ZyEdgeLabel.java

/*
Copyright 2011-2016 Google Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.google.security.zynamics.zylib.yfileswrap.gui.zygraph.realizers;

import com.google.common.base.Preconditions;
import com.google.security.zynamics.zylib.gui.zygraph.realizers.ZyLabelContent;

import y.layout.LabelLayoutConstants;
import y.view.EdgeLabel;

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;

/**
 * Edge label class that is used to display edge comments.
 */
public class ZyEdgeLabel extends EdgeLabel {
  private static final int SHADOW_SIZE = 5;

  private static Color m_backGroundColor = new Color(250, 250, 255);
  private static Color borderColor = Color.BLACK;

  private final ZyLabelContent m_content;

  private final int m_roundedHeight;

  private final int m_roundedWidth;

  private final double m_height;

  private final double m_width;

  public ZyEdgeLabel(final ZyLabelContent content) {

    m_content = Preconditions.checkNotNull(content);

    setVisible(true);
    setText("A"); // Dummy; don't remove

    setModel(EdgeLabel.CENTERED);
    setPreferredPlacement(LabelLayoutConstants.PLACE_ON_EDGE);
    setPosition(EdgeLabel.CENTER);

    m_height = getHeight();
    m_width = getWidth();

    m_roundedHeight = (int) m_height;
    m_roundedWidth = (int) m_width;
  }

  @Override
  protected void paintBox(final Graphics2D gfx, final double x, final double y,
      final double width1, final double height2) {

    // final Graph2D g = (Graph2D) this.getEdge().getGraph();

    final int roundedX = (int) (x - (m_width / 2));
    final int roundedY = (int) (y - (m_height / 2));

    final BasicStroke oldStroke = (BasicStroke) gfx.getStroke();
    gfx.setStroke(new BasicStroke(oldStroke.getLineWidth()));

    gfx.setColor(m_backGroundColor);

    gfx.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.80f));
    gfx.fillRoundRect(roundedX, roundedY, m_roundedWidth, m_roundedHeight, 5, 5);
    gfx.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.95f));

    gfx.setColor(borderColor);
    gfx.drawRoundRect(roundedX, roundedY, m_roundedWidth, m_roundedHeight, SHADOW_SIZE, SHADOW_SIZE);
    gfx.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1.00f));

    gfx.setStroke(oldStroke);
  }

  @Override
  protected void paintContent(final Graphics2D gfx, final double x, final double y,
      final double width1, final double height1) {
    final int roundedX = (int) (x - (m_width / 2));
    final int roundedY = (int) (y - (m_height / 2));

    m_content.draw(gfx, roundedX, roundedY);
  }

  @Override
  public double getHeight() {
    return m_content.getBounds().getHeight();
  }

  public ZyLabelContent getLabelContent() {
    return m_content;
  }

  @Override
  public double getWidth() {
    return m_content.getBounds().getWidth();
  }
}