The ShapeGraphicAttribute.java Java example source code
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/*
* (C) Copyright Taligent, Inc. 1996 - 1997, All Rights Reserved
* (C) Copyright IBM Corp. 1996 - 1998, All Rights Reserved
*
* The original version of this source code and documentation is
* copyrighted and owned by Taligent, Inc., a wholly-owned subsidiary
* of IBM. These materials are provided under terms of a License
* Agreement between Taligent and Sun. This technology is protected
* by multiple US and International patents.
*
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* Taligent is a registered trademark of Taligent, Inc.
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*/
package java.awt.font;
import java.awt.Shape;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
/**
* The <code>ShapeGraphicAttribute class is an implementation of
* {@link GraphicAttribute} that draws shapes in a {@link TextLayout}.
* @see GraphicAttribute
*/
public final class ShapeGraphicAttribute extends GraphicAttribute {
private Shape fShape;
private boolean fStroke;
/**
* A key indicating the shape should be stroked with a 1-pixel wide stroke.
*/
public static final boolean STROKE = true;
/**
* A key indicating the shape should be filled.
*/
public static final boolean FILL = false;
// cache shape bounds, since GeneralPath doesn't
private Rectangle2D fShapeBounds;
/**
* Constructs a <code>ShapeGraphicAttribute for the specified
* {@link Shape}.
* @param shape the <code>Shape to render. The
* <code>Shape is rendered with its origin at the origin of
* this <code>ShapeGraphicAttribute in the
* host <code>TextLayout. This object maintains a reference to
* <code>shape.
* @param alignment one of the alignments from this
* <code>ShapeGraphicAttribute.
* @param stroke <code>true if the Shape should be
* stroked; <code>false if the Shape should be
* filled.
*/
public ShapeGraphicAttribute(Shape shape,
int alignment,
boolean stroke) {
super(alignment);
fShape = shape;
fStroke = stroke;
fShapeBounds = fShape.getBounds2D();
}
/**
* Returns the ascent of this <code>ShapeGraphicAttribute. The
* ascent of a <code>ShapeGraphicAttribute is the positive
* distance from the origin of its <code>Shape to the top of
* bounds of its <code>Shape.
* @return the ascent of this <code>ShapeGraphicAttribute.
*/
public float getAscent() {
return (float) Math.max(0, -fShapeBounds.getMinY());
}
/**
* Returns the descent of this <code>ShapeGraphicAttribute.
* The descent of a <code>ShapeGraphicAttribute is the distance
* from the origin of its <code>Shape to the bottom of the
* bounds of its <code>Shape.
* @return the descent of this <code>ShapeGraphicAttribute.
*/
public float getDescent() {
return (float) Math.max(0, fShapeBounds.getMaxY());
}
/**
* Returns the advance of this <code>ShapeGraphicAttribute.
* The advance of a <code>ShapeGraphicAttribute is the distance
* from the origin of its <code>Shape to the right side of the
* bounds of its <code>Shape.
* @return the advance of this <code>ShapeGraphicAttribute.
*/
public float getAdvance() {
return (float) Math.max(0, fShapeBounds.getMaxX());
}
/**
* {@inheritDoc}
*/
public void draw(Graphics2D graphics, float x, float y) {
// translating graphics to draw Shape !!!
graphics.translate((int)x, (int)y);
try {
if (fStroke == STROKE) {
// REMIND: set stroke to correct size
graphics.draw(fShape);
}
else {
graphics.fill(fShape);
}
}
finally {
graphics.translate(-(int)x, -(int)y);
}
}
/**
* Returns a {@link Rectangle2D} that encloses all of the
* bits drawn by this <code>ShapeGraphicAttribute relative to
* the rendering position. A graphic can be rendered beyond its
* origin, ascent, descent, or advance; but if it does, this method's
* implementation should indicate where the graphic is rendered.
* @return a <code>Rectangle2D that encloses all of the bits
* rendered by this <code>ShapeGraphicAttribute.
*/
public Rectangle2D getBounds() {
Rectangle2D.Float bounds = new Rectangle2D.Float();
bounds.setRect(fShapeBounds);
if (fStroke == STROKE) {
++bounds.width;
++bounds.height;
}
return bounds;
}
/**
* Return a {@link java.awt.Shape} that represents the region that
* this <code>ShapeGraphicAttribute renders. This is used when a
* {@link TextLayout} is requested to return the outline of the text.
* The (untransformed) shape must not extend outside the rectangular
* bounds returned by <code>getBounds.
* @param tx an optional {@link AffineTransform} to apply to the
* this <code>ShapeGraphicAttribute. This can be null.
* @return the <code>Shape representing this graphic attribute,
* suitable for stroking or filling.
* @since 1.6
*/
public Shape getOutline(AffineTransform tx) {
return tx == null ? fShape : tx.createTransformedShape(fShape);
}
/**
* Returns a hashcode for this <code>ShapeGraphicAttribute.
* @return a hash code value for this
* <code>ShapeGraphicAttribute.
*/
public int hashCode() {
return fShape.hashCode();
}
/**
* Compares this <code>ShapeGraphicAttribute to the specified
* <code>Object.
* @param rhs the <code>Object to compare for equality
* @return <code>true if this
* <code>ShapeGraphicAttribute equals rhs;
* <code>false otherwise.
*/
public boolean equals(Object rhs) {
try {
return equals((ShapeGraphicAttribute) rhs);
}
catch(ClassCastException e) {
return false;
}
}
/**
* Compares this <code>ShapeGraphicAttribute to the specified
* <code>ShapeGraphicAttribute.
* @param rhs the <code>ShapeGraphicAttribute to compare for
* equality
* @return <code>true if this
* <code>ShapeGraphicAttribute equals rhs;
* <code>false otherwise.
*/
public boolean equals(ShapeGraphicAttribute rhs) {
if (rhs == null) {
return false;
}
if (this == rhs) {
return true;
}
if (fStroke != rhs.fStroke) {
return false;
}
if (getAlignment() != rhs.getAlignment()) {
return false;
}
if (!fShape.equals(rhs.fShape)) {
return false;
}
return true;
}
}
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