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I have a work to calculate the diameter vertical and horizontal of an ellipse to determine the value of the cup to disk ratio of glaucoma. from the journal was im read, they are using fit ellipse methode. How might I do that?
You can try to fit an ellipse using the Hough Transform.
But you can also find what you want using:
PCA => it will give you the main and secondary axises.
Moments
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Here is the problems
wireframe
It looks like depth buffer overlap problem. I think your scales are way off, and your depth buffer is not properly utilized. Probably you should focus on scale of your triangles and how far away to put the camera.
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I need a Rubiks cube generator for my project. I searched a lot but I only found websites that provide me a scramble but do not provided a method/function to do so. Is there a way for me to make my own or is an algorithm already available. Thanks
Find yourself a way how to represent the cube (each side and each cell of a side)
Determine, how your representation changes when rotating a horizontal section once clockwise and how your representation changes when rotating a vertical section once clockwise.
n times, randomly select a horizontal or vertical section and rotate it once clockwise.
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I want do something like in this post but a more advanced version of that..
I want to also change image when mouse drag distance is not in some user defined range than want to change image in canvas, check if mouse move point is between those two circles (not less or greater).
You didn't provide code in your question, so here is a non-code answer:
You can use Math.atan2 to get the angle of the mouseclick and apply that same angle to your image.
You can use pythagora's theorm to determine the distance from the click to the image center. Then test if that distance is between your 2 circles' radii.
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I draw a graphical primitives using functions ccDraw... and I need to calc for example a scale and transition using 3x3 matrices.
How to solve this issue in cocos2d? I can't simply use sprites/nodes because all the calculated points belong to the same object. Is it possible without converting CGPoint->matrix->CGPoint?
It sounds like you are trying to do scale/rotation on the CGPoints. You can do this using CGAffineTransform functions and structure that are part of Quartz 2D.
See these references:
Apple's Documents.
A single example of rotating a rectangle formed by four points.
SO Example(s).
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Okay, I'm trying to write a program that could tell me if any points in a 30x100 rectangle rotated to 140 degrees are inside another 30x100 rectangle rotated to 200 degrees.
Honestly, I don't even know where to start. I thought about re-rotating them before doing normal calculations, but than they still wouldn't match up.
How can I do this?