Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I am trying to develop a drawing/painting app for my portfolio.
The functions I have now are “Write”, “Change Size”, and “Change Color”.
Now, I am trying to implement an eraser tool that will totally erase what’s written. What I did so far was copy the same code I used for writing, using white as the color, but instead of erasing what’s written it just overwrites the first one. Is that the right way, or is there another way to implement this?
I don’t honestly know too much about OpenGL as of this writing, but I suspect that painting over with white is the wrong thing to do. Consider what happens if you decide to allow users to change the background color. The your code gets a little more complicated. What if you decide to add support for gradients?
I suggest finding a way to simply clear the data at a given point, for example, where your brush is. You might want to look at an open source graphics program, like GIMP, to see how they do it.