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

            double dx = xoff;//bounds.getX();
            double dy = yoff;//bounds.getY();
            //don't subtract off the translation just yet
            //dx = xoff;
            //dy = yoff;
            PathIterator it = area.getPathIterator(null);
            while(!it.isDone()) {
                double[] coords = new double[6];
                int n = it.currentSegment(coords);
                if(n == PathIterator.SEG_MOVETO) {
                    out.println(".moveTo("+(coords[0]-dx)+","+(coords[1]-dy)+")");
                }
                if(n == PathIterator.SEG_LINETO) {
                    out.println(".lineTo("+(coords[0]-dx)+","+(coords[1]-dy)+")");
                }
                if(n == PathIterator.SEG_CUBICTO) {
                    out.println(".curveTo("+
                            (coords[0]-dx)+","+(coords[1]-dy)+","+(coords[2]-dx)+","+(coords[3]-dy)+
                            ","+(coords[4]-dx)+","+(coords[5]-dy)+")"
                    );
                }
                if(n == PathIterator.SEG_CLOSE) {
                    out.println(".closeTo()");
                    break;
                }
                it.next();
            }
            out.println(".build()");
            out.outdent();
            out.outdent();
            out.println(")");

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            out.attr("transform","translate("+ shape.getTranslateX()+","+ shape.getTranslateY()+")");
            //the vector data
            StringBuffer data = new StringBuffer();
            int count = 0;
            Area area = shape.toArea();
            PathIterator it = area.getPathIterator(new AffineTransform());
            while(!it.isDone()) {
                double[] coords = new double[6];
                int n = it.currentSegment(coords);
                if(n == PathIterator.SEG_MOVETO) {
                    data.append(" M "+coords[0]+" "+coords[1]);
                }
                if(n == PathIterator.SEG_LINETO) {
                    data.append(" L " + coords[0]+" " +coords[1]);
                }
                if(n == PathIterator.SEG_CUBICTO) {
                    data.append(" C "
                            +coords[0]+" "+coords[1] + " "
                            +coords[2]+" "+coords[3] + " "
                            +coords[4]+" "+coords[5] + " "
                            );
                }
                if(n == PathIterator.SEG_CLOSE) {
                    data.append(" z");
                    break;
                }
                it.next();
            }
            out.attr("d", data.toString());
/*
        for(int i=0; i<points.size(); i++) {
            if(i == 0) {

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            }
        }
        if(shape instanceof SArea) {
            SArea area = (SArea) shape;
            Area jarea = area.toArea();
            PathIterator it = jarea.getPathIterator(null);
            while(!it.isDone()) {
                double[] coords = new double[6];
                int n = it.currentSegment(coords);
                if(n == PathIterator.SEG_MOVETO) {
                    out.start("move","x",""+coords[0],"y",""+coords[1]).end();
                }
                if(n == PathIterator.SEG_LINETO) {
                    out.start("lineto","x",""+coords[0],"y",""+coords[1]).end();
                }
                if(n == PathIterator.SEG_CUBICTO) {
                    out.start("curveto",
                            "cx1",""+coords[0],"cy1",""+coords[1],
                            "cx2",""+coords[2],"cy2",""+coords[3],
                            "x2",""+coords[4],"y2",""+coords[5]
                    ).end();
                }
                if(n == PathIterator.SEG_CLOSE) {
                    out.start("close").end();
                    break;
                }
                it.next();
            }
        }
        exportProperties(out,shape);


    }

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                    double dx = bounds.getX();
                    double dy = bounds.getY();
                    out.println("ctx.translate("+dx+","+dy+");");
                    out.println("ctx.beginPath()");


                    PathIterator it = area.getPathIterator(null);
                    while(!it.isDone()) {
                        double[] coords = new double[6];
                        int n = it.currentSegment(coords);
                        if(n == PathIterator.SEG_MOVETO) {
                            out.println("ctx.moveTo("+(coords[0]-dx)+","+(coords[1]-dy)+");");
                        }
                        if(n == PathIterator.SEG_LINETO) {
                            out.println("ctx.lineTo("+(coords[0]-dx)+","+(coords[1]-dy)+");");
                        }
                        if(n == PathIterator.SEG_CUBICTO) {
                            out.println("ctx.bezierCurveTo("+
                                    (coords[0]-dx)+","+(coords[1]-dy)+","+(coords[2]-dx)+","+(coords[3]-dy)+
                                    ","+(coords[4]-dx)+","+(coords[5]-dy)+");"
                            );
                        }
                        if(n == PathIterator.SEG_CLOSE) {
                            out.println("ctx.closePath();");
                            break;
                        }
                        it.next();
                    }


                    out.println("ctx.fill();");
                    if(shape.getStrokeWidth() > 0 && shape.getStrokePaint() != null) {
                        out.println("ctx.strokeStyle = \"rgb("+serialize(shape.getStrokePaint())+");\"");

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                    // isn't met we are SOL.
                    float [] pts = new float[6];
                    int count = 0;
                    int type = -1;


                    PathIterator pi = gbounds.getPathIterator(null);
                    Point2D.Float firstPt = null;
                    if (isVertical()) {
                        if (glyphOrientationAuto) {
                            if (isLatinChar(ch))
                                glyphOrientationAngle = 90;
                            else
                                glyphOrientationAngle = 0;
                        }
                    }


                    while (!pi.isDone()) {
                        type = pi.currentSegment(pts);
                        if ((type == PathIterator.SEG_MOVETO) ||
                            (type == PathIterator.SEG_LINETO)) {
                            // LINETO or MOVETO
                            if (count > 4) break; // too many lines...
                            if (count == 4) {
                                // make sure we are just closing it..
                                if ((firstPt == null)     ||
                                    (firstPt.x != pts[0]) ||
                                    (firstPt.y != pts[1]))
                                    break;
                            } else {
                                Point2D.Float pt;
                                pt = new Point2D.Float(pts[0], pts[1]);
                                if (count == 0) firstPt = pt;
                                // Use sides of  rectangle...
                                switch (count) {
                                case 0: botPts[ptIdx]   = pt; break;
                                case 1: topPts[ptIdx]   = pt; break;
                                case 2: topPts[ptIdx+1] = pt; break;
                                case 3: botPts[ptIdx+1] = pt; break;
                                }
                            }
                        } else if (type == PathIterator.SEG_CLOSE) {
                                // Close in the wrong spot?
                            if ((count < 4) || (count > 5)) break;
                        } else {
                            // QUADTO or CUBETO
                            break;
                        }


                        count++;
                        pi.next();
                    }
                    if (pi.isDone()) {
                        // Sucessfully Expressed as a quadralateral...
                        if ((botPts[ptIdx]!=null) &&
                            ((topPts[ptIdx].x != topPts[ptIdx+1].x) ||
                             (topPts[ptIdx].y != topPts[ptIdx+1].y)))
                            // box isn't empty so use it's points...

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  }


  private String shapeCoordinates(Shape shape)
  {
    final StringBuilder sb = new StringBuilder();
    final PathIterator pi = shape.getPathIterator(null, 1.0);
    final float[] coords = new float[6];
    final float[] lastMove = new float[2];
    while (!pi.isDone())
    {
      switch (pi.currentSegment(coords))
      {
        case PathIterator.SEG_MOVETO :
          if (sb.length() != 0)
          {
            sb.append(",");
          }
          sb.append(Math.round(coords[0]));
          sb.append(",");
          sb.append(Math.round(coords[1]));
          lastMove[0] = coords[0];
          lastMove[1] = coords[1];
          break;
        case PathIterator.SEG_LINETO :
          if (sb.length() != 0)
          {
            sb.append(",");
          }
          sb.append(Math.round(coords[0]));
          sb.append(",");
          sb.append(Math.round(coords[1]));
          break;
        case PathIterator.SEG_CLOSE :
          if (sb.length() != 0)
          {
            sb.append(",");
          }
          sb.append(Math.round(lastMove[0]));
          sb.append(",");
          sb.append(Math.round(lastMove[1]));
          break;
      }
      pi.next();
    }
    return sb.toString();
  }

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                    // isn't met we are SOL.
                    float [] pts = new float[6];
                    int count = 0;
                    int type = -1;


                    PathIterator pi = gbounds.getPathIterator(null);
                    Point2D.Float firstPt = null;


                    while (!pi.isDone()) {
                        type = pi.currentSegment(pts);
                        if ((type == PathIterator.SEG_MOVETO) ||
                            (type == PathIterator.SEG_LINETO)) {
                            // LINETO or MOVETO
                            if (count > 4) break; // too many lines...
                            if (count == 4) {
                                // make sure we are just closing it..
                                if ((firstPt == null)     ||
                                    (firstPt.x != pts[0]) ||
                                    (firstPt.y != pts[1]))
                                    break;
                            } else {
                                Point2D.Float pt;
                                pt = new Point2D.Float(pts[0], pts[1]);
                                if (count == 0) firstPt = pt;
                                // Use sides of  rectangle...
                                switch (count) {
                                case 0: botPts[ptIdx]   = pt; break;
                                case 1: topPts[ptIdx]   = pt; break;
                                case 2: topPts[ptIdx+1] = pt; break;
                                case 3: botPts[ptIdx+1] = pt; break;
                                }
                            }
                        } else if (type == PathIterator.SEG_CLOSE) {
                                // Close in the wrong spot?
                            if ((count < 4) || (count > 5)) break;
                        } else {
                            // QUADTO or CUBETO
                            break;
                        }


                        count++;
                        pi.next();
                    }
                    if (pi.isDone()) {
                        // Sucessfully Expressed as a quadralateral...
                        if ((botPts[ptIdx]!=null) &&
                            ((topPts[ptIdx].x != topPts[ptIdx+1].x) ||
                             (topPts[ptIdx].y != topPts[ptIdx+1].y)))
                            // box isn't empty so use it's points...

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            // Special optimization in case of Rectangle Shape
            Rectangle2D r = (Rectangle2D) s;
            gen.defineRect(r.getX(), r.getY(), r.getWidth(), r.getHeight());
            return PathIterator.WIND_NON_ZERO;
        } else {
            PathIterator iter = s.getPathIterator(IDENTITY_TRANSFORM);
            processPathIterator(iter);
            return iter.getWindingRule();
        }
    }

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                return;
            }
        }
        applyStroke(getStroke());


        PathIterator iter = s.getPathIterator(IDENTITY_TRANSFORM);
        processPathIterator(iter);
        doDrawing(false, true, false);
        if (newClip || newTransform) {
            currentStream.write("Q\n");
            graphicsState.pop();

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    protected void writeClip(Shape s) {
        if (s == null) {
            return;
        }
        preparePainting();
        PathIterator iter = s.getPathIterator(IDENTITY_TRANSFORM);
        processPathIterator(iter);
        // clip area
        currentStream.write("W\n");
        currentStream.write("n\n");
    }

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