Understanding how actually drawRect or drawing coordinates work in Android

Question

I am trying to draw a rectangle over a canvas and I am facing troubles to understand the in-depth of rectangle draw of Android. I\'ve read tutorials and every possible but I

Answer 1

canvas.drawRect(left,top,right,bottom,paint);

In this

1. left: distance of the left side of rectangular from left side of canvas.

2. top:Distance of top side of rectangular from the top side of canvas

3. right:distance of the right side of rectangular from left side of canvas.
4. bottom: Distance of the bottom side of rectangle from top side of canvas.