clearRect() on Canvas

Drag the sliders to change the X, Y postion and height width values for the clear rectangle.
void gctx.clearRect(x, y, width, height );
x: Position from left edge of the canvas,
y: Position from Top edge of the canvas,
width : Width of the rectangle.
height : Height of the rectangle.

To clear full canvas
gctx.clearRect(0, 0, my_canvas.width,my_canvas.height);
Code to clear part of the Canvas.
var my_canvas=$('#my_canvas').get(0)
var gctx = my_canvas.getContext("2d");


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