Zoom out zoom in bitmap or canvas

Question

I am new in Android and I want to make zoom out and zoom in on canvas or bitmap. I made draw app and than i want to make zoom out and zoom in picture which I have drawn. Can any one suggest me?

I want to zoom:

private Bitmap mBitmap;
private Canvas mCanvas;

How do I make "layer drawing"?

It's not really clear exactly what you want to do. Would it work to use Canvas.scale() method before you painted your bitmap on it? — Albin, Sep 19 '12 at 08:49
there are many examples out there for what you want to make. You have to create a custom view that draws the bitmap and then mess with scale and translate. I googled and found this http://android-er.blogspot.in/2010/07/skew-bitmap-image-using-matrix.html — weakwire, Sep 19 '12 at 08:56
i saw that but i dont need this. I want prass with two fingers and i want move it together than my picture wich i draw make bigger or make smaller — , Sep 19 '12 at 09:03
then search for pinch to zoom android example or something.I don't think anyone will give you a full working example. Just references clues or solution to specific problems — weakwire, Sep 19 '12 at 09:14
yes i know .. but i saw this : http://stackoverflow.com/questions/2537238/how-can-i-get-zoom-functionality-for-images — , Sep 19 '12 at 09:55

score 0 · Answer 1 · answered Sep 19 '12 at 09:02

use Canvas api

scale(float sx, float sy)
    Preconcat the current matrix with the specified scale.

drawBitmap(int[] colors, int offset, int stride, float x, float y, int width, int height, boolean hasAlpha, Paint paint)
    Treat the specified array of colors as a bitmap, and draw it.

Zoom out zoom in bitmap or canvas

1 Answers1