01: /*
02: * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
03: * for visualizing and manipulating spatial features with geometry and attributes.
04: *
05: * Copyright (C) 2003 Vivid Solutions
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * as published by the Free Software Foundation; either version 2
10: * of the License, or (at your option) any later version.
11: *
12: * This program is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with this program; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20: *
21: * For more information, contact:
22: *
23: * Vivid Solutions
24: * Suite #1A
25: * 2328 Government Street
26: * Victoria BC V8T 5G5
27: * Canada
28: *
29: * (250)385-6040
30: * www.vividsolutions.com
31: */
32: package com.vividsolutions.jump.workbench.ui.renderer;
33:
34: import java.awt.Graphics2D;
35: import java.awt.geom.NoninvertibleTransformException;
36: import com.vividsolutions.jump.workbench.ui.LayerViewPanel;
37: import com.vividsolutions.jump.workbench.ui.WorkbenchFrame;
38:
39: /**
40: * Advantage over ImageCachingRenderer: no cached image (typically 1 MB each).
41: * Disadvantage: must redraw image each time (slower). Classic tradeoff between
42: * space and time.
43: */
44: public abstract class SimpleRenderer implements Renderer {
45: protected volatile boolean cancelled = false;
46:
47: public SimpleRenderer(Object contentID, LayerViewPanel panel) {
48: this .contentID = contentID;
49: this .panel = panel;
50: }
51:
52: private Object contentID;
53:
54: protected LayerViewPanel panel;
55:
56: protected abstract void paint(Graphics2D g) throws Exception;
57:
58: public void clearImageCache() {
59: }
60:
61: public boolean isRendering() {
62: return false;
63: }
64:
65: public Object getContentID() {
66: return contentID;
67: }
68:
69: public void copyTo(Graphics2D graphics) {
70: try {
71: cancelled = false;
72: paint(graphics);
73: } catch (Throwable t) {
74: panel.getContext().warnUser(WorkbenchFrame.toMessage(t));
75: t.printStackTrace(System.err);
76: return;
77: }
78: }
79:
80: public Runnable createRunnable() {
81: return null;
82: }
83:
84: public void cancel() {
85: cancelled = true;
86: }
87: }
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