June 2013
Intermediate to advanced
346 pages
8h 42m
English
Content preview from OpenGL ES 2 for Android
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Moving Around an Object by Dragging
Now that we’re able to test if the mallet has been touched, we’ll work on solving the next part of the puzzle: Where does the mallet go when we drag it around? We can think of things in this way: the mallet lies flat on the table, so when we move our finger around, the mallet should move with our finger and continue to lie flat on the table. We can figure out the right position by doing a ray-plane intersection test.
Let’s complete the definition for handleTouchDrag:
| AirHockeyTouch/src/com/airhockey/android/AirHockeyRenderer.java | |
| | public void handleTouchDrag(float normalizedX, float normalizedY) { |
| | if (malletPressed) { |
| | Ray ray = convertNormalized2DPointToRay(normalizedX, normalizedY); |
| | // Define ... |
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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