de.fhg.igd.iva.explorer.main.OverlayExamplePanel.java Source code

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Here is the source code for de.fhg.igd.iva.explorer.main.OverlayExamplePanel.java

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/*
 * Copyright 2014 Fraunhofer IGD
 *
 * 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 de.fhg.igd.iva.explorer.main;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.awt.image.BufferedImage;
import java.math.RoundingMode;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import java.util.Random;

import javax.swing.JPanel;

import com.google.common.math.IntMath;

import de.fhg.igd.iva.colormaps.Colormap;

/**
 * Displays a text overlay on a blurred colormap
 * @author Martin Steiger
 */
public class OverlayExamplePanel extends JPanel {
    private static final long serialVersionUID = 4842610449905121603L;

    private Colormap colormap;

    private Color overlayColor;

    private int fontSize;

    /**
     * @param colormap the colormap to use
     */
    public OverlayExamplePanel(Colormap colormap) {
        this.colormap = colormap;
    }

    /**
     * @param colormap the new colormap
     */
    public void setColormap(Colormap colormap) {
        this.colormap = colormap;
        repaint();
    }

    /**
     * @param color the font color
     */
    public void setOverlayColor(Color color) {
        this.overlayColor = color;
    }

    @Override
    protected void paintComponent(Graphics g1) {
        super.paintComponent(g1);
        Graphics2D g = (Graphics2D) g1;

        Font derivedFont = g.getFont().deriveFont(Font.PLAIN, fontSize);

        Random r = new Random(123456);
        int gridX = 20;
        int gridY = 20;

        int width = IntMath.divide(getWidth(), gridX, RoundingMode.CEILING);
        int height = IntMath.divide(getHeight(), gridY, RoundingMode.CEILING);

        BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                double cx = r.nextDouble();
                double cy = r.nextDouble();

                Color color = colormap.getColor(cx, cy);

                img.setRGB(x, y, color.getRGB());
            }
        }

        // width * gridX is not identical with getWidt() due to rounding

        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g.drawImage(img, 0, 0, width * gridX, height * gridY, null);

        FontRenderContext frc = g.getFontRenderContext();

        String text = "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt "
                + "ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo "
                + "dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. ";

        AttributedString attributedString = new AttributedString(text);
        attributedString.addAttribute(TextAttribute.FONT, derivedFont);
        AttributedCharacterIterator iterator = attributedString.getIterator();
        LineBreakMeasurer measurer = new LineBreakMeasurer(iterator, frc);

        g.setColor(overlayColor);

        float tx = 2; // add some tiny distance offset to the top/left corner
        float ty = 2;
        while (measurer.getPosition() < iterator.getEndIndex()) {
            TextLayout layout = measurer.nextLayout(getWidth());

            ty += layout.getAscent();
            float dx = 0;

            layout.draw(g, tx + dx, ty);
            ty += layout.getDescent() + layout.getLeading();
        }
    }

    /**
     * @param fontSize the font size
     */
    public void setFontSize(int fontSize) {
        this.fontSize = fontSize;
    }
}