Revision 216c5526
Added by Leszek Koltunski over 4 years ago
| src/main/java/org/distorted/magic/RubikSurfaceView.java | ||
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private Static4D quatFromDrag(float dragX, float dragY) |
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{
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float axisX = dragY; // inverted X and Y - rotation axis is |
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float axisY = dragX; // perpendicular to (dragX,dragY) Why not (-dragY, dragX) ? because Y axis is also inverted!
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float axisX = dragY; // inverted X and Y - rotation axis is perpendicular to (dragX,dragY)
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float axisY = dragX; // Why not (-dragY, dragX) ? because Y axis is also inverted! |
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float axisZ = 0; |
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float axisL = (float)Math.sqrt(axisX*axisX + axisY*axisY + axisZ*axisZ); |
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| ... | ... | |
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axisY /= axisL; |
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axisZ /= axisL; |
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float cosA = (float)Math.cos(axisL*Math.PI/mScreenMin); |
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float ratio = axisL/mScreenMin; |
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ratio = ratio - (int)ratio; // the cos() is only valid in (0,Pi) |
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float cosA = (float)Math.cos(Math.PI*ratio); |
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float sinA = (float)Math.sqrt(1-cosA*cosA); |
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return new Static4D(axisX*sinA, axisY*sinA, axisZ*sinA, cosA); |
Also available in: Unified diff
RubikCube: fix dragging.