Changeset 156 for trunk/src/org/expeditee/actions/Misc.java

Timestamp:

07/25/08 09:24:45 (16 years ago)

Author:

ra33

Message:

Added calculate action

File:

• trunk/src/org/expeditee/actions/Misc.java (modified) (6 diffs)

trunk/src/org/expeditee/actions/Misc.java

@@ -9 +9 @@
 import java.io.IOException;
 import java.lang.reflect.Method;
+import java.text.NumberFormat;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
+import java.util.Observable;
+import java.util.Observer;
 
 import javax.imageio.ImageIO;
 
+import org.expeditee.gui.AttributeUtils;
+import org.expeditee.gui.AttributeValuePair;
 import org.expeditee.gui.DisplayIO;
 import org.expeditee.gui.Frame;
@@ -28 +33 @@
 import org.expeditee.stats.StatsLogger;
 import org.expeditee.stats.TreeStats;
+import org.nfunk.jep.Node;
+import org.nfunk.jep.Variable;
 
 /**
@@ -88 +95 @@
                                                 action);
                         }
+                } else {
+                        MessageBay.errorMessage("Item must be a text item.");
                 }
         }
@@ -106 +115 @@
                         if (deletedFrameName != null) {
                                 DisplayIO.Back();
-                                //Remove any links on the previous frame to the one being deleted
+                                // Remove any links on the previous frame to the one being
+                                // deleted
                                 Frame current = DisplayIO.getCurrentFrame();
                                 for (Item i : current.getItems())
@@ -116 +126 @@
                                 MessageBay.displayMessage(deletedFrame + " renamed "
                                                 + deletedFrameName);
-                                //FrameGraphics.Repaint();
+                                // FrameGraphics.Repaint();
                                 return;
                         }
@@ -645 +655 @@
                 return item;
         }
+
+        public static void calculate(Frame frame, Item toCalculate) {
+                if (toCalculate instanceof Text) {
+                        Text text = (Text) toCalculate;
+                        org.nfunk.jep.JEP myParser = new org.nfunk.jep.JEP();
+                        myParser.addStandardFunctions();
+                        myParser.addStandardConstants();
+                        myParser.setImplicitMul(true);
+
+                        Observer observer = new Observer() {
+                                private String _attribute = "";
+                                public void update(Observable ob, Object o) {
+                                        _attribute = ((Variable)o).getName() + ": ";
+                                }
+                                
+                                @Override
+                                public String toString() {
+                                        return _attribute;
+                                }
+                        };
+
+                        // Check for variables
+                        for (Text t : frame.getTextItems()) {
+                                AttributeValuePair avp = AttributeUtils.getPair(t.getText());
+                                if (avp != null) {
+                                        myParser.addVariable(avp.getAttribute(), avp
+                                                        .getDoubleValue());
+                                }
+                        }
+                        
+                        myParser.getSymbolTable().addObserver(observer);
+                        myParser.setAllowAssignment(true);
+                        myParser.setAllowUndeclared(true);
+                        
+                        // Do the calculation
+                        Node node = myParser.parseExpression(text.getText());
+                        if (node == null) {
+                                for (String s : myParser.getErrorInfo().split("\n")) {
+                                        MessageBay.errorMessage(s);
+                                }
+                        } else {
+                                Double result = myParser.getValue();
+                                NumberFormat nf = NumberFormat.getInstance();
+                                nf.setMinimumFractionDigits(0);
+                                nf.setMaximumFractionDigits(15);
+                                text.setText(observer.toString() + nf.format(result));
+                                text.setPosition(FrameMouseActions.MouseX,
+                                                FrameMouseActions.MouseY);
+                                FrameMouseActions.resetOffset();
+                        }
+
+                }
+        }
 }