Examples of java.awt.geom.Area

java.awt.geom.Area
An Area object stores and manipulates a resolution-independent description of an enclosed area of 2-dimensional space. Area objects can be transformed and can perform various Constructive Area Geometry (CAG) operations when combined with other Area objects. The CAG operations include area {@link #add addition}, {@link #subtract subtraction}, {@link #intersect intersection}, and {@link #exclusiveOr exclusive or}. See the linked method documentation for examples of the various operations.
The Area class implements the Shape interface and provides full support for all of its hit-testing and path iteration facilities, but an Area is more specific than a generalized path in a number of ways:
- Only closed paths and sub-paths are stored. Area objects constructed from unclosed paths are implicitly closed during construction as if those paths had been filled by the Graphics2D.fill method.
- The interiors of the individual stored sub-paths are all non-empty and non-overlapping. Paths are decomposed during construction into separate component non-overlapping parts, empty pieces of the path are discarded, and then these non-empty and non-overlapping properties are maintained through all subsequent CAG operations. Outlines of different component sub-paths may touch each other, as long as they do not cross so that their enclosed areas overlap.
- The geometry of the path describing the outline of the Area resembles the path from which it was constructed only in that it describes the same enclosed 2-dimensional area, but may use entirely different types and ordering of the path segments to do so.
Interesting issues which are not always obvious when using the Area include:
- Creating an Area from an unclosed (open) Shape results in a closed outline in the Area object.
- Creating an Area from a Shape which encloses no area (even when "closed") produces an empty Area. A common example of this issue is that producing an Area from a line will be empty since the line encloses no area. An empty Area will iterate no geometry in its PathIterator objects.
- A self-intersecting Shape may be split into two (or more) sub-paths each enclosing one of the non-intersecting portions of the original path.
- An Area may take more path segments to describe the same geometry even when the original outline is simple and obvious. The analysis that the Area class must perform on the path may not reflect the same concepts of "simple and obvious" as a human being perceives.
@since 1.2

        Point2D.Double center = new Point2D.Double((double) width / 2,
                (double) height / 2);
        double fixedAngle = 2.0 * Math.PI / barsCount;
        double maxY = 0.0d;
        for (double i = 0.0; i < barsCount; i++) {
            Area primitive = buildPrimitive();


            AffineTransform toCenter = AffineTransform.getTranslateInstance(
                    center.getX(), center.getY());
            AffineTransform toBorder = AffineTransform.getTranslateInstance(
                    35.0, -6.0);
            AffineTransform toCircle = AffineTransform.getRotateInstance(-i
                    * fixedAngle, center.getX(), center.getY());


            AffineTransform toWheel = new AffineTransform();
            toWheel.concatenate(toCenter);
            toWheel.concatenate(toBorder);


            primitive.transform(toWheel);
            primitive.transform(toCircle);


            areas[(int) i] = primitive;


            Rectangle2D bounds = primitive.getBounds2D();
            if (bounds.getMaxY() > maxY) {
                maxY = bounds.getMaxY();
            }
        }

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        Rectangle2D.Double body = new Rectangle2D.Double(6, 0, 30, 12);


        Ellipse2D.Double head = new Ellipse2D.Double(0, 0, 12, 12);
        Ellipse2D.Double tail = new Ellipse2D.Double(30, 0, 12, 12);


        Area tick = new Area(body);
        tick.add(new Area(head));
        tick.add(new Area(tail));


        return tick;
    }

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            out.start("path");
            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]);

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                out.end();
            }
        }
        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();

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                    if(shape instanceof SPath) out.println("\n//path");
                    if(shape instanceof SArea) out.println("\n//area");
                    if(shape instanceof SPoly) out.println("\n//polygon");
                    if(shape instanceof NGon) out.println("\n//n-gon");


                    Area area = shape.toArea();
                    Rectangle2D bounds = area.getBounds2D();
                    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)+");");

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                gp.lineTo(boxes[5].x, boxes[5].y);
                gp.lineTo(boxes[6].x, boxes[6].y);
                gp.lineTo(boxes[7].x, boxes[7].y);
                gp.closePath();
            }
            areas[nAreas++] = new Area(gp);
        }


        mergeAreas(shape, areas, nAreas);
    }

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                gp.lineTo(boxes[5].x, boxes[5].y);
                gp.lineTo(boxes[6].x, boxes[6].y);
                gp.lineTo(boxes[7].x, boxes[7].y);
                gp.closePath();
            }
            areas[nAreas++] = new Area(gp);
        }


        mergeAreas(shape, areas, nAreas);
    }

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    /**
     * Returns the area painted by this shape painter.
     */
    public Shape getPaintedArea(){
        if (painters != null) {
            Area paintedArea = new Area();
            for (int i=0; i < count; ++i) {
                Shape s = painters[i].getPaintedArea();
                if (s != null) {
                    paintedArea.add(new Area(s));
                }
            }
            return paintedArea;
        } else {
            return null;

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     */
    public boolean shouldBeClipped(Shape clip, Shape s) {
        if (clip == null || s == null) {
            return false;
        }
        Area as = new Area(s);
        Area imclip = new Area(clip);
        imclip.intersect(as);
        return !imclip.equals(as);
    }

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        if (s != null) {
            s = transform.createTransformedShape(s);
        }


        if (clip != null) {
            Area newClip = new Area(clip);
            newClip.intersect(new Area(s));
            clip = new GeneralPath(newClip);
        } else {
            clip = s;
        }
    }

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