Revision e529379e
Added by Leszek Koltunski 11 months ago
| src/main/java/org/distorted/library/mesh/MeshPolygon.java | ||
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package org.distorted.library.mesh; |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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import org.distorted.library.main.DistortedLibrary; |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Create a polygon of any shape and varying elevations from the edges towards the center. |
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* <p> |
| ... | ... | |
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public class MeshPolygon extends MeshBase |
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{
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private static final int NUM_CACHE = 20; |
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private static final int SHAPE_DD = 0; |
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private static final int SHAPE_DU = 1; |
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private static final int SHAPE_UD = 2; |
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private static final int SHAPE_UU = 3; |
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private static final int SHAPE_DUD= 4; |
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private float[] mPolygonVertices; |
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private int mNumPolygonVertices; |
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private float[] mPolygonBands; |
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private int mNumPolygonBands; |
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private boolean[] mEdgeUp; |
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private boolean[] mVertUp; |
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private int remainingVert; |
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private int numVertices; |
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private int extraIndex, extraVertices;
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private int extraBand, extraVertices;
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private float[] mCurveCache; |
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private float mVecX, mVecY; |
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private int[] mEdgeShape; |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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// polygonVertices>=3 , polygonBands>=2 |
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private void computeNumberOfVertices() |
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{
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if( mNumPolygonBands==2 && extraIndex>0 )
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if( mNumPolygonBands==2 && extraBand>0 )
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{
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numVertices = 1 + 2*mNumPolygonVertices*(1+extraIndex+2*extraVertices);
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numVertices = 1 + 2*mNumPolygonVertices*(1+extraBand+2*extraVertices);
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} |
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else |
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{
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numVertices = (mNumPolygonVertices*mNumPolygonBands+2)*(mNumPolygonBands-1) - 1; |
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numVertices+= 2*mNumPolygonVertices*(2*extraIndex*extraVertices);
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numVertices+= 2*mNumPolygonVertices*(2*extraBand*extraVertices);
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} |
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remainingVert = numVertices; |
| ... | ... | |
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private float getSpecialQuot(int index) |
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{
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int num = 1 + extraIndex + 2*extraVertices;
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int num = 1 + extraBand + 2*extraVertices;
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int change1 = extraVertices+1; |
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int change2 = num-change1; |
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float quot = 1.0f/(extraIndex+1);
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float quot = 1.0f/(extraBand+1);
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if( index<change1 ) return index*quot/change1; |
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else if( index>change2 ) return 1-quot + (index-change2)*quot/change1; |
| ... | ... | |
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{
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if( isExtra ) |
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{
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int extra = extraIndex-band+extraVertices;
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int extra = extraBand-band+extraVertices;
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if( index < extra ) |
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{
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float quot = ((float)extraIndex-band)/(extra*num);
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float quot = ((float)extraBand-band)/(extra*num);
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return index*quot; |
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} |
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else if( index > num+2*extraVertices-extra ) |
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{
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float quot = ((float)extraIndex-band)/(extra*num);
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return (1.0f-((float)extraIndex-band)/num) + (index-num-2*extraVertices+extra)*quot;
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float quot = ((float)extraBand-band)/(extra*num);
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return (1.0f-((float)extraBand-band)/num) + (index-num-2*extraVertices+extra)*quot;
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} |
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else |
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{
|
| ... | ... | |
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return 1.0f; |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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private float computeZEdge(float quot) |
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{
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if( quot>=1.0f ) return 0.0f; |
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for(int band=1; band<mNumPolygonBands; band++) |
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{
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float curr = mPolygonBands[2*band]; |
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if( curr<=quot ) |
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{
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float prev = mPolygonBands[2*band-2]; |
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float prevH= mPolygonBands[2*band-1]; |
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float currH= mPolygonBands[2*band+1]; |
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float A = (prev-quot)/(prev-curr); |
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return A*currH + (1-A)*prevH; |
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} |
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} |
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return 0.0f; |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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private float derivative(float x) |
| ... | ... | |
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} |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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private void figureOutNormalVector2D(int edgeShape, int polyVertex, int polyEndVer, float quot, float xEdge, float yEdge ) |
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{
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if( edgeShape==SHAPE_DD ) |
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{
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if( quot<0.5f ) |
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{
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int p = polyVertex>0 ? polyVertex-1 : mNumPolygonVertices-1; |
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int prvShape = mEdgeShape[p]; |
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switch(prvShape) |
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{
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case SHAPE_DD : mVecX = xEdge; |
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mVecY = yEdge; |
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break; |
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case SHAPE_UD : |
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case SHAPE_DUD: float a = 2*quot; |
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float xCurr= mPolygonVertices[2*polyVertex ]; |
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float yCurr= mPolygonVertices[2*polyVertex+1]; |
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float xPrev= mPolygonVertices[2*p ]; |
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float yPrev= mPolygonVertices[2*p+1]; |
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float xVec = xCurr-xPrev; |
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float yVec = yCurr-yPrev; |
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mVecX = a*xEdge + (1-a)*xVec; |
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mVecY = a*yEdge + (1-a)*yVec; |
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break; |
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default: throw new RuntimeException("figureOutNormalVector2D: impossible1: "+prvShape);
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} |
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} |
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else |
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{
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int n = polyEndVer==mNumPolygonVertices-1 ? 0 : polyEndVer+1; |
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int nxtShape = mEdgeShape[polyEndVer]; |
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switch(nxtShape) |
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{
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case SHAPE_DD : mVecX = xEdge; |
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mVecY = yEdge; |
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break; |
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case SHAPE_DU : |
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case SHAPE_DUD: float a = 2-2*quot; |
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float xCurr= mPolygonVertices[2*polyEndVer ]; |
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float yCurr= mPolygonVertices[2*polyEndVer+1]; |
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float xNext= mPolygonVertices[2*n ]; |
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float yNext= mPolygonVertices[2*n+1]; |
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float xVec = xCurr-xNext; |
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float yVec = yCurr-yNext; |
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mVecX = a*xEdge + (1-a)*xVec; |
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mVecY = a*yEdge + (1-a)*yVec; |
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break; |
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default: throw new RuntimeException("figureOutNormalVector2D: impossible2: "+nxtShape);
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} |
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} |
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} |
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else if( edgeShape==SHAPE_UU || (quot>=0.5f && edgeShape==SHAPE_DU) || (quot<0.5f && edgeShape==SHAPE_UD) ) |
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{
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mVecX = 1; |
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mVecY = 0; |
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} |
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else |
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{
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float dx = mPolygonVertices[2*polyVertex ] - mPolygonVertices[2*polyEndVer ]; |
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float dy = mPolygonVertices[2*polyVertex+1] - mPolygonVertices[2*polyEndVer+1]; |
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if( quot<0.5 ) |
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{
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mVecX = dx; |
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mVecY = dy; |
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} |
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else |
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{
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mVecX = -dx; |
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mVecY = -dy; |
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} |
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} |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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private float figureOutDerivative(int edgeShape, int polyBand, float quot) |
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{
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if( edgeShape==SHAPE_DD ) |
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{
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return derivative(1-mPolygonBands[2*polyBand]); |
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} |
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if( edgeShape==SHAPE_UU || (quot>=0.5f && edgeShape==SHAPE_DU) || (quot<0.5f && edgeShape==SHAPE_UD) ) |
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{
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return 0; |
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} |
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float x = 1-mPolygonBands[2*polyBand]; |
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float q = quot>=0.5f ? 2-2*quot : 2*quot; |
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return derivative((1-x)*q+x); |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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private int addVertex(int vertex, int polyBand, int polyVertex, int polyEndVer, float quot, |
| ... | ... | |
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float xEdge = Xfirst + quot*(Xlast-Xfirst); |
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float yEdge = Yfirst + quot*(Ylast-Yfirst); |
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float zEdge; |
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float q = mPolygonBands[2*polyBand]; |
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float o = mPolygonBands[2*polyBand+1]; |
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float t = mPolygonBands[2*mNumPolygonBands-1]; |
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int shape = mEdgeShape[polyVertex]; |
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switch(shape) |
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{
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case SHAPE_DD : zEdge = 0.0f; break; |
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case SHAPE_UU : zEdge = t; break; |
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case SHAPE_DU : zEdge = quot>=0.5f ? t : computeZEdge(1-2*quot); break; |
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case SHAPE_UD : zEdge = quot<=0.5f ? t : computeZEdge(2*quot-1); break; |
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default : zEdge = quot<=0.5f ? computeZEdge(1-2*quot) : computeZEdge(2*quot-1); break; |
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} |
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float x = q*xEdge; |
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float y = q*yEdge; |
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float z = o + (t-o)*(zEdge/t);
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float z = mPolygonBands[2*polyBand+1];
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attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB ] = x; |
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attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB+1] = y; |
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attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB+2] = z; |
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figureOutNormalVector2D(shape, polyVertex, polyEndVer, quot, xEdge, yEdge); |
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float d = figureOutDerivative(shape,polyBand,quot); |
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float d = derivative(1-mPolygonBands[2*polyBand]); |
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float vx = d*mVecX;
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float vy = d*mVecY;
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float vz = mVecX*mVecX + mVecY*mVecY;
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float vx = d*xEdge;
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float vy = d*yEdge;
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float vz = xEdge*xEdge + yEdge*yEdge;
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float len = (float)Math.sqrt(vx*vx + vy*vy + vz*vz); |
| 360 | 210 |
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int index = VERT1_ATTRIBS*vertex + NOR_ATTRIB; |
| ... | ... | |
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if( polyBand>0 ) vertex = addVertex(vertex,polyBand,0,1,0,attribs1,attribs2); |
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} |
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boolean specialCase = mNumPolygonBands==2 && polyBand==0 && extraIndex>0;
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boolean isExtra = polyBand<extraIndex;
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int numPairs = specialCase ? extraIndex+1 : mNumPolygonBands-1-polyBand;
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boolean specialCase = mNumPolygonBands==2 && polyBand==0 && extraBand>0;
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boolean isExtra = polyBand<extraBand;
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int numPairs = specialCase ? extraBand+1 : mNumPolygonBands-1-polyBand;
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if( isExtra ) numPairs += 2*extraVertices; |
| 386 | 236 |
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int polyEndVer = polyVertex==mNumPolygonVertices-1 ? 0 : polyVertex+1; |
| ... | ... | |
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return vertex; |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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|
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private int computeEdgeShape(int curr) |
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{
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if( mEdgeUp==null || !mEdgeUp[curr] ) return SHAPE_DD; |
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int prev = (curr==0 ? mNumPolygonVertices-1 : curr-1); |
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int next = (curr==mNumPolygonVertices-1 ? 0 : curr+1); |
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boolean rd = ( !mEdgeUp[next] || mVertUp==null || !mVertUp[next] ); |
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boolean ld = ( !mEdgeUp[prev] || mVertUp==null || !mVertUp[curr] ); |
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return rd ? (ld ? SHAPE_DUD : SHAPE_UD) : (ld ? SHAPE_DU : SHAPE_UU); |
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} |
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|
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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|
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private void buildGrid(float[] attribs1, float[] attribs2) |
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{
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int vertex=0; |
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mEdgeShape = new int[mNumPolygonVertices]; |
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for(int polyVertex=0; polyVertex<mNumPolygonVertices; polyVertex++) |
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mEdgeShape[polyVertex] = computeEdgeShape(polyVertex); |
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|
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for(int polyBand=0; polyBand<mNumPolygonBands-1; polyBand++) |
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for(int polyVertex=0; polyVertex<mNumPolygonVertices; polyVertex++) |
| 438 | 268 |
vertex = createBandStrip(vertex,polyBand,polyVertex,attribs1,attribs2); |
| ... | ... | |
| 451 | 281 |
* From (1.0,Z[0]) (outer edge, its Z elevation) to (0.0,Z[K]) (the center, |
| 452 | 282 |
* its elevation). The polygon is split into such concentric bands. |
| 453 | 283 |
* Must be band[2*i] > band[2*(i+1)] ! |
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* @param edgeUp N booleans - one for each edge; the first connects vertices (0,1) and (2,3); |
|
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* then just like 'verticesXY', i.e. counterclockwise. |
|
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* If this is null, all edges are by default 'down'. |
|
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* 'Down' means that edge's Z is equal to 0; 'up' means that its Z, at least in its |
|
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* middle, is equal to the highest elevation in the middle of the mesh. |
|
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* If the 'previous' edge is also up, then the Z is up horizontally from its middle |
|
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* to the left vertex; else it goes down along the same function it goes along the bands. |
|
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* Same with the right half of the edge. |
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* @param vertUp N booleans - one for each vertex. The first is about vertex 0, then vertex 1, etc. |
|
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* If this is null or false, the vertex is down; otheerwise - it is 'up'. |
|
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* This is taken into account only in one case: if both edges the vertex is the end of |
|
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* are 'up', then the vertex can be 'up' or 'down'; otherwise - if at least one of |
|
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* those edges is 'down' - then the vertex must be 'down' as well and this is ignored. |
|
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* @param exIndex This and the next parameter describe how to make the mesh denser at the |
|
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* @param exBand This and the next parameter describe how to make the mesh denser at the |
|
| 468 | 285 |
* polyVertices. If e.g. exIndex=3 and exVertices=2, then 3 triangles of the |
| 469 | 286 |
* outermost band (and 2 triangles of the next band, and 1 triangle of the third |
| 470 | 287 |
* band) get denser - the 3 triangles become 3+2 = 5. |
| ... | ... | |
| 473 | 290 |
* all bands go to. |
| 474 | 291 |
* @param centerY Y coordinate of the center. |
| 475 | 292 |
*/ |
| 476 |
public MeshPolygon(float[] verticesXY, float[] bands, boolean[] edgeUp, boolean[] vertUp, int exIndex, int exVertices, float centerX, float centerY)
|
|
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public MeshPolygon(float[] verticesXY, float[] bands, int exBand, int exVertices, float centerX, float centerY)
|
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| 477 | 294 |
{
|
| 478 | 295 |
super(); |
| 479 | 296 |
|
| ... | ... | |
| 481 | 298 |
mPolygonBands = bands; |
| 482 | 299 |
mNumPolygonVertices= mPolygonVertices.length /2; |
| 483 | 300 |
mNumPolygonBands = mPolygonBands.length /2; |
| 484 |
mEdgeUp = edgeUp; |
|
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mVertUp = vertUp; |
|
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extraIndex = exIndex; |
|
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extraBand = exBand; |
|
| 487 | 302 |
extraVertices = exVertices; |
| 488 | 303 |
|
| 489 | 304 |
if( centerX!=0.0f || centerY!=0.0f ) |
| ... | ... | |
| 524 | 339 |
|
| 525 | 340 |
public MeshPolygon(float[] verticesXY, float[] bands, int exIndex, int exVertices) |
| 526 | 341 |
{
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| 527 |
this(verticesXY,bands,null,null,exIndex,exVertices,0.0f,0.0f);
|
|
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this(verticesXY,bands,exIndex,exVertices,0.0f,0.0f); |
|
| 528 | 343 |
} |
| 529 | 344 |
|
| 530 | 345 |
/////////////////////////////////////////////////////////////////////////////////////////////////// |
| ... | ... | |
| 534 | 349 |
*/ |
| 535 | 350 |
public MeshPolygon(float[] verticesXY, float[] bands) |
| 536 | 351 |
{
|
| 537 |
this(verticesXY,bands,null,null,0,0,0.0f,0.0f);
|
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this(verticesXY,bands,0,0,0.0f,0.0f); |
|
| 538 | 353 |
} |
| 539 | 354 |
|
| 540 | 355 |
/////////////////////////////////////////////////////////////////////////////////////////////////// |
Also available in: Unified diff
We no longer need to support 'edgesUp' in MeshPolygons.