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计算屏幕点击处，和3D空间中的线段，在屏幕空间中的最短距离
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| //计算屏幕点击处，和3D空间中的线段，在屏幕空间中的最短距离 | |
| public static float DetectClickOnLine(Camera camera,Vector3 p1, Vector3 p2) | |
| { | |
| var v1 = camera.WorldToScreenPoint(p1); | |
| var v2 =camera.WorldToScreenPoint(p2); | |
| Vector2 point = Input.mousePosition; | |
| //计算点到直线的距离 | |
| var xDis = v2.x - v1.x; | |
| var yDis = v2.y - v1.y; | |
| var dx = point.x - v1.x; | |
| var dy = point.y - v1.y; | |
| var d = xDis * xDis + yDis * yDis; | |
| var t = xDis * dx + yDis * dy; | |
| if (d > 0) | |
| t /= d; | |
| if (t < 0) | |
| t = 0; | |
| else if (t > 1) | |
| t = 1; | |
| dx = v1.x + t * xDis - point.x; | |
| dy = v1.y + t * yDis - point.y; | |
| return Mathf.Sqrt(dx * dx + dy * dy); | |
| } | |
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