Examples of java.awt.geom.PathIterator

java.awt.geom.PathIterator
The PathIterator interface provides the mechanism for objects that implement the {@link java.awt.Shape Shape}interface to return the geometry of their boundary by allowing a caller to retrieve the path of that boundary a segment at a time. This interface allows these objects to retrieve the path of their boundary a segment at a time by using 1st through 3rd order Bézier curves, which are lines and quadratic or cubic Bézier splines.
Multiple subpaths can be expressed by using a "MOVETO" segment to create a discontinuity in the geometry to move from the end of one subpath to the beginning of the next.
Each subpath can be closed manually by ending the last segment in the subpath on the same coordinate as the beginning "MOVETO" segment for that subpath or by using a "CLOSE" segment to append a line segment from the last point back to the first. Be aware that manually closing an outline as opposed to using a "CLOSE" segment to close the path might result in different line style decorations being used at the end points of the subpath. For example, the {@link java.awt.BasicStroke BasicStroke} object uses a line "JOIN" decoration to connect the first and last points if a "CLOSE" segment is encountered, whereas simply ending the path on the same coordinate as the beginning coordinate results in line "CAP" decorations being used at the ends. @see java.awt.Shape @see java.awt.BasicStroke @version 1.17, 11/17/05 @author Jim Graham


                Shape shape = graphic.getShape();
                if (shape == null)
                    continue;


                PathIterator path = shape.getPathIterator(new AffineTransform());
                int segment = 0;
                int itemsInPath = 0;
                boolean pathValid = true;


                for (; !path.isDone() && pathValid; path.next()) {
                    int type = path.currentSegment(points);
                    itemsInPath++;
                    boolean offScreen = false;
                    if (points[0] < 0 || points[0] >= width) {
                        // logger.warning("skipping x point " +
                        // points[0] + " b/c it's off the map.");

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  //
  //
  
  
  private void followPath(Shape s, int drawType) {
    PathIterator points;
    
      if (s==null) return;
      
      if (drawType==STROKE) {
          if (!(stroke instanceof BasicStroke)) {
              s = stroke.createStrokedShape(s);
              followPath(s, FILL);
              return;
          }
      }
//      if (drawType==STROKE) {
//          setStrokeDiff(stroke, oldStroke);
//          oldStroke = stroke;
//          setStrokePaint();
//      }
//      else if (drawType==FILL)
//          setFillPaint();
      points = s.getPathIterator(IDENTITY);
      int segments = 0;
      float[] coords = new float[6];
      while(!points.isDone()) {
          segments++;
          int segtype = points.currentSegment(coords);
          switch(segtype) {
              case PathIterator.SEG_CLOSE:
                pw.print("h ");
                  break;


              case PathIterator.SEG_CUBICTO:
                  curveto(coords[0], coords[1], coords[2], coords[3], coords[4], coords[5]);
                  break;


              case PathIterator.SEG_LINETO:
                  lineto(coords[0], coords[1]);
                  break;


              case PathIterator.SEG_MOVETO:
                  moveto(coords[0], coords[1]);
                  break;


              case PathIterator.SEG_QUADTO:
                  curveto(coords[0], coords[1], coords[2], coords[3]);
                  break;
          }
          points.next();
      }
      
      switch (drawType) {
      case FILL:
          if (segments > 0) {
              if (points.getWindingRule() == PathIterator.WIND_EVEN_ODD)
                closeBlock("B*");
              else
                closeBlock("B");
          }
          break;
      case STROKE:
          if (segments > 0)
              closeBlock("S");
          break;
      case CLIP:
      default: //drawType==CLIP
          if (segments == 0)
              drawRect(0, 0, 0, 0);
          if (points.getWindingRule() == PathIterator.WIND_EVEN_ODD)
            closeBlock("W*");
          else
            closeBlock("W");
      }
  }

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    // converts circles into polygons
    public static OMPoly convert(OMCircle omCircle, Projection proj) {
        GeneralPath shape = omCircle.getShape();


        // get the PathIterator that defines the outline of the circle
        PathIterator circle = shape.getPathIterator(null);
        Vector initialPoints = new Vector();
        float[] segPoints = new float[2];


        while (!circle.isDone()) {
            // by passing segpoints the array is filled with each x\y
            // point iterated by the circle
//            int segType = circle.currentSegment(segPoints);
            initialPoints.add(new Float(segPoints[0]));
            initialPoints.add(new Float(segPoints[1]));
            circle.next();
        }


        float[] circlePoints = new float[initialPoints.size()];


        if (proj == null) {

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        int refreshCounter = bufferSize;
        int[] stripCount = new int[1];
        stripCount[0] = 0;


        // null is AffineTransform...
        PathIterator pi2 = shape.getPathIterator(null);


        // flatness might need to be calculated, based
        // on scale or something. Depends on how many
        // points there should be for an accurate
        // shape rendition.

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        maxy=my;
        scalex=sx;
        scaley=sy;


        if (drawBars){
            PathIterator p=getPathIterator(null);
            double[] v=new double[2];
            double currentValue=Double.NEGATIVE_INFINITY;
            
            if (p instanceof CurveIterator){
                CurveIterator cu = (CurveIterator)p;


                while(!cu.isDone()){
                    cu.currentSegment(v);
                    if (cu.currentSegmentIsValid){
                        int xpos = (int)Math.round(v[0]);
                        g2.drawLine(xpos, 0, xpos, -height);


                        // display a label on the bar
                        double value = cu.currentYSourceValue;
                        if (value!=currentValue){
                            currentValue=value;
                            String ySourceValue =  new Double(currentValue).toString();
                            LabelShape label = new LabelShape(ySourceValue,xpos, -height,  LabelShape.RIGHTUP, true);
                            label.draw(g2);
                        }
                    }
                    cu.next();
                }
            }


        }else{
            g2.draw(this);  
            if(showPoints){
                Color oldColor = g2.getColor();
                float[] hsbs = new float[3];
                Color.RGBtoHSB(oldColor.getRed(), oldColor.getGreen(), oldColor.getBlue(), hsbs);
                float bb=(float)((hsbs[2]+0.5)%1.0);
                Color newColor = Color.getHSBColor(hsbs[0], hsbs[1], bb);
                g2.setColor(newColor);


                Stroke oldStroke = g2.getStroke();
                g2.setStroke(new BasicStroke());


                PathIterator p=getPathIterator(null);
                if (p instanceof CurveIterator){
                    CurveIterator cu = (CurveIterator)p;
                    double[] v=new double[2];
                    while(!cu.isDone()){
                        cu.currentSegment(v);

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    return new Rectangle2D.Double(x, y, height, width);
  }
  
  /** Returns the object's PathIterator. */
  public PathIterator getPathIterator(AffineTransform at) {
    return new PathIterator() {
      int state = 0;
      int maxstate = 4;
      float[][] fcurrentSegment = { {(float)(x + width/2), (float)y, 0f, 0f, 0f, 0f},
                      {(float)x, (float)(y + height/2), 0f, 0f, 0f, 0f},
                      {(float)(x + width/2), (float)(y + height), 0f, 0f, 0f, 0f},

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    public double getHeight() {
        return height;
    }
    
    public PathIterator getPathIterator(AffineTransform affineTransform) {
        return new PathIterator() {
      int state = 0;
      int maxstate = 3;
            
      double[][] dcurrentSegment = {{x + width/2, y},
                      {x, y + height},

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          getDiameter(), getDiameter());
      // Apply rotation to the rectangle
      AffineTransform rotation = new AffineTransform();
      rotation.setToRotation(getNorthDirection(), getX(), getY());
      this.pointsCache = new float[4][2];
      PathIterator it = pieceRectangle.getPathIterator(rotation);
      for (int i = 0; i < this.pointsCache.length; i++) {
        it.currentSegment(this.pointsCache [i]);
        it.next();
      }
    }
    return new float [][] {this.pointsCache [0].clone(), this.pointsCache [1].clone(), 
                           this.pointsCache [2].clone(), this.pointsCache [3].clone()};
  }

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   * Returns the points of each corner of a piece.
   * @return an array of the 4 (x,y) coordinates of the piece corners.
   */
  public float [][] getPoints() {
    float [][] piecePoints = new float[4][2];
    PathIterator it = getShape().getPathIterator(null);
    for (int i = 0; i < piecePoints.length; i++) {
      it.currentSegment(piecePoints [i]);
      it.next();
    }
    return piecePoints;
  }

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          getY() - getDepth() / 2,
          getWidth(), getDepth());
      // Apply rotation to the rectangle
      AffineTransform rotation = new AffineTransform();
      rotation.setToRotation(getAngle(), getX(), getY());
      PathIterator it = pieceRectangle.getPathIterator(rotation);
      GeneralPath pieceShape = new GeneralPath();
      pieceShape.append(it, false);
      // Cache shape
      this.shapeCache = pieceShape;
    }

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