Android: Custom view Zoom/Pinch

Question

I've a running graph library developed with onDraw plotting the graph using canvas.drawLine methods. In onTouch I've implemented scroll functionality.

Now my customer wants Zoom/Pinch. Is it possible to perform zoom/pinch on such a view without redrawing for these operations?

What is the best way to implement this?

Now next.. How can I display Zooming indicators for this?? I've some how managed to display scale of zoom (scaleFactor * 100). How will I show a zooming indicator? I can display static images using canvas.drawBitmap. But is there a more better way?

Any help is appreciated

Hey! Ramya, have you implemente scroll and zoom on your graph? — Vijju, Mar 01 '16 at 07:34
Yes. Long time back. I had mostly got the logic from Vinayak's comment/reference link — Ramya K Sharma, Mar 02 '16 at 05:18

score 2 · Accepted Answer · edited May 23 '17 at 12:15

2

Add a pinch zoom capability to the graph:

How to implement pinch zoom refer : android pinch zoom

edited May 23 '17 at 12:15

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answered Jul 19 '11 at 10:53

Vinayak Bevinakatti

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Android: Custom view Zoom/Pinch

1 Answers1