How to draw a triangle, a star, a square or a heart on the canvas?

Question

I am able to draw a circle and a rectangle on canvas by using
path.addCircle()

and

path.addRect().

And now I am wondering how to draw a triangle or a star or a square or a heart?

Answer 1

You have to find out the math behind that figures. The triangle and the star are quite easy to draw. Here is how you can draw a heart: http://www.mathematische-basteleien.de/heart.htm

To draw special paths you should create them by adding points, ellipses etc. The canvas supports a clipping mask of a specified path, so you can set the clipping mask of a heart, push the paths to the matrix, draw the content of the heart, and then pop it again.

That's what I'm doing to achieve a simulated 2D page curl effect on andriod: http://code.google.com/p/android-page-curl/

Hope this helps!