- double area = fabs (_points[0].x * (_points[0].y - p.y)) +
- (_points[1].x * (p.y - _points[0].y)) +
- (p.x * (_points[0].y - _points[1].y));
+ a.x = min (a.x, visible.x1);
+ a.y = min (a.y, visible.y1);
+ b.x = min (b.x, visible.x1);
+ b.y = min (b.y, visible.y1);
+
+ double d = distance_to_segment_squared (p, a, b, t, at);
+
+ if (t < 0.0 || t > 1.0) {
+ return false;
+ }