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Java example source code file (DiagramConnectionWidget.java)

This example Java source code file (DiagramConnectionWidget.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, awt, basicstroke, color, connection, connectionwidget, diagramconnectionwidget, diagramscene, figure, graphics2d, list, override, point, rectangle, util, white_factor

The DiagramConnectionWidget.java Java example source code

/*
 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */
package com.sun.hotspot.igv.view.widgets;

import com.sun.hotspot.igv.graph.Connection;
import com.sun.hotspot.igv.graph.Figure;
import com.sun.hotspot.igv.view.DiagramScene;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Stroke;
import java.util.ArrayList;
import java.util.List;
import org.netbeans.api.visual.anchor.AnchorShape;
import org.netbeans.api.visual.model.ObjectState;
import org.netbeans.api.visual.widget.ConnectionWidget;
import org.netbeans.api.visual.widget.Scene;

/**
 *
 * @author Thomas Wuerthinger
 */
public class DiagramConnectionWidget extends ConnectionWidget {

    private static Stroke DASHED_STROKE = new BasicStroke(
            1,
            BasicStroke.CAP_BUTT,
            BasicStroke.JOIN_ROUND,
            0,
            new float[]{2},
            0);
    private static Stroke NORMAL_STROKE = new BasicStroke(1);
    private static Stroke BOLD_STROKE = new BasicStroke(3);
    public static int WHITE_FACTOR = 5;
    private Connection connection;
    private Color color;
    private Point lastSourceAnchor;
    private Point lastTargetAnchor;
    private List<Point> controlPoints;
    private Rectangle clientArea;
    private boolean split;
    private int[] xPoints;
    private int[] yPoints;
    private int pointCount;

    /** Creates a new instance of ConnectionWidget */
    public DiagramConnectionWidget(Connection connection, Scene scene) {
        super(scene);
        this.connection = connection;
        color = connection.getColor();
        if (connection.getStyle() == Connection.ConnectionStyle.DASHED) {
            this.setStroke(DASHED_STROKE);
        } else if (connection.getStyle() == Connection.ConnectionStyle.BOLD) {
            this.setStroke(BOLD_STROKE);
        } else {
            this.setStroke(NORMAL_STROKE);
        }
        this.setCheckClipping(true);
        clientArea = new Rectangle();
        updateControlPoints();
    }

    public Connection getConnection() {
        return connection;
    }

    public void updateControlPoints() {
        List<Point> newControlPoints = connection.getControlPoints();
        Connection c = connection;
        Figure f = c.getInputSlot().getFigure();
        Point p = new Point(f.getPosition());
        p.translate(c.getInputSlot().getRelativePosition().x, f.getSize().height / 2);
        Point p4 = new Point(f.getPosition());
        p4.translate(c.getInputSlot().getRelativePosition().x, c.getInputSlot().getRelativePosition().y);

        Figure f2 = c.getOutputSlot().getFigure();
        Point p2 = new Point(f2.getPosition());
        p2.translate(c.getOutputSlot().getRelativePosition().x, f2.getSize().height / 2);
        Point p3 = new Point(f2.getPosition());
        p3.translate(c.getOutputSlot().getRelativePosition().x, c.getOutputSlot().getRelativePosition().y);

        /*if(controlPoints.size() >= 2) {
        String className = Preferences.userNodeForPackage(PreferenceConstants.class).get(PreferenceConstants.KEY_LINE_GENERATOR, PreferenceConstants.DEFAULT_LINE_GENERATOR);
        try {
        LineGenerator lg = (LineGenerator)Class.forName(className).newInstance();
        controlPoints = lg.createLine(controlPoints, p2, p);
        } catch (InstantiationException ex) {
        } catch (IllegalAccessException ex) {
        } catch (ClassNotFoundException ex) {
        }
        }*/

        this.controlPoints = newControlPoints;
        pointCount = newControlPoints.size();
        xPoints = new int[pointCount];
        yPoints = new int[pointCount];
        int minX = Integer.MAX_VALUE;
        int maxX = Integer.MIN_VALUE;
        int minY = Integer.MAX_VALUE;
        int maxY = Integer.MIN_VALUE;
        split = false;
        for (int i = 0; i < pointCount; i++) {
            if (newControlPoints.get(i) == null) {
                split = true;
            } else {
                int curX = newControlPoints.get(i).x;
                int curY = newControlPoints.get(i).y;
                this.xPoints[i] = curX;
                this.yPoints[i] = curY;
                minX = Math.min(minX, curX);
                maxX = Math.max(maxX, curX);
                minY = Math.min(minY, curY);
                maxY = Math.max(maxY, curY);
            }
        }

        this.clientArea = new Rectangle(minX, minY, maxX - minX, maxY - minY);
    }

    @Override
    protected void paintWidget() {
        Graphics2D g = this.getGraphics();

        if (xPoints.length == 0 || Math.abs(xPoints[0] - xPoints[xPoints.length - 1]) > 2000) {
            return;
        }

        //g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
        //g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
        //g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);

        DiagramScene ds = (DiagramScene) this.getScene();
        boolean shouldHide = false;//ds.getShouldHide(this);

        Composite oldComposite = null;
        if (shouldHide) {
            Color c = new Color(255 - (255 - color.getRed()) / WHITE_FACTOR, 255 - (255 - color.getGreen()) / WHITE_FACTOR, 255 - (255 - color.getBlue()) / WHITE_FACTOR);
            g.setPaint(c);
        } else {
            g.setPaint(color);
        }

        if (split) {
            for (int i = 1; i < controlPoints.size(); i++) {
                Point prev = controlPoints.get(i - 1);
                Point cur = controlPoints.get(i);
                if (cur == null || prev == null) {
                    continue;
                }

                g.drawLine(prev.x, prev.y, cur.x, cur.y);
            }
        } else {
            g.drawPolyline(xPoints, yPoints, pointCount);
        }

        /*for(int i=0; i<xPoints.length; i++) {
        int x = xPoints[i];
        int y = yPoints[i];
        g.fillOval(x - 2, y - 2, 4, 4);
        }*/

        if (xPoints.length >= 2) {
            Graphics2D g2 = (Graphics2D) g.create();
            int xOff = xPoints[xPoints.length - 2] - xPoints[xPoints.length - 1];
            int yOff = yPoints[yPoints.length - 2] - yPoints[yPoints.length - 1];
            if (xOff == 0 && yOff == 0 && yPoints.length >= 3) {
                xOff = xPoints[xPoints.length - 3] - xPoints[xPoints.length - 1];
                yOff = yPoints[yPoints.length - 3] - yPoints[yPoints.length - 1];
            }
            g2.translate(xPoints[xPoints.length - 1], yPoints[yPoints.length - 1]);
            g2.rotate(Math.atan2(yOff, xOff));

            g2.scale(0.55, 0.80);
            AnchorShape.TRIANGLE_FILLED.paint(g2, false);
        }
    }

    @Override
    public void notifyStateChanged(ObjectState previousState, ObjectState state) {

        if (previousState.isHovered() != state.isHovered()) {
            color = connection.getColor();
            if (state.isHovered()) {
                this.setStroke(BOLD_STROKE);
            } else {
                this.setStroke(NORMAL_STROKE);
            }

            if (state.isHovered()) {
                this.setStroke(BOLD_STROKE);
            } else {
                this.setStroke(NORMAL_STROKE);
            }

            repaint();
        }
        super.notifyStateChanged(previousState, state);
    }

    @Override
    public List<Point> getControlPoints() {
        if (split) {
            ArrayList<Point> result = new ArrayList();
            for (Point p : controlPoints) {
                if (p != null) {
                    result.add(p);
                }
            }
            return result;
        } else {
            return controlPoints;
        }
    }

    @Override
    public String toString() {
        return "ConnectionWidget[" + connection + "]";
    }

    @Override
    protected Rectangle calculateClientArea() {
        Rectangle result = new Rectangle(clientArea);
        result.grow(10, 10);
        return result;
    }
}

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