Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.graphviz / src / org / simantics / graphviz / drawable / ViewerCanvas.java

diff --git a/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/ViewerCanvas.java b/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/ViewerCanvas.java
new file mode 100644 (file)
index 0000000..9ab86cc
--- /dev/null
+++ b/bundles/org.simantics.graphviz/src/org/simantics/graphviz/drawable/ViewerCanvas.java
@@ -0,0 +1,160 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.graphviz.drawable;\r
+\r
+import java.awt.Canvas;\r
+import java.awt.Color;\r
+import java.awt.Graphics;\r
+import java.awt.Graphics2D;\r
+import java.awt.Point;\r
+import java.awt.RenderingHints;\r
+import java.awt.event.ComponentAdapter;\r
+import java.awt.event.ComponentEvent;\r
+import java.awt.event.KeyAdapter;\r
+import java.awt.event.KeyEvent;\r
+import java.awt.event.MouseAdapter;\r
+import java.awt.event.MouseEvent;\r
+import java.awt.event.MouseWheelEvent;\r
+import java.awt.event.MouseWheelListener;\r
+import java.awt.geom.AffineTransform;\r
+import java.awt.geom.Rectangle2D;\r
+import java.awt.image.VolatileImage;\r
+\r
+/**\r
+ * A canvas showing a given Drawable.\r
+ * \r
+ * @author Hannu Niemist�\r
+ */\r
+public class ViewerCanvas extends Canvas {\r
+\r
+    private static final long serialVersionUID = -1094658958968314511L;\r
+    \r
+    AffineTransform transform;\r
+    Point prev;\r
+    VolatileImage im;\r
+    \r
+    Drawable drawable;\r
+\r
+    public ViewerCanvas(Drawable drawable) {\r
+        this.drawable = drawable;\r
+        setBackground(Color.WHITE);    \r
+        addKeyListener(new KeyAdapter() {\r
+\r
+            @Override\r
+            public void keyPressed(KeyEvent e) {\r
+                if(e.getKeyChar()=='1') {\r
+                    fit();\r
+                    repaint();\r
+                }\r
+            }\r
+\r
+        });\r
+        addMouseListener(new MouseAdapter() {\r
+\r
+            @Override\r
+            public void mousePressed(MouseEvent e) {\r
+                prev = e.getPoint();\r
+            }                          \r
+        });\r
+        addMouseMotionListener(new MouseAdapter() {\r
+            @Override\r
+            public void mouseDragged(MouseEvent e) {\r
+                Point cur = e.getPoint();\r
+                double deltaX = cur.getX()-prev.getX();\r
+                double deltaY = cur.getY()-prev.getY();                                        \r
+                transform.preConcatenate(AffineTransform.getTranslateInstance(deltaX, deltaY));                                                \r
+                repaint();\r
+                prev = cur;\r
+            }\r
+        });\r
+        addMouseWheelListener(new MouseWheelListener() {\r
+\r
+            @Override\r
+            public void mouseWheelMoved(MouseWheelEvent e) {\r
+                if(transform != null) {\r
+                    double scale = Math.exp(-0.1*e.getUnitsToScroll());\r
+                    Point p = e.getPoint();\r
+                    AffineTransform mod = new AffineTransform();\r
+                    mod.translate(p.getX(), p.getY());\r
+                    mod.scale(scale, scale);\r
+                    mod.translate(-p.getX(), -p.getY());\r
+                    transform.preConcatenate(mod);                                             \r
+                    repaint();\r
+                }\r
+            }\r
+\r
+        });\r
+        addComponentListener(new ComponentAdapter() {\r
+            @Override\r
+            public void componentResized(ComponentEvent e) {\r
+               if(getWidth() > 0 && getHeight() > 0) {\r
+                       im = createVolatileImage(getWidth(), getHeight());\r
+                       repaint();\r
+               }\r
+            }\r
+        });\r
+    }\r
+\r
+    public void fit() {\r
+        Rectangle2D bounds = drawable.getBounds();\r
+\r
+        Rectangle2D container = getBounds();\r
+        double scale = Math.min(\r
+            container.getWidth() / bounds.getWidth(), \r
+            container.getHeight() / bounds.getHeight());\r
+\r
+        transform = new AffineTransform(\r
+            scale, 0.0,\r
+            0.0, scale,\r
+            container.getX() + container.getWidth() * 0.5 - bounds.getCenterX() * scale,\r
+            container.getY() + container.getHeight() * 0.5 - bounds.getCenterY() * scale\r
+        );\r
+    }\r
+\r
+    @Override\r
+    public void paint(Graphics _g) {\r
+       do {\r
+               if (im == null || im.validate(getGraphicsConfiguration()) ==\r
+                       VolatileImage.IMAGE_INCOMPATIBLE) {\r
+                   im = createVolatileImage(getWidth(), getHeight());\r
+               }\r
+               \r
+               Graphics2D g = (Graphics2D)im.getGraphics();\r
+               \r
+               g.clearRect(0, 0, im.getWidth(null), im.getHeight(null));\r
+       \r
+               g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);\r
+               g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);\r
+               g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);\r
+       \r
+               if(transform == null)\r
+                   fit();\r
+               g.setTransform(transform);\r
+       \r
+               drawable.draw(g, null);\r
+            g.dispose();\r
+       } while(im.contentsLost());\r
+\r
+        _g.drawImage(im, 0, 0, this);\r
+    }\r
+\r
+    @Override\r
+    public void update(Graphics g) {\r
+        paint(g);\r
+    }\r
+    \r
+    public AffineTransform getTransform() {\r
+       return transform;\r
+    }\r
+\r
+}\r
+\r