curves.java

一个小公司要求给写的很简单的任务管理系统。

/*
 * @(#)Curves.java	1.28 06/08/29
 * 
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 * 
 * -Redistribution in binary form must reproduce the above copyright notice, 
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL 
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST 
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, 
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY 
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, 
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

/*
 * @(#)Curves.java	1.28 06/08/29
 */

package java2d.demos.Arcs_Curves;

import java.awt.*;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.awt.geom.QuadCurve2D;
import java.awt.geom.CubicCurve2D;
import java.awt.geom.PathIterator;
import java.awt.geom.FlatteningPathIterator;
import java.awt.font.TextLayout;
import java.awt.font.FontRenderContext;
import java2d.Surface;

import static java.awt.Color.*;
import static java.awt.geom.PathIterator.*;


/**
 * CubicCurve2D & QuadCurve2D curves includes FlattenPathIterator example.
 */
public class Curves extends Surface {

    private static Color colors[] = { BLUE, GREEN, RED };

    public Curves() {
        setBackground(WHITE);
    }


    public void render(int w, int h, Graphics2D g2) {

        int y = 0;
        g2.setColor(BLACK);
        FontRenderContext frc = g2.getFontRenderContext();
        TextLayout tl = new TextLayout("QuadCurve2D", g2.getFont(), frc);
        float xx = (float) (w*.5-tl.getBounds().getWidth()/2);
        tl.draw(g2, xx, tl.getAscent());

        tl = new TextLayout("CubicCurve2D", g2.getFont(), frc);
        xx = (float) (w*.5-tl.getBounds().getWidth()/2);
        tl.draw(g2, xx, h*.5f);
        g2.setStroke(new BasicStroke(5.0f));

        float yy = 20;

        for     (int i = 0; i < 2; i++) {
            for (int j = 0; j < 3; j++) {
                Shape shape = null;

                if (i == 0) {
                     shape = new QuadCurve2D.Float(w*.1f,yy,w*.5f,50,w*.9f,yy);
                } else {
                     shape = new CubicCurve2D.Float(w*.1f,yy,w*.4f,yy-15,
                                            w*.6f,yy+15,w*.9f,yy);
                }
                g2.setColor(colors[j]);
                if (j != 2)
                    g2.draw(shape);

                if (j == 1 ) {
                    g2.setColor(LIGHT_GRAY);
                    PathIterator f = shape.getPathIterator(null);
                    while ( !f.isDone() ) {
                        float[] pts = new float[6];
                        switch ( f.currentSegment(pts) ) {
                            case SEG_MOVETO:
                            case SEG_LINETO:
                                g2.fill(new Rectangle2D.Float(pts[0], pts[1], 5, 5));
                                break;
                            case SEG_CUBICTO:
                            case SEG_QUADTO:
                                g2.fill(new Rectangle2D.Float(pts[0], pts[1], 5, 5));
                                if (pts[2] != 0) {
                                    g2.fill(new Rectangle2D.Float(pts[2], pts[3], 5, 5));
                                }
                                if (pts[4] != 0) {
                                    g2.fill(new Rectangle2D.Float(pts[4], pts[5], 5, 5));
                                }
                        }
                        f.next();
                    }
                } else if (j == 2) {
                    PathIterator p = shape.getPathIterator(null);
                    FlatteningPathIterator f = new FlatteningPathIterator(p,0.1);
                    while ( !f.isDone() ) {
                        float[] pts = new float[6];
                        switch ( f.currentSegment(pts) ) {
                            case SEG_MOVETO:
                            case SEG_LINETO:
                                g2.fill(new Ellipse2D.Float(pts[0], pts[1],3,3));
                        }
                        f.next();
                    }
                }
                yy += h/6;
            }
            yy = h/2+15;
        }
    }


    public static void main(String argv[]) {
        createDemoFrame(new Curves());
    }
}