给定正方形的位置和尺寸,JavaScript中用于测试直线是否穿过矩形的方程是什么?
到目前为止,我尝试过的是:
function isSquareIntersectingLine(square, line) {
return (
line.startX >= square.topLeftX &&
line.startX <= square.topLeftX + square.width &&
line.endX >= square.topLeftX + square.width
);
}
如果尺寸为:
Square: {topLeftX: 0, topLeftY: 0, width: 5, height: 5}
Line: {startX: 2, startY: -4, endX: 6, endY: 3}
但是,如果尺寸是这样的,它将无法正常工作:
Square: {topLeftX: 0, topLeftY: 0, width: 5, height: 5}
Line: {startX: 2, startY: -4, endX: 3, endY: 10}
检查线段是否与JavaScript中的正方形相交的正确公式是什么?
最佳答案
使用Cohen-Sutherland clipping algorithm(或另一个line clipping)
获取段两端的代码并检查:
if both codes are zero, segment is inside (A-B case)
if code1 & code2 != 0 segment is outside (K-L case)
if code1 & code2 = 0, analyze codes
zero-nonzero: intersection exists (C-D)
if code1 | code2 = 1100, 0011 : intersection exists (E-F)
otherwise check for intersections with edges (GH)
关于javascript - 检查正方形是否与JavaScript中的线相交,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/53908349/