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/*******************************************************************************
* Copyright (c) 2000, 2011 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.graphics;
/**
* Instances of this class provide measurement information
* about fonts including ascent, descent, height, leading
* space between rows, and average character width.
* <code>FontMetrics</code> are obtained from <code>GC</code>s
* using the <code>getFontMetrics()</code> method.
*
* @see GC#getFontMetrics
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*/
public final class FontMetrics {
int ascent, descent, leading, height;
double averageCharWidth;
FontMetrics() {
}
public static FontMetrics cocoa_new (int ascent, int descent, int averageCharWidth, int leading, int height) {
FontMetrics fontMetrics = new FontMetrics();
fontMetrics.ascent = ascent;
fontMetrics.descent = descent;
fontMetrics.averageCharWidth = averageCharWidth;
fontMetrics.leading = leading;
fontMetrics.height = height;
return fontMetrics;
}
/**
* Invokes platform specific functionality to allocate a new FontMetrics.
* <p>
* <b>IMPORTANT:</b> This method is <em>not</em> part of the public
* API for <code>FontMetrics</code>. It is marked public only so that it
* can be shared within the packages provided by SWT. It is not
* available on all platforms, and should never be called from
* application code.
* </p>
*
* @noreference This method is not intended to be referenced by clients.
*/
public static FontMetrics cocoa_new (int ascent, int descent, double averageCharWidth, int leading, int height) {
FontMetrics fontMetrics = new FontMetrics();
fontMetrics.ascent = ascent;
fontMetrics.descent = descent;
fontMetrics.averageCharWidth = averageCharWidth;
fontMetrics.leading = leading;
fontMetrics.height = height;
return fontMetrics;
}
/**
* Compares the argument to the receiver, and returns true
* if they represent the <em>same</em> object using a class
* specific comparison.
*
* @param object the object to compare with this object
* @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
*
* @see #hashCode
*/
@Override
public boolean equals (Object object) {
if (object == this) return true;
if (!(object instanceof FontMetrics)) return false;
FontMetrics metrics = (FontMetrics)object;
return ascent == metrics.ascent && descent == metrics.descent && leading == metrics.leading &&
height == metrics.height && (Double.compare (averageCharWidth, metrics.averageCharWidth) == 0);
}
/**
* Returns the ascent of the font described by the receiver. A
* font's <em>ascent</em> is the distance from the baseline to the
* top of actual characters, not including any of the leading area,
* measured in pixels.
*
* @return the ascent of the font
*/
public int getAscent() {
return ascent;
}
/**
* Returns the average character width, measured in pixels,
* of the font described by the receiver.
*
* @return the average character width of the font
* @since 3.107
*/
public double getAverageCharacterWidth () {
return averageCharWidth;
}
/**
* Returns the average character width, measured in pixels,
* of the font described by the receiver.
*
* @return the average character width of the font
* @deprecated Use getAverageCharacterWidth() instead
*/
@Deprecated
public int getAverageCharWidth() {
return (int) averageCharWidth;
}
/**
* Returns the descent of the font described by the receiver. A
* font's <em>descent</em> is the distance from the baseline to the
* bottom of actual characters, not including any of the leading area,
* measured in pixels.
*
* @return the descent of the font
*/
public int getDescent() {
return descent;
}
/**
* Returns the height of the font described by the receiver,
* measured in pixels. A font's <em>height</em> is the sum of
* its ascent, descent and leading area.
*
* @return the height of the font
*
* @see #getAscent
* @see #getDescent
* @see #getLeading
*/
public int getHeight() {
return height;
}
/**
* Returns the leading area of the font described by the
* receiver. A font's <em>leading area</em> is the space
* above its ascent which may include accents or other marks.
*
* @return the leading space of the font
*/
public int getLeading() {
return leading;
}
/**
* Returns an integer hash code for the receiver. Any two
* objects that return <code>true</code> when passed to
* <code>equals</code> must return the same value for this
* method.
*
* @return the receiver's hash
*
* @see #equals
*/
@Override
public int hashCode() {
return ascent ^ descent ^ Double.hashCode (averageCharWidth) ^ leading ^ height;
}
String getName () {
String string = getClass ().getName ();
int index = string.lastIndexOf ('.');
if (index == -1) return string;
return string.substring (index + 1, string.length ());
}
@Override
public String toString() {
return getName() +
"{"
+ " ascent=" + ascent
+ " descent=" + descent
+ " averageCharWidth=" + averageCharWidth
+ " leading=" + leading
+ " height=" + height
+ "}";
}
}
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