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

    public boolean checkClip(Shape cl) {
        if (getData().clip == null) {
            if (cl != null) {
                return true;
            }
        } else if (!new Area(getData().clip).equals(new Area(cl))) {
            return true;
        }
        //TODO check for clips that are larger than the current
        return false;
    }

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     *
     * @param cl the new clip in the current state
     */
    public void setClip(Shape cl) {
        if (getData().clip != null) {
            Area newClip = new Area(getData().clip);
            newClip.intersect(new Area(cl));
            getData().clip = new GeneralPath(newClip);
        } else {
            getData().clip = cl;
        }
    }

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     * @param shape
     * @return the master shape
     */
    private final Master createMaster(RenderContext ctx, Shape shape,
                                      double ascent) {
        final Area area = new Area(shape);
        final double scale = MASTER_HEIGHT / ascent;


        area.transform(AffineTransform.getScaleInstance(scale, scale));
        final Rectangle bounds = area.getBounds();
        // System.out.println("createMaster bounds " + bounds);
        // area.transform(AffineTransform.getTranslateInstance(-bounds.getMinX(),
        // -bounds.getMinY()));
        // bounds = area.getBounds();


        final int minX = (int) (bounds.getMinX() - 0.5);
        final int maxX = (int) (bounds.getMaxX() + 0.5);
        final int minY = (int) (bounds.getMinY() - 0.5);
        final int maxY = (int) (bounds.getMaxY() + 0.5);
        final int width = maxX - minX;
        final int height = maxY - minY;


        BitSet bits = (BitSet) ctx.getObject(BITS_NAME);
        if (bits == null) {
            bits = new BitSet(width * height);
            ctx.setObject(BITS_NAME, bits);
        } else {
            bits.clear();
        }
        int ofs = 0;
        for (int y = maxY; y > minY; y--) {
            for (int x = minX; x < maxX; x++) {
                if (area.contains(x, y)) {
                    bits.set(ofs);
                }
                ofs++;
            }
        }

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    }


    public final GlyphRenderer getRenderer(Glyph g, double ascent) {
        GlyphRenderer r = (GlyphRenderer) ctx.getObject(g);
        if (r == null) {
            Area area;
            if (g instanceof ShapedGlyph)
                area = new Area(((ShapedGlyph) g).getShape());
            else
                area = new Area(g.getBBox());


            r = new GlyphRenderer(ctx, area, ascent);
            ctx.setObject(g, r);
        }
        return r;

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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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    if (onStroke)
    {
      s = getStroke().createStrokedShape(s);
    }
    s = getTransform().createTransformedShape(s);
    final Area area = new Area(s);
    final Shape clip = getClip();
    if (clip != null)
    {
      area.intersect(new Area(clip));
    }
    return area.intersects(rect.x, rect.y, rect.width, rect.height);
  }

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    }


    final Rectangle2D boundsCorrected = bounds.getBounds2D();
    boundsCorrected.setRect(-DELTA, -DELTA,
        DELTA + boundsCorrected.getWidth(), DELTA + boundsCorrected.getHeight());
    final Area a = new Area(boundsCorrected);
    if (a.isEmpty())
    {
      // don't clip  ... Area does not like lines
      // operations with lines always result in an empty Bounds:(0,0,0,0) area
      return new GeneralPath();
    }


    final Area clipArea = new Area(s);
    a.intersect(clipArea);
    return a;


  }

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    setFont(new Font("sanserif", Font.PLAIN, 12));
    this.cb = cb;
    cb.saveState();
    this.width = width;
    this.height = height;
    clip = new Area(new Rectangle2D.Float(0, 0, width, height));
    clip(clip);
    oldStroke = strokeOne;
    stroke = strokeOne;
    originalStroke = strokeOne;
    setStrokeDiff(stroke, null);

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    if (onStroke)
    {
      s = stroke.createStrokedShape(s);
    }
    s = transform.createTransformedShape(s);
    final Area area = new Area(s);
    if (clip != null)
    {
      area.intersect(clip);
    }
    return area.intersects(rect.x, rect.y, rect.width, rect.height);
  }

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    g2.setFont(this.font);
    g2.cb = this.cb.getDuplicate();
    g2.cb.saveState();
    g2.width = this.width;
    g2.height = this.height;
    g2.followPath(new Area(new Rectangle2D.Float(0, 0, width, height)), PdfGraphics2D.CLIP);
    if (this.clip != null)
    {
      g2.clip = new Area(this.clip);
    }
    g2.stroke = stroke;
    g2.originalStroke = originalStroke;
    g2.strokeOne = (BasicStroke) g2.transformStroke(g2.strokeOne);
    g2.oldStroke = g2.strokeOne;

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