new helper methods

improved elememt-selection
changed some parameters
show length for selected obstacles/doors
minor fixes

mapview/2D/ClickDist.h

@@ -0,0 +1,59 @@
+#ifndef CLICKDIST_H
+#define CLICKDIST_H
+
+enum class ClickDistType {
+	UNKNOWN,
+	DIRECT,		// e.g. distance between cursor and an edge-point, POI, AP, Beacon, ...
+	CUT,		// e.g. distance between cursor and an obstacle-line
+};
+
+/** describes distances between mouse-cursor and objects within the 2D view */
+struct ClickDist {
+
+	/** distance in pixels */
+	float dst_px;
+
+	/** distance type */
+	ClickDistType type;
+
+
+	/** ctor */
+	ClickDist(const float dst_px, const ClickDistType type) : dst_px(dst_px), type(type) {;}
+
+	/** max-dummy */
+	static ClickDist max() {return ClickDist(9999999, ClickDistType::UNKNOWN);}
+
+
+	/** distance comparison */
+	bool operator < (const ClickDist o) const {
+		return (this->dst_px * this->mod()) < (o.dst_px * o.mod());
+	}
+
+	/** multiply by constant */
+	ClickDist operator * (const float val) const {return ClickDist(dst_px*val, type);}
+
+//	/** weighted distance comparison based on ClickDistType */
+//	bool compare(const ClickDist o) const {
+//		return ((*this)*mod()) < (o*o.mod());
+//	}
+
+private:
+
+	/**
+	 * artificially modify the distance based on the given type.
+	 * this enhances the selection in cases of equal distance
+	 * like a POI residing dirctly one a line
+	 */
+	float mod() const {
+		switch (type) {
+			case ClickDistType::UNKNOWN:	return 1.1;
+			case ClickDistType::CUT:		return 1.0;
+			case ClickDistType::DIRECT:		return 0.7;
+			default: throw "code error";
+		}
+	}
+
+};
+
+
+#endif // CLICKDIST_H