107 lines
3.3 KiB
Java
107 lines
3.3 KiB
Java
/*
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ZZDrawing.java
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*
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* Copyright (c) 2000, Ted Nelson and Tuomas Lukka
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*
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* You may use and distribute under the terms of either the GNU Lesser
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* General Public License, either version 2 of the license or,
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* at your choice, any later version. Alternatively, you may use and
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* distribute under the terms of the XPL.
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*
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* See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of
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* the licenses.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the README
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* file for more details.
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*
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*/
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/*
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* Written by Tuomas Lukka
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*/
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package org.gzigzag;
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import java.awt.*;
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/** An abstraction of improved drawing primitives.
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* We are aiming for Java 1.1, but for instance Java2D provides
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* many features we'd like to use, if present.
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* Normally, simply testing <pre>g instanceof Graphics2D</pre>
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* would be sufficient but we want to also be able to <em>compile</em>
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* with only the 1.1 libraries available, so we cannot do that.
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* Also, we want to be able to hook up to e.g. OpenGL without
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* having to create a full Java2D implementation there.
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* <p>
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* This class is used to abstract out any graphics operations that
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* are not in java.awt.Graphics. The default of this class is that
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* each operation is a no-op (unless otherwise specified).
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* All code should function reasonably under such an assumption.
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* Subclasses of this object are allowed to implement operations
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* in any way they like.
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* <p>
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* TODO: Should make it possible to get drawing parameters
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* from either system
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* properties (possibly preferable) or the ZZ structure.
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*/
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public class ZZDrawing {
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public static final String rcsid = "$Id: ZZDrawing.java,v 1.6 2001/03/26 12:41:00 tjl Exp $";
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/** Get a human-readable string identifying the ZZDrawing
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* instance and the settings.
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*/
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public String getType() {
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return "Default 1.1 API -compliant version: no antialiasing or rotation";
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}
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/** The default instance of ZZDrawing for others to use.
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*/
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static public final ZZDrawing instance = createInstance();
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private boolean qEnabled = true;
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/** Create an instance.
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*/
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static public ZZDrawing createInstance() {
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ZZDrawing ret = null;
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Class g2d = null, zzdj2d = null;
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try {
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g2d = Class.forName("java.awt.Graphics2D");
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zzdj2d = Class.forName("org.gzigzag.ZZDrawingJ2D");
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ret = (ZZDrawing)zzdj2d.newInstance();
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} catch(Exception e) {
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ZZLogger.exc(e);
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if(g2d != null) {
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ZZLogger.log("Graphics2D found but support not compiled in.");
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}
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}
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if(ret == null) ret = new ZZDrawing();
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return ret;
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}
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/** Set rendering so that the graphics context will draw
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* over translucently, with the given alpha.
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*/
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public void setAlpha(Graphics g, float alpha) {
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}
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/** Set good rendering quality.
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* XXX Should take a parameter.
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*/
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public void setQuality(Graphics g) {
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}
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/** Return true if it makes any difference. */
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public boolean enableQuality(boolean t) {
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qEnabled = t;
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return false;
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}
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public boolean qualityEnabled() { return qEnabled; }
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/** Set the defaults. To be called on all
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* Graphics objects used.
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*/
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public void setDefaults(Graphics g0) {
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}
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}
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