How to start fresh on canvas ?

Question

In my app I am drawing many things on canvas. Before I draw a new figure I want to remove all the previous drawings and start afresh.

In other words I want to perform a NEW-operation as we do it in MS-Paint with a fresh canvas, nothing drawn on it.

How can I achieve such funstionality ? Please help.

You could just remove the bitmaps that are currently on the screen by making the bitmaps null, or making a new canvas and put no draw commands after it. I guess it depends on how your code is as well, because I have set up a method to clear images from the screen — kabuto178, Dec 18 '12 at 12:26

score 1 · Accepted Answer · answered Dec 18 '12 at 12:50

The best way to do it is to draw a desired starting color onto your entire canvas. If you want to to be clear, as origionally.

myCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);

Or if you want a white background like MSPaint

myCanvas.drawColor(Color.WHITE); // Will accept any color.

score 0 · Answer 2 · edited May 23 '17 at 11:48

0

If you want to clear the Canvas, you can do this:

            protected void onDraw(Canvas canvas) {

                    ...
                    canvas.drawBitmap(fundo, 0, 0, null);
                    ...

In this case, I am drawing the back scene again, but you can "clear" the canvas too using

Canvas.drawColor(Color.BLACK)

Please see this post

edited May 23 '17 at 11:48

Community

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answered Dec 18 '12 at 12:39

cleuton

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How to start fresh on canvas ?

2 Answers2