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1103     double delA,delB,delX,delY;
1123     delA =  (ey1-ey2)*(ex1-px1) + (ex1-ex2)*(py1-ey1);
1126     alpha = delA / del;
3421     double delA,delB,delX,delY;
3440     delA =  (px1-ex1)*(py1-py2) + (ey1-py1)*(px1-px2);
3443     alpha =  delA / del;
3468     double delA,delB,delX,delY;
3487     delA =  (px1-ex1)*(py1-py2) + (ey1-py1)*(px1-px2);
3490     alpha =  delA / del;
3513     double delX,delY,delA;
3530     delA = - c - a*px1 - b*py1;
3531     alpha = delA / del;