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- package de.tu_darmstadt.informatik.tk.scopviz.main;
- import java.util.Iterator;
- import org.graphstream.algorithm.Toolkit;
- import org.graphstream.graph.Edge;
- import org.graphstream.graph.Node;
- import org.graphstream.ui.geom.Point3;
- import org.graphstream.ui.view.Camera;
- /**
- * This class contains helpful static functions.
- *
- * @author Matthias Wilhelm
- *
- */
- public class AuxilFunctions {
- /**
- * Width in pixel for which the edge selection triggers
- */
- private static final int EDGE_SELECTION_WIDTH = 5;
- /**
- * Recalculates pi / 2
- */
- private static final double HALF_PI = Math.PI / 2;
- /**
- * Returns the closest Edge in the current Graph to a given position. It
- * allows for an inaccuracy of around {@value #EDGE_SELECTION_WIDTH}px
- *
- * @param pos
- * The position. Expects a <b>Point3</b>, but only uses the x and
- * y coordinates
- * @return the closest Edge if a valid Edge exists, returns <b>null</b>
- * otherwise
- */
- public static Edge getClosestEdge(Point3 pos) {
- Camera cam = Main.getInstance().getGraphManager().getView().getCamera();
- Point3 min = cam.transformPxToGu(0, 0);
- Point3 max = cam.transformPxToGu(EDGE_SELECTION_WIDTH, EDGE_SELECTION_WIDTH);
- double dist = Math.max(Math.abs(max.x - min.x), Math.abs(max.y - min.y));
- return getClosestEdge(pos, dist);
- }
- /**
- * Returns the closest Edge in the current Graph to a given position within
- * the given maxDistance
- *
- * @param pos
- * The position. Expects a <b>Point3</b>, but only uses the x and
- * y coordinates
- * @param maxDistance
- * the maximum distance (in gu) the edge may be away from the
- * position to be considered as a valid edge
- * @return the closest Edge if a valid Edge exists, returns <b>null</b>
- * otherwise
- */
- public static Edge getClosestEdge(Point3 pos, double maxDistance) {
- double x0 = pos.x;
- double y0 = pos.y;
- double dist = maxDistance;
- Edge result = null;
- GraphManager gm = Main.getInstance().getGraphManager();
- for (Iterator<Edge> iterator = gm.getGraph().getEdgeIterator(); iterator.hasNext();) {
- Edge edge = (Edge) iterator.next();
- double[] n1 = Toolkit.nodePosition(edge.getNode0());
- double[] n2 = Toolkit.nodePosition(edge.getNode1());
- double x1 = n1[0];
- double y1 = n1[1];
- double x2 = n2[0];
- double y2 = n2[1];
- double a = distance(x0, y0, x2, y2);
- double b = distance(x0, y0, x1, y1);
- double c = distance(x1, y1, x2, y2);
- double b2 = b * b;
- double a2 = a * a;
- double c2 = c * c;
- double cdist = Math.abs((y2 - y1) * x0 - (x2 - x1) * y0 + x2 * y1 - y2 * x1) / c;
- double alpha = Math.acos((b2 + c2 - a2) / (2 * b * c));
- double beta = Math.acos((a2 + c2 - b2) / (2 * a * c));
- if (cdist < dist && alpha <= HALF_PI && beta <= HALF_PI) {
- dist = cdist;
- result = edge;
- }
- }
- return result;
- }
- /**
- * Calculates the distance between two given Nodes
- *
- * @param a
- * Node 1
- * @param b
- * Node 2
- * @return the distance between the two Nodes as a double
- */
- public static double distance(Node a, Node b) {
- double[] n1 = Toolkit.nodePosition(a);
- double[] n2 = Toolkit.nodePosition(b);
- return distance(n1[0], n1[1], n2[0], n2[1]);
- }
- /**
- * Calculates the distance between a x,y position and a Node
- *
- * @param x0
- * x cord of the position
- * @param y0
- * y cord of the position
- * @param a
- * the Node
- * @return the distance between the position and the Node as a double
- */
- public static double distance(double x0, double y0, Node a) {
- double[] n1 = Toolkit.nodePosition(a);
- return distance(x0, y0, n1[0], n1[1]);
- }
- /**
- * Calculates the distance between two x,y positions
- *
- * @param x0
- * x cord of the first position
- * @param y0
- * y cord of the first position
- * @param x1
- * x cord of the second position
- * @param y1
- * y cord of the second position
- * @return the distance between the two positions as a double
- */
- public static double distance(double x0, double y0, double x1, double y1) {
- return Math.sqrt(Math.pow(y0 - y1, 2) + Math.pow(x0 - x1, 2));
- }
- }
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