How to determine coordinates of touch event on an imageview which has an arc and rectangle in Android

Asked May 23 '16 at 07:34

Active May 23 '16 at 11:53

Viewed 53 times

I have the following shape-image

I want to validate my touch events when I touch in the blue area or not in my imageview. I need to combine the arc and the rectangle as one and validate the coordinates of the touch event?

I use this if it was a circle

private boolean isIn3PointArea(float touchX, float touchY, float centerX, float centerY, double r){
    float x = touchX - centerX;
    float y = touchY - centerY;
    return (touchY < centerY && Math.sqrt(x*x+y*y) > r);
}

edited May 23 '16 at 11:53

asked May 23 '16 at 07:34

Miaoulis Nikos

1

This is more of a math problem than programming. – Nanoc May 23 '16 at 11:49
can I combine the coordinates of both shapes the rect and the arc ? – Miaoulis Nikos May 23 '16 at 11:50
1

Or: get touch coordinates, get ImageView bitmap cache, call bitmap.getPixel(x,y) and verify it is *blueish*. – natario May 23 '16 at 11:53
any example of that? – Miaoulis Nikos May 23 '16 at 12:08
something like that http://stackoverflow.com/questions/7807360/how-to-get-pixel-colour-in-android – Miaoulis Nikos May 23 '16 at 12:10
If you are sure of the color @mvai solution its the easiest. – Nanoc May 23 '16 at 14:25

How to determine coordinates of touch event on an imageview which has an arc and rectangle in Android

0 Answers0