Effects : Shape « 2D Graphics GUI « Java






  1. Java
  2. 2D Graphics GUI
  3. Shape

Effects

Effects
      

import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;

import javax.swing.JFrame;

import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageDecoder;

public class ShowOff extends Component {
  public static void main(String[] args) {
    try {
      String filename = "largeJava2sLogo.jpg";
      String message = "Java Source and Support";
      int split = 4;
      JFrame f = new JFrame();
      f.getContentPane().setLayout(new BorderLayout());
      ShowOff showOff = new ShowOff(filename, message, split);
      f.add(showOff, BorderLayout.CENTER);
      f.setSize(f.getPreferredSize());
      f.setResizable(false);
      f.setVisible(true);
    } catch (Exception e) {
      System.out.println(e);
      System.exit(0);
    }
  }

  private BufferedImage mImage;

  private Font mFont;

  private String mMessage;

  private int mSplit;

  private TextLayout mLayout;

  public ShowOff(String filename, String message, int split)
      throws IOException, ImageFormatException {

    InputStream in = getClass().getResourceAsStream(filename);
    JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(in);
    mImage = decoder.decodeAsBufferedImage();
    in.close();

    mFont = new Font("Serif", Font.PLAIN, 116);

    mMessage = message;
    mSplit = split;

    setSize((int) mImage.getWidth(), (int) mImage.getHeight());
  }

  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);

    drawBackground(g2);
    drawImageMosaic(g2);
    drawText(g2);
  }

  protected void drawBackground(Graphics2D g2) {
    int side = 45;
    int width = getSize().width;
    int height = getSize().height;
    Color[] colors = { Color.yellow, Color.cyan, Color.orange, Color.pink,
        Color.magenta, Color.lightGray };
    for (int y = 0; y < height; y += side) {
      for (int x = 0; x < width; x += side) {
        Ellipse2D ellipse = new Ellipse2D.Float(x, y, side, side);
        int index = (x + y) / side % colors.length;
        g2.setPaint(colors[index]);
        g2.fill(ellipse);
      }
    }
  }

  protected void drawImageMosaic(Graphics2D g2) {
    int side = 36;
    int width = mImage.getWidth();
    int height = mImage.getHeight();
    for (int y = 0; y < height; y += side) {
      for (int x = 0; x < width; x += side) {
        float xBias = (float) x / (float) width;
        float yBias = (float) y / (float) height;
        float alpha = 1.0f - Math.abs(xBias - yBias);
        g2.setComposite(AlphaComposite.getInstance(
            AlphaComposite.SRC_OVER, alpha));
        int w = Math.min(side, width - x);
        int h = Math.min(side, height - y);
        BufferedImage tile = mImage.getSubimage(x, y, w, h);
        g2.drawImage(tile, x, y, null);
      }
    }
    g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
  }

  protected void drawText(Graphics2D g2) {
    FontRenderContext frc = g2.getFontRenderContext();
    mLayout = new TextLayout(mMessage, mFont, frc);
    int width = getSize().width;
    int height = getSize().height;
    Rectangle2D bounds = mLayout.getBounds();
    double x = (width - bounds.getWidth()) / 2;
    double y = height - bounds.getHeight();
    drawString(g2, x, y, 0);
    drawString(g2, width - bounds.getHeight(), y, -Math.PI / 2);
  }

  protected void drawString(Graphics2D g2, double x, double y, double theta) {
    g2.translate(x, y);
    g2.rotate(theta);
    String first = mMessage.substring(0, mSplit);
    float width = drawBoxedString(g2, first, Color.white, Color.red, 0);
    String second = mMessage.substring(mSplit);
    drawBoxedString(g2, second, Color.blue, Color.white, width);
    g2.rotate(-theta);
    g2.translate(-x, -y);
  }

  protected float drawBoxedString(Graphics2D g2, String s, Color c1,
      Color c2, double x) {
    FontRenderContext frc = g2.getFontRenderContext();
    TextLayout subLayout = new TextLayout(s, mFont, frc);
    float advance = subLayout.getAdvance();

    GradientPaint gradient = new GradientPaint((float) x, 0, c1,
        (float) (x + advance), 0, c2);
    g2.setPaint(gradient);
    Rectangle2D bounds = mLayout.getBounds();
    Rectangle2D back = new Rectangle2D.Double(x, 0, advance, bounds
        .getHeight());
    g2.fill(back);

    g2.setPaint(Color.white);
    g2.setFont(mFont);
    g2.drawString(s, (float) x, (float) -bounds.getY());
    return advance;
  }
}








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32.Creates a new Stroke-Object for the given type and with.
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