我有一个存储为点的路径,位于数组列表中,我想检查线段是否相交.由于某些未知原因,它不起作用!尽管我正在绘制相交的形状,但在LogCat中没有收到任何消息.了解是否有人可以看到我做错了什么或对如何改进代码提出建议.
// Intersection control if(touchActionUp) { // Loop throw all points except the last 3 for (int i = 0; i < points.size()-3; i++) { line line1 = new line(points.get(i), points.get(i+1)); // Begin after the line above and check all points after that for (int j = i + 2; j < points.size()-1; j++) { line line2 = new line(points.get(j), points.get(j+1)); // Call method to check intersection if(checkIntersection(line1, line2)) { Log.i("Intersection", "Yes!"); } } } }
和方法:
// Method to check for intersection between linesprivate boolean interceptionControl(line line1, line line2) { int x1 = line1.pointX1; int x2 = line1.pointX2; int x3 = line2.pointX1; int x4 = line2.pointX2; int y1 = line1.pointY1; int y2 = line1.pointY2; int y3 = line2.pointY1; int y4 = line2.pointY2; // Check if lines are parallel int denom = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1); if(denom == 0) { // lines are parallel // ?? } double a = ((x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3)) / denom; double b = ((x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3)) / denom; // Check for intersection if( a >= 0.0f && a <= 1.0f && b >= 0.0f && b <= 1.0f) { return true; } return false;}
解决方法:
您将int用于坐标,因此它进行整数除法(即3/2 = 1).这可能是您用标度除以的原因.您可以通过除以((double)denom)而不是简单的denom来解决它.
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