mY; private final float TOUCH_TOLERANCE = 1; public DoodleImageView(Context context, AttributeSet attrs) { super(context, attrs); setupDrawing(); // TODO Auto-generated constructor stub } private void setupDrawing() { // get drawing area setup for interaction drawPath = new Path(); drawPaint = new Paint(); // drawPaint.setColor(paintColor); drawPaint.setAntiAlias(true); drawPaint.setStrokeWidth(20); drawPaint.setStyle(Paint.Style.STROKE); drawPaint.setStrokeJoin(Paint.Join.ROUND); drawPaint.setStrokeCap(Paint.Cap.ROUND); canvasPaint = new Paint(Paint.DITHER_FLAG); } private Paint setUpPaint(int color) { tempPaint = new Paint(); tempPaint.setColor(color); tempPaint.setAntiAlias(true); tempPaint.setStrokeWidth(20); tempPaint.setStyle(Paint.Style.STROKE); tempPaint.setStrokeJoin(Paint.Join.ROUND); tempPaint.setStrokeCap(Paint.Cap.ROUND); return tempPaint; } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { // TODO Auto-generated method stub super.onSizeChanged(w, h, oldw, oldh); canvasBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); drawCanvas = new Canvas(canvasBitmap); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub if (marker.size() > 0) { for (int i = 0; i < paths.size(); i++) { canvas.drawPath(paths.get(i), setUpPaint(pathscolor.get(i))); } for (int i = 0; i < points.size(); i++) { canvas.drawPoint(points.get(i).x, points.get(i).y, setUpPaint(pointcolor.get(i))); } } canvas.drawPath(drawPath,drawPaint); } @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub float touchX = event.getX(); float touchY = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: touch_start(touchX, touchY); invalidate(); break; case MotionEvent.ACTION_MOVE: touch_move(touchX, touchY); invalidate(); break; case MotionEvent.ACTION_UP: touch_up(); invalidate(); break; default: return false; } invalidate(); return true; } private void touch_start(float x, float y) { drawPoint = true; drawPath.reset(); drawPath.moveTo(x, y); drawCanvas.drawPath(drawPath, drawPaint); mX = x; mY = y; } private void touch_move(float x, float y) { float dx = Math.abs(x - mX); float dy = Math.abs(y - mY); if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { drawPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2); drawPoint = false; drawCanvas.drawPath(drawPath,drawPaint); mX = x; mY = y; }} private void touch_up() { if (drawPoint == true) { drawCanvas.drawPoint(mX, mY, drawPaint); Point p = new Point(); p.set((int) mX, (int) mY); points.add(p); pointcolor.add(drawPaint.getColor()); marker.add(0); } else { drawPath.lineTo(mX, mY); drawCanvas.drawPath(drawPath, drawPaint); paths.add(drawPath); drawPath = new Path(); drawPath.reset(); pathscolor.add(drawPaint.getColor()); marker.add(1); } } public void clear() { if (marker.size() > 0) { paths.clear(); points.clear(); pathscolor.clear(); pointcolor.clear(); invalidate(); } } public void undo() { if (marker.size() > 0) { if (marker.get(marker.size() - 1) == 1) { if (paths.size() > 0) { paths.remove(paths.size() - 1); pathscolor.remove(pathscolor.size() - 1); marker.remove(marker.size() - 1); invalidate(); } } else { if (points.size() > 0) { points.remove(points.size() - 1); pointcolor.remove(pointcolor.size() - 1); marker.remove(marker.size() - 1); invalidate(); } } } }}
