Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.g2d / src / org / simantics / g2d / participant / OrientationRestorer.java

diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/participant/OrientationRestorer.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/participant/OrientationRestorer.java
new file mode 100644 (file)
index 0000000..9a7240a
--- /dev/null
+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/participant/OrientationRestorer.java
@@ -0,0 +1,138 @@
+/*******************************************************************************\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.g2d.participant;\r
+\r
+import java.awt.geom.Point2D;\r
+import java.awt.geom.Rectangle2D;\r
+import java.util.Timer;\r
+import java.util.TimerTask;\r
+\r
+import org.simantics.g2d.canvas.Hints;\r
+import org.simantics.g2d.canvas.ICanvasContext;\r
+import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;\r
+import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;\r
+import org.simantics.g2d.canvas.impl.HintReflection.HintListener;\r
+import org.simantics.utils.datastructures.disposable.DisposeState;\r
+import org.simantics.utils.datastructures.hints.IHintObservable;\r
+import org.simantics.utils.datastructures.hints.IHintContext.Key;\r
+import org.simantics.utils.threads.IThreadWorkQueue;\r
+\r
+/**\r
+ * Restores orientation of the canvas back to normal (north is up)\r
+ * \r
+ * \r
+ * @author Toni Kalajainen\r
+ */\r
+public class OrientationRestorer extends AbstractCanvasParticipant {\r
+\r
+    @Dependency\r
+    TransformUtil           util;\r
+    @Dependency\r
+    CanvasGrab              grab;\r
+    @Dependency\r
+    CanvasBoundsParticipant bounds;\r
+\r
+    long                    lastTrigger;\r
+    Point2D                 centerPoint        = new Point2D.Double();\r
+\r
+    transient Timer         timer              = new Timer("Rotate restore");\r
+    transient boolean       checkRotatePending = false;\r
+\r
+    TimerTask               task               = new TimerTask() {\r
+        @Override\r
+        public void run() {\r
+            ICanvasContext ctx = getContext();\r
+            if (ctx.getDisposeState() != DisposeState.Alive)\r
+                return;\r
+            IThreadWorkQueue thread = ctx.getThreadAccess();\r
+            if (thread == null)\r
+                return;\r
+            thread.asyncExec(new Runnable() {\r
+                @Override\r
+                public void run() {\r
+                    if (checkRotatePending)\r
+                        return;\r
+                    checkRotatePending = true;\r
+                    timerEvent();\r
+                }\r
+            });\r
+        }\r
+    };\r
+\r
+    @Override\r
+    public void removedFromContext(ICanvasContext ctx) {\r
+        timer.cancel();\r
+        super.removedFromContext(ctx);\r
+    }\r
+\r
+    @Override\r
+    public void addedToContext(ICanvasContext ctx) {\r
+        super.addedToContext(ctx);\r
+        long delay = 1000 / 25;\r
+        lastTrigger = System.currentTimeMillis();\r
+        timer.scheduleAtFixedRate(task, delay, delay);\r
+    }\r
+\r
+    @HintListener(Class = Hints.class, Field = "KEY_CANVAS_BOUNDS")\r
+    public void selectionChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {\r
+        Rectangle2D cb = (Rectangle2D) newValue;\r
+        this.centerPoint.setLocation(cb.getCenterX(), cb.getCenterY());\r
+    }\r
+\r
+    void timerEvent() {\r
+        ICanvasContext ctx = getContext();\r
+        if (ctx == null)\r
+            return;\r
+        if (ctx.getDisposeState() != DisposeState.Alive)\r
+            return;\r
+        long cur = System.currentTimeMillis();\r
+        long delta = cur - lastTrigger;\r
+        lastTrigger = cur;\r
+        checkRotatePending = false;\r
+\r
+        Point2D centerPoint = new Point2D.Double();\r
+        int grabCount = grab.grabInfo.size();\r
+        if (grabCount == 0) {\r
+            centerPoint = this.centerPoint;\r
+        } else if (grabCount == 1) {\r
+            centerPoint = grab.grabInfo.values().iterator().next().anchorPos;\r
+        } else {\r
+            angVel = 0.0;\r
+            return;\r
+        }\r
+\r
+        // turn the canvas a bit\r
+        double theta = util.getRotate();\r
+        if (theta == 0.0)\r
+            return;\r
+//        if (Math.abs(theta) < 0.0001) {\r
+//            angVel = 0.0;\r
+//            return;\r
+//        }\r
+        if (Math.abs(theta) < 0.001) {\r
+            util.restoreOrientation(centerPoint);\r
+            angVel = 0.0;\r
+            return;\r
+        }\r
+\r
+        double momentum = theta * 100;\r
+        double dt = ((double) delta) / 1000;\r
+        if (dt > 0.150)\r
+            dt = 0.150;\r
+        angVel += momentum * dt;\r
+        util.rotate(centerPoint, -angVel * dt);\r
+        angVel *= 0.5;\r
+    }\r
+\r
+    double angVel = 0.0;\r
+\r
+}\r