if(yy>y1){yy=y1+(xx-x1)/aspect;}else{yy=y1-(xx-x1)/aspect;}}else if(xx<x1){if(x1-xx<min_x){xx=x1-min_x}else if(x1-xx>max_x){xx=x1-max_x;}
if(yy>y1){yy=y1+(x1-xx)/aspect;}else{yy=y1-(x1-xx)/aspect;}}