Android bitmap size and size

Question

I have a PNG image that I am editing in Inkscape. This is an irregular, jagged shape, but I need to make a collision detection with it. It is too large to make a coarse sound around it (it takes up more than a standard phone screen). So I draw rectangles in INkscape around it and marking the pixel sizes of these rectangles.

I intend to use a combination of these “imaginary” rectangles to detect collisions. However, my efforts fell into the trap. By default, the size of the image on the phone is different from the size of Inkscape.

I want to know the best way to detect collisions with a large irregular object and / or how to make the dimensions of the canvas bitmap the same as the measurements of its pixel (or mm).

Answer 1

I suggest creating an equivalent image in which you define your collision zone with a value of 1, and the area without collisions with a value of 0 (or 0 and 255).

So, you will have two images, colorful that you see, and a collision image that you will upload to.

Then you can find out if you are in the collision zone with:

Bitmap collision; collision = BitmapFactory.decodeStream(...yourImage...); collision.getPixel(x,y) 

Another solution is to create two arrays after processing the collision image, you can do this by creating a Java application that processes the original image and creates a text file with two lines, the first line is the x coordinate, and the second line is the y pair.

Then read this file in your Android application, and if your x and y exist in this array, this is the collision point.