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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Ilya S. Okomin
* @version $Revision$
*/
package java.awt.font;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import org.apache.harmony.awt.internal.nls.Messages;
/**
* The GraphicAttribute abstract class provides an opportunity to insert
* graphical elements in printed text.
*
* @since Android 1.0
*/
public abstract class GraphicAttribute {
/**
* The Constant TOP_ALIGNMENT indicates using the top line to calculate
* placement of graphics.
*/
public static final int TOP_ALIGNMENT = -1;
/**
* The Constant BOTTOM_ALIGNMENT indicates using the bottom line to
* calculate placement of graphics.
*/
public static final int BOTTOM_ALIGNMENT = -2;
/**
* The Constant ROMAN_BASELINE indicates the placement of the roman baseline
* with respect to the graphics origin.
*/
public static final int ROMAN_BASELINE = 0;
/**
* The Constant CENTER_BASELINE indicates the placement of the center
* baseline with respect to the graphics origin.
*/
public static final int CENTER_BASELINE = 1;
/**
* The Constant HANGING_BASELINE indicates the placement of the hanging
* baseline with respect to the graphics origin.
*/
public static final int HANGING_BASELINE = 2;
// the alignment of this GraphicAttribute
/**
* The alignment.
*/
private int alignment;
/**
* Instantiates a new graphic attribute with the specified alignment.
*
* @param align
* the specified alignment.
*/
protected GraphicAttribute(int align) {
if ((align < BOTTOM_ALIGNMENT) || (align > HANGING_BASELINE)) {
// awt.198=Illegal alignment argument
throw new IllegalArgumentException(Messages.getString("awt.198")); //$NON-NLS-1$
}
this.alignment = align;
}
/**
* Draws the GraphicAttribute at the specified location.
*
* @param graphics
* the Graphics.
* @param x
* the X coordinate of GraphicAttribute location.
* @param y
* the Y coordinate of GraphicAttribute location.
*/
public abstract void draw(Graphics2D graphics, float x, float y);
/**
* Gets the GraphicAttribute's advance. It's the distance from the point at
* which the graphic is rendered and the point where the next character or
* graphic is rendered.
*
* @return the GraphicAttribute's advance.
*/
public abstract float getAdvance();
/**
* Gets the alignment of this GraphicAttribute.
*
* @return the alignment of this GraphicAttribute.
*/
public final int getAlignment() {
return this.alignment;
}
/**
* Gets the ascent of this GraphicAttribute.
*
* @return the ascent of this GraphicAttribute.
*/
public abstract float getAscent();
/**
* Gets the bounds of this GraphicAttribute.
*
* @return the bounds of this GraphicAttribute.
*/
public Rectangle2D getBounds() {
float ascent = getAscent();
float advance = getAdvance();
float descent = getDescent();
// Default implementation - see API documentation.
return new Rectangle2D.Float(0, -ascent, advance, ascent + descent);
}
/**
* Gets the descent of this GraphicAttribute.
*
* @return the descent of this GraphicAttribute.
*/
public abstract float getDescent();
/**
* Gets the GlyphJustificationInfo of this GraphicAttribute.
*
* @return the GlyphJustificationInfo of this GraphicAttribute.
*/
public GlyphJustificationInfo getJustificationInfo() {
/*
* Default implementation. Since documentation doesn't describe default
* values, they were calculated based on 1.5 release behavior and can be
* obtained using next test sample: // Create GraphicAttribute class
* implementation public class MyGraphicAttribute extends
* GraphicAttribute { protected MyGraphicAttribute(int align) {
* super(align); } public float getDescent() { return 0; } public float
* getAdvance() { return 1; } public void draw(Graphics2D g2, float x,
* float y) { } public float getAscent() { return 0; } }
* MyGraphicAttribute myGA = gat.new MyGraphicAttribute(0); // print
* justification parameters
* System.out.println(myGA.getJustificationInfo().growAbsorb);
* System.out.println(myGA.getJustificationInfo().shrinkAbsorb);
* System.out.println(myGA.getJustificationInfo().growLeftLimit);
* System.out.println(myGA.getJustificationInfo().growPriority);
* System.out.println(myGA.getJustificationInfo().growRightLimit);
* System.out.println(myGA.getJustificationInfo().shrinkLeftLimit);
* System.out.println(myGA.getJustificationInfo().shrinkPriority);
* System.out.println(myGA.getJustificationInfo().shrinkRightLimit);
* System.out.println(myGA.getJustificationInfo().weight);
*/
float advance = getAdvance();
return new GlyphJustificationInfo(advance, false,
GlyphJustificationInfo.PRIORITY_INTERCHAR, advance / 3, advance / 3, false,
GlyphJustificationInfo.PRIORITY_WHITESPACE, 0, 0);
}
}
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