import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.font.*;

public class ClipBarMeter extends BarMeter {

    protected Shape clipShape;
    protected int clipShapeNumber = OVAL;

    public static final int OVAL = 0;
    public static final int ROUND_RECTANGLE = 1;
    public static final int TEXT = 2;
    public static final int COMP_SHAPE = 3;
    public static final int GENERAL_PATH = 4;

    public Dimension getMinimumSize(){
        return new Dimension(200, 200);
    }

    public void setClipShape(int shapeNo){
        this.clipShapeNumber = shapeNo;
        clipShape = createClipShape(shapeNo);
    }

    protected Shape createClipShape(int shapeNo){

        Shape shape;

        switch(shapeNo){
          case OVAL:
            shape = new Ellipse2D.Double(0.0, 0.0,
                                 (double)width, (double)height);
            break;
          case ROUND_RECTANGLE:
            shape = new RoundRectangle2D.Double(0.0, 0.0,
                                (double)width, (double)height,
                                (double)width/5.0, (double)height/5.0);
            break;
          case TEXT:
            TextLayout text = new TextLayout("あj",
                             new Font("Serif", Font.BOLD, height),
                             new FontRenderContext(null, false, false));
            AffineTransform trans = new AffineTransform();
            trans.translate(0, text.getAscent()-text.getDescent());
            shape = text.getOutline(trans);
            break;
          case COMP_SHAPE:
            Area area1 = new Area(new RoundRectangle2D.Double(
                               0.0, (double)height*2.0/3.0,
                               (double)width, (double)height/3.0,
                               (double)width/10.0, (double)height/10.0));
            Area area2 = new Area(new RoundRectangle2D.Double(
                               (double)width/6.0, 0.0,
                               (double)width*2.0/3.0, (double)height/3.0,
                               (double)width/20.0, (double)height/20.0));
            Area area3 = new Area(new Rectangle2D.Double(
                               (double)width/4.0, (double)height/3.0,
                               (double)width/2.0, (double)height/3.0));
            Area area4 = new Area(new Rectangle2D.Double(
                               (double)width/3.0, (double)height/3.0,
                               (double)width/3.0, (double)height/3.0));

            area1.add(area2);
            area1.add(area3);
            area1.subtract(area4);
            shape = area1;

            break;
          case GENERAL_PATH:
            GeneralPath path = new GeneralPath();
            path.moveTo(0.0f, (float)height);
            path.curveTo(0.0f, (float)height*0.2f,
                         (float)width*0.9f, (float)height*0.7f,
                         (float)width*0.9f, 0.0f);
            path.lineTo((float)width, 0.0f);
            path.curveTo((float)width, (float)height*0.8f,
                         (float)width*0.1f, (float)height*0.3f,
                         (float)width*0.1f, (float)height);
            path.closePath();
            shape = path;

            break;
          default:
            shape = new Rectangle2D.Double(0.0, 0.0, (double)width, (double)height);
            break;
        }

        return shape;
    }

    // バーの描画
    protected void drawBar(Graphics g, double value){

        Graphics2D g2D = (Graphics2D)g;

        // 指示値の相対値を算出
        double val = (value - minimum)/ (maximum - minimum);

        // グラフ上の高さに変換
        val *= height;

        int y = height - (int)val;
        int h = (int)val;

        g2D.clip(clipShape);

        g2D.setColor(this.getForeground());
        g2D.fillRect(0, y, width, h);

        g2D.setColor(this.getBackground());
        g2D.fillRect(0, 0, width, y);
    }

    public void createBufferImage(){
        // アプレットのサイズをえる
        Dimension size = this.getSize();
        width = size.width;
        height = size.height;

        if(width != 0 && height != 0){
            // イメージの生成
            image = this.createImage(width, height);
            graphics = image.getGraphics();
            clipShape = createClipShape(clipShapeNumber);
        }
    }

    public void paint(Graphics g){

        // ダブルバッファリング用のイメージがなければ、
        // 生成し、グラフィックコンテキストをえる。
        if(image == null || resizeFlag){
            createBufferImage();
            resizeFlag = false;
        }

        graphics.setClip(null);

        // 背景色で塗りつぶす
        graphics.setColor(getParent().getBackground());
        graphics.fillRect(0, 0, width, height);

        // バーの描画
        drawBar(graphics, value);

        // イメージバッファの描画
        g.drawImage(image, 0, 0, width, height, this);
    }
}