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|
//////////////////////////////////////////////////////////////////////
// //
// JCSP ("CSP for Java") Libraries //
// Copyright (C) 1996-2008 Peter Welch and Paul Austin. //
// 2001-2004 Quickstone Technologies Limited. //
// //
// This library is free software; you can redistribute it and/or //
// modify it under the terms of the GNU Lesser General Public //
// License as published by the Free Software Foundation; either //
// version 2.1 of the License, or (at your option) any later //
// version. //
// //
// This library is distributed in the hope that it will be //
// useful, but WITHOUT ANY WARRANTY; without even the implied //
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
// PURPOSE. See the GNU Lesser General Public License for more //
// details. //
// //
// You should have received a copy of the GNU Lesser General //
// Public License along with this library; if not, write to the //
// Free Software Foundation, Inc., 59 Temple Place, Suite 330, //
// Boston, MA 02111-1307, USA. //
// //
// Author contact: P.H.Welch@kent.ac.uk //
// //
// //
//////////////////////////////////////////////////////////////////////
package org.jcsp.awt;
import java.awt.*;
/**
* This implements the {@link Display} and {@link Paintable} interfaces and provides
* a channel-like connection between user processes and an active graphics component.
* <H2>Description</H2>
* A <TT>DisplayList</TT> is a passive object providing graphics services on behalf
* of a <TT>CSProcess</TT>. It provides an <I>occam3</I>-like <TT>CALL</TT>
* channel between the application <TT>CSProcess</TT> and the active graphics component
* (such as {@link ActiveCanvas <TT>ActiveCanvas</TT>})
* on which it wishes to draw.
*
* <p><img src="doc-files\DisplayList1.gif"></p>
*
* The <I>user process</I> {@link #set set}s, {@link #extend extend}s or {@link #change change}s
* a list of {@link GraphicsCommand GraphicsCommand}s maintained by the <TT>DisplayList</TT>.
* Any such operation causes the Java <I>Event thread</I> to call back, via the active graphics
* component, on its {@link #paint paint} or {@link #update update} methods and execute
* those commands.
* <P>
* The <I>user process</I> sees the {@link Display <TT>Display</TT>} interface to the <TT>DisplayList</TT>
* (in the same way as a writer process sees the <TT>OutputChannel</TT> interface to
* a <TT>Channel</TT>). The <TT>ActiveCanvas</TT> process sees the {@link Paintable <TT>Paintable</TT>}
* interface to the <TT>DisplayList</TT> (in the same way as a reader process sees
* the <TT>InputChannel</TT> interface to a <TT>Channel</TT>).
* <P>
* Unlike a <TT>Channel</TT>, however, a <TT>DisplayList</TT> should never block
* any of its attached processes indefinitely, regardless of the behaviour of its
* partner at the other end.
* The <TT>DisplayList</TT> imposes mutually exclusive access to its state and
* there are no <TT>wait/notify</TT> operations -- so any delays should be transient.
* User process sets/extends/changes and <TT>ActiveCanvas</TT>
* paints/updates on the <TT>DisplayList</TT>, therefore, should always succeed.
* <P>
* <I>Note: the cautionary note in the above paragraph is because Java
* makes no guarantee that any invocation of a </I><TT>synchronized</TT><I> method
* ever takes place. This is something with which any Java application has to live</I>.
* <P>
* Any number of user processes may draw on the same component via a <TT>DisplayList</TT>
* -- i.e. it is a <I>any-one</I> channel.
* By reserving different sections of a <TT>DisplayList</TT> for control by different
* processes, complex multiple animations can be simply managed.
* <P>
* <I>Note: in this release, only the </I>{@link #extend <TT>extend</TT>}<I> and
* </I>{@link #change <TT>change</TT>}<I> methods are safe for direct use by multiple
* user processes on the same </I><TT>DisplayList</TT><I>. A process should only invoke
* </I>{@link #set <TT>set</TT>}<I> at times when it knows others cannot be operating
* on that </I><TT>DisplayList</TT><I>. This would normally be required by an application,
* since a </I><TT>DisplayList</TT><I> re</I><TT>set</TT><I> invalidates the result
* returned by a previous </I><TT>extend</TT><I> and the base index used in
* a </I><TT>change</TT><I> -- i.e. concurrent processes doing these things will need
* to be informed before they do them again! However, if the list really needs concurrent
* setting without such an arrangement, this can be done within
* a </I><TT>synchronized</TT><I> block on the </I><TT>DisplayList</TT>.
* <P>
* User applications will not normally be implementing new processes that are at the receiving
* end of a <TT>DisplayList</TT>. Users will only be responsible for connecting a <TT>DisplayList</TT>
* to a standard <TT>org.jcsp.awt</TT> drawing component. This can either be done statically (e.g.
* through {@link ActiveCanvas#setPaintable <TT>setPaintable</TT>}) or dynamically (by sending
* a {@link GraphicsProtocol.SetPaintable} object through
* a {@link GraphicsProtocol} channel).
*
* @see org.jcsp.awt.GraphicsCommand
* @see org.jcsp.awt.Display
* @see org.jcsp.awt.Paintable
* @see org.jcsp.awt.ActiveCanvas
*
* @author P.H. Welch
*/
public class DisplayList implements Paintable, Display
{
private Component component;
private Dimension size; // ***
private Image image; // ***
private Graphics imageGraphics; // ***
private final int INITIAL_MAX_COMMANDS = 10;
private GraphicsCommand[] command = new GraphicsCommand[INITIAL_MAX_COMMANDS];
private int maxCommands = INITIAL_MAX_COMMANDS;
private int nCommands = 0;
private int updateIndex = 0; // invariant: 0 <= updateIndex <= nCommands <= maxCommands
private boolean refresh = false;
private boolean updated = true;
private long minRefreshInterval = 10; // milliseconds
/**
* Sets the array of <TT>GraphicsCommand</TT>s to be executed. The commands will
* be executed in ascending order of index.
* The <TT>repaint</TT> method of the registered component is called to trigger
* the {@link #update <TT>update</TT>} callback on this object.
* All commands will be executed.
* <P>
*
* @param c the array of GraphicsCommands to be executed.
*/
public void set(final GraphicsCommand[] c)
{
if (c != null)
{
final int n = c.length;
if (n > 0)
{
if (n <= maxCommands)
{
synchronized (this)
{
System.arraycopy(c, 0, command, 0, n);
nCommands = n;
updateIndex = 0;
refresh = true;
}
}
else
{
maxCommands = 2*n;
final GraphicsCommand[] tmp = new GraphicsCommand[maxCommands];
System.arraycopy(c, 0, tmp, 0, n);
synchronized (this)
{
command = tmp;
nCommands = n;
updateIndex = 0;
refresh = true;
}
}
}
}
component.repaint(minRefreshInterval);
}
/**
* Sets the <TT>GraphicsCommand</TT> to be executed.
* The <TT>repaint</TT> method of the registered component is called to trigger
* the {@link #update <TT>update</TT>} callback on this object.
* <P>
*
* @param c the GraphicsCommand to be executed.
*/
public void set(final GraphicsCommand c)
{
if (c != null)
{
synchronized (this)
{
command[0] = c;
nCommands = 1;
updateIndex = 0;
refresh = true;
}
}
component.repaint(minRefreshInterval);
}
/**
* Extends the array of <TT>GraphicsCommand</TT>s to be executed.
* The <TT>repaint</TT> method of the registered component is called to trigger
* the {@link #update <TT>update</TT>} callback on this object.
* Only the new commands will be executed.
* <P>
*
* @param c the extra GraphicsCommands to be executed.
* @return the start index of the extension.
*/
public synchronized int extend(final GraphicsCommand[] c)
{
final int extensionStart = nCommands;
if (c != null)
{
final int n = c.length;
if (n > 0)
{
final int newNcommands = extensionStart + n;
if (newNcommands <= maxCommands)
{
System.arraycopy(c, 0, command, extensionStart, n);
if (updated)
{
updateIndex = extensionStart;
updated = false;
}
nCommands = newNcommands;
}
else
{
maxCommands = 2*newNcommands;
final GraphicsCommand[] tmp = new GraphicsCommand[maxCommands];
System.arraycopy(command, 0, tmp, 0, extensionStart);
System.arraycopy(c, 0, tmp, extensionStart, n);
command = tmp;
if (updated)
{
updateIndex = extensionStart;
updated = false;
}
nCommands = newNcommands;
}
}
}
component.repaint(minRefreshInterval);
return extensionStart;
}
/**
* Extends the array of <TT>GraphicsCommand</TT>s to be executed by one command.
* The <TT>repaint</TT> method of the registered component is called to trigger
* the {@link #update <TT>update</TT>} callback on this object.
* Only the new command will be executed.
* <P>
*
* @param c the extra GraphicsCommand to be executed.
* @return the start index of the extension.
*/
public synchronized int extend(final GraphicsCommand c)
{
final int extensionStart = nCommands;
if (c != null)
{
final int newNcommands = extensionStart + 1;
if (newNcommands <= maxCommands)
{
command[extensionStart] = c;
if (updated)
{
updateIndex = extensionStart;
updated = false;
}
nCommands = newNcommands;
}
else
{
maxCommands = 2*newNcommands;
final GraphicsCommand[] tmp = new GraphicsCommand[maxCommands];
System.arraycopy(command, 0, tmp, 0, extensionStart);
tmp[extensionStart] = c;
command = tmp;
if (updated)
{
updateIndex = extensionStart;
updated = false;
}
nCommands = newNcommands;
}
}
component.repaint(minRefreshInterval);
return extensionStart;
}
/**
* Changes the array of <TT>GraphicsCommand</TT>s to be executed by replacing elements
* <TT>i</TT> onwards with the new ones. There must be at least <TT>(i + c.length)</TT>
* elements in the original array -- else this method will not change anything and will
* return false.
* The <TT>repaint</TT> method of the registered component is called to trigger
* the {@link #update <TT>update</TT>} callback on this object.
* All commands will be executed.
* <P>
*
* @param c the new GraphicsCommands to be executed.
* @param i the start index for the replacement.
* @return true if and only if the changes are successfully made.
*/
public boolean change(final GraphicsCommand[] c, final int i)
{
if (c != null)
{
final int n = c.length;
if (n > 0)
{
if ((i + n) <= nCommands)
{
synchronized (this)
{
System.arraycopy(c, 0, command, i, n);
updateIndex = 0;
refresh = true;
}
}
else
{
return false;
}
}
}
component.repaint(minRefreshInterval);
return true;
}
/**
* Changes the array of <TT>GraphicsCommand</TT>s to be executed by replacing element
* <TT>i</TT> with the new one. There must be at least <TT>(i + 1)</TT>
* elements in the original array -- else this method will not change anything and will
* return false.
* The <TT>repaint</TT> method of the registered component is called to trigger
* the {@link #update <TT>update</TT>} callback on this object.
* All commands will be executed.
* <P>
*
* @param c the new GraphicsCommand to be executed.
* @param i the index for the replacement.
* @return true if and only if the change is successfully made.
*/
public boolean change(final GraphicsCommand c, final int i)
{
if (c != null)
{
if (i < nCommands)
{
synchronized (this)
{
command[i] = c;
updateIndex = 0;
refresh = true;
}
}
else
return false;
}
component.repaint(minRefreshInterval);
return true;
}
/**
* Returns a copy of the array of <TT>GraphicsCommand</TT>s currently held.
* <P>
*
* @return a copy of the array of <TT>GraphicsCommand</TT>s currently held.
*/
public GraphicsCommand[] get()
{
final GraphicsCommand[] c = new GraphicsCommand[nCommands];
synchronized (this)
{
System.arraycopy(command, 0, c, 0, nCommands);
}
return c;
}
/**
* Sets the <TT>repaint</TT> interval invoked by the {@link #set <TT>set</TT>},
* {@link #extend <TT>extend</TT>} and {@link #change <TT>change</TT>} commands.
* The default is 10 milliseconds (the normal default for the
* {@link java.awt.Component#repaint <TT>repaint</TT>} method from {@link java.awt.Component}).
* <P>
*
* @param minRefreshInterval the display commands will be executed at most once
* per <TT>minRefreshInterval</TT> milliseconds.
*/
public void setMinRefreshInterval(final long minRefreshInterval)
{
this.minRefreshInterval = minRefreshInterval;
}
private void execute(int start, Graphics g)
{
for (int i = start; i < nCommands; i++)
{
final GraphicsCommand c = command[i];
switch (c.tag)
{
case GraphicsCommand.NULL_TAG:
// do nothing
break;
case GraphicsCommand.TRANSLATE:
final GraphicsCommand.Translate t = (GraphicsCommand.Translate) c;
g.translate(t.x, t.y);
break;
case GraphicsCommand.SET_COLOR:
final GraphicsCommand.SetColor sc = (GraphicsCommand.SetColor) c;
g.setColor(sc.c);
break;
case GraphicsCommand.SET_PAINT_MODE_TAG:
g.setPaintMode();
break;
case GraphicsCommand.SET_XOR_MODE:
final GraphicsCommand.SetXORMode sx = (GraphicsCommand.SetXORMode) c;
g.setXORMode(sx.c);
break;
case GraphicsCommand.SET_FONT:
final GraphicsCommand.SetFont sf = (GraphicsCommand.SetFont) c;
g.setFont(sf.f);
break;
case GraphicsCommand.CLIP_RECT:
final GraphicsCommand.ClipRect clr = (GraphicsCommand.ClipRect) c;
g.clipRect(clr.x, clr.y, clr.width, clr.height);
break;
case GraphicsCommand.SET_CLIP:
final GraphicsCommand.SetClip scl = (GraphicsCommand.SetClip) c;
switch (scl.cliptag)
{
case 0:
g.setClip(scl.x, scl.y, scl.width, scl.height);
break;
case 1:
g.setClip(scl.s);
break;
}
break;
case GraphicsCommand.COPY_AREA:
final GraphicsCommand.CopyArea ca = (GraphicsCommand.CopyArea) c;
g.copyArea(ca.x, ca.y, ca.width, ca.height, ca.dx, ca.dy);
break;
case GraphicsCommand.DRAW_LINE:
final GraphicsCommand.DrawLine dl = (GraphicsCommand.DrawLine) c;
g.drawLine(dl.x1, dl.y1, dl.x2, dl.y2);
break;
case GraphicsCommand.FILL_RECT:
final GraphicsCommand.FillRect fr = (GraphicsCommand.FillRect) c;
g.fillRect(fr.x, fr.y, fr.width, fr.height);
break;
case GraphicsCommand.DRAW_RECT:
final GraphicsCommand.DrawRect dr = (GraphicsCommand.DrawRect) c;
g.drawRect(dr.x, dr.y, dr.width, dr.height);
break;
case GraphicsCommand.CLEAR_RECT:
final GraphicsCommand.ClearRect cr = (GraphicsCommand.ClearRect) c;
g.clearRect(cr.x, cr.y, cr.width, cr.height);
break;
case GraphicsCommand.DRAW_ROUND_RECT:
final GraphicsCommand.DrawRoundRect drr = (GraphicsCommand.DrawRoundRect) c;
g.drawRoundRect(drr.x, drr.y, drr.width, drr.height, drr.arcWidth, drr.arcHeight);
break;
case GraphicsCommand.FILL_ROUND_RECT:
final GraphicsCommand.FillRoundRect frr = (GraphicsCommand.FillRoundRect) c;
g.fillRoundRect(frr.x, frr.y, frr.width, frr.height, frr.arcWidth, frr.arcHeight);
break;
case GraphicsCommand.DRAW_3D_RECT:
final GraphicsCommand.Draw3DRect d3r = (GraphicsCommand.Draw3DRect) c;
g.draw3DRect(d3r.x, d3r.y, d3r.width, d3r.height, d3r.raised);
break;
case GraphicsCommand.FILL_3D_RECT:
final GraphicsCommand.Fill3DRect f3r = (GraphicsCommand.Fill3DRect) c;
g.fill3DRect(f3r.x, f3r.y, f3r.width, f3r.height, f3r.raised);
break;
case GraphicsCommand.DRAW_OVAL:
final GraphicsCommand.DrawOval dov = (GraphicsCommand.DrawOval) c;
g.drawOval(dov.x, dov.y, dov.width, dov.height);
break;
case GraphicsCommand.FILL_OVAL:
final GraphicsCommand.FillOval fov = (GraphicsCommand.FillOval) c;
g.fillOval(fov.x, fov.y, fov.width, fov.height);
break;
case GraphicsCommand.DRAW_ARC:
final GraphicsCommand.DrawArc da = (GraphicsCommand.DrawArc) c;
g.drawArc(da.x, da.y, da.width, da.height, da.startAngle, da.arcAngle);
break;
case GraphicsCommand.FILL_ARC:
final GraphicsCommand.FillArc fa = (GraphicsCommand.FillArc) c;
g.fillArc(fa.x, fa.y, fa.width, fa.height, fa.startAngle, fa.arcAngle);
break;
case GraphicsCommand.DRAW_POLYLINE:
final GraphicsCommand.DrawPolyline dpl = (GraphicsCommand.DrawPolyline) c;
g.drawPolyline(dpl.xPoints, dpl.yPoints, dpl.nPoints);
break;
case GraphicsCommand.DRAW_POLYGON:
final GraphicsCommand.DrawPolygon dpg = (GraphicsCommand.DrawPolygon) c;
switch (dpg.polytag)
{
case 0:
g.drawPolygon(dpg.xPoints, dpg.yPoints, dpg.nPoints);
break;
case 1:
g.drawPolygon(dpg.p);
break;
}
break;
case GraphicsCommand.FILL_POLYGON:
final GraphicsCommand.FillPolygon fpg = (GraphicsCommand.FillPolygon) c;
switch (fpg.polytag)
{
case 0:
g.fillPolygon(fpg.xPoints, fpg.yPoints, fpg.nPoints);
break;
case 1:
g.fillPolygon(fpg.p);
break;
}
break;
case GraphicsCommand.DRAW_STRING:
final GraphicsCommand.DrawString ds = (GraphicsCommand.DrawString) c;
g.drawString(ds.string, ds.x, ds.y);
break;
case GraphicsCommand.DRAW_CHARS:
final GraphicsCommand.DrawChars dc = (GraphicsCommand.DrawChars) c;
g.drawChars(dc.data, dc.offset, dc.length, dc.x, dc.y);
break;
case GraphicsCommand.DRAW_BYTES:
final GraphicsCommand.DrawBytes db = (GraphicsCommand.DrawBytes) c;
g.drawBytes(db.data, db.offset, db.length, db.x, db.y);
break;
case GraphicsCommand.DRAW_IMAGE:
final GraphicsCommand.DrawImage di = (GraphicsCommand.DrawImage) c;
switch (di.drawtag)
{
case 0:
g.drawImage(di.image, di.x, di.y, component);
break;
case 1:
g.drawImage(di.image, di.x, di.y, di.width, di.height, component);
break;
case 2:
g.drawImage(di.image, di.x, di.y, di.bgcolor, component);
break;
case 3:
g.drawImage(di.image, di.x, di.y, di.width, di.height, di.bgcolor, component);
break;
case 4:
g.drawImage(di.image, di.dx1, di.dy1, di.dx2, di.dy2,
di.sx1, di.sy1, di.sx2, di.sy2, component);
break;
case 5:
g.drawImage(di.image, di.dx1, di.dy1, di.dx2, di.dy2,
di.sx1, di.sy1, di.sx2, di.sy2, di.bgcolor, component);
break;
}
break;
case GraphicsCommand.GENERAL:
final GraphicsCommand.General general = (GraphicsCommand.General) c;
general.g.doGraphic(g, component);
break;
}
}
}
/**
* Register the <TT>Component</TT> that will delegate its <TT>paint</TT> and
* <TT>update</TT> methods here. Only the JCSP <TT>Active</TT> component should
* perform this registration (in response to being passed this <TT>Paintable</TT>).
* <P>
*
* @param c the Component that will do the delegating.
*/
public synchronized void register(final Component c)
{
component = c;
}
/**
* This is the call-back delegated here by the registered <TT>Component</TT>.
* It will normally be the JVM <I>event thread</I> that is making this call.
* <P>
*
* @param g the graphics context for the painting.
*/
public synchronized void paint(final Graphics g)
{
final Dimension newSize = component.getSize();
if (image == null)
{
size = newSize;
image = component.createImage(size.width, size.height);
imageGraphics = image.getGraphics();
}
else if ((newSize.width != size.width) || (newSize.height != size.height))
{
size = newSize;
image = component.createImage(size.width, size.height);
imageGraphics = image.getGraphics();
}
execute(0, imageGraphics);
g.drawImage(image, 0, 0, component);
refresh = false;
}
/**
* This is the call-back delegated here by the registered <TT>Component</TT>.
* It will normally be the JVM <I>event thread</I> that is making this call.
* <P>
*
* @param g the graphics context for the painting.
*/
public synchronized void update(final Graphics g)
{
if (refresh)
{
final Dimension newSize = component.getSize();
if (image == null)
{
size = newSize;
image = component.createImage(size.width, size.height);
imageGraphics = image.getGraphics();
}
else if ((newSize.width != size.width) || (newSize.height != size.height))
{
size = newSize;
image = component.createImage(size.width, size.height);
imageGraphics = image.getGraphics();
}
execute(0, imageGraphics);
g.drawImage(image, 0, 0, component);
refresh = false;
updated = true;
}
else
{
final Dimension newSize = component.getSize();
if (image == null)
{
size = newSize;
image = component.createImage(size.width, size.height);
imageGraphics = image.getGraphics();
}
else if ((newSize.width != size.width) || (newSize.height != size.height))
{
size = newSize;
image = component.createImage(size.width, size.height);
imageGraphics = image.getGraphics();
}
execute(updateIndex, imageGraphics);
g.drawImage(image, 0, 0, component);
updated = true;
}
}
}
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