CODEWITHSUNDEEP
iosobjective-canimationopengl-es
Yifan Hong
Yifan Hong

Reputation: 41

Objective-C OpenGL Animation in Sample GLPaint code

I am digging into the sample project created by Apple: https://developer.apple.com/library/ios/samplecode/GLPaint/Introduction/Intro.html

It demonstrates how to use OpenGL in Objective-C.

When I start the app a "SHAKE ME" graph is drawn stroke by stroke, with animation. As I want to modify this project to make my own app, in PaintingView.m, I want to know how to disable the animation whenever I call the renderLineFromPoint:toPoint: method (specifically, in the playback: function, because in touchesMoved:withEvent: the animation is unnoticeable).

That is, I want to write a renderLineFromPoint:toPoint:animated: method such that, if I put NO after animated:, the line would be drawn instantly.

Upvotes: 1

Views: 207

Answers (1)

Yifan Hong
Yifan Hong

Reputation: 41

Found it.

All I have to do is, in 

- (void)renderLineFromPoint:(CGPoint)start toPoint:(CGPoint)end

silence the two lines at the end:

// Display the buffer
// glBindRenderbuffer(GL_RENDERBUFFER, viewRenderbuffer);
// [context presentRenderbuffer:GL_RENDERBUFFER];

And after the whole graph are drawn onto the buffer, call this two lines to display the whole graph; it will appear instantly.

Upvotes: 1

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