macOS OpenGL help!

[Blakeasd]

I am working on an example out of the OpenGL super bible and I am having some problems. I am trying to draw a rectangle/square on top of the background.
Here is my code:

- (void)drawRect:(NSRect)dirtyRect {
	//Clear the view with the current clearing color
	glClear(GL_COLOR_BUFFER_BIT);
	//Set the current drawing color to red
	//         R      G    B
	glColor3f(1.0f, 0.0f, 0.0f);
	//Draw a filled rectangle with the current color
	glRectf(-25.0f, 25.0f, 25.0f, -25.0f);
	//Flush drawing commands
	glFlush();
	//Set up the rendering state
	glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
}

This is not working however. The book suggests I should use GLUT for my interface, however I like Cocoa. Does anyone know why this code is not working?
Thanks
Blake

 

[robvas]

Define 'not working'

Doesn't compile? Runs but doesn't draw what you want?

Dumb question, but have you already initialized OpenGL elsewhere in your program?

 

[jared_kipe]

Dumb question, but have you already initialized OpenGL elsewhere in your program?

Not a dumb question, first thing I thought of.

This appears to be a subclass of NSView or some other NSView subclass. Generally one uses CGContext**** commands to draw in this method...

 

[robvas]

Here's an example from Apple

http://developer.apple.com/library/mac/#samplecode/CocoaGL/Introduction/Intro.html

 

[Blakeasd]

Yes, OpenGL is imported. The code works, but doesn't display the proper thing. It should display a small rectangle. It does not. I know the OpenGL is working because I can draw my background. Please help and thanks!

 

[Blakeasd]

Figured it out Thanks

 

[robvas]

Figured it out Thanks

What was the fix?

 

[Blakeasd]

I found a different way to do it

 

[holmesf]

Yes, OpenGL is imported. The code works, but doesn't display the proper thing. It should display a small rectangle. It does not. I know the OpenGL is working because I can draw my background. Please help and thanks!

Your projection or modelview matrix is wrong.