can run the code - Githubissues

What steps will reproduce the problem?
1. When I run the follow code,the problem occur.

  // Container for widgets and connections
    AbsolutePanel panel = new AbsolutePanel();
    panel.setWidth("100%");
    panel.setHeight("100%");
    RootPanel.get().add(panel);

    // elements to connect
    Widget x = new Label("X");
    Widget y = new Label("Y");
    Widget z = new Label("Z");
    panel.add(x, 100, 100);
    panel.add(y, 200, 200);
    panel.add(z, 300, 300);

    // gwt-diagrams stuff
    Connector c1 = UIObjectConnector.wrap(x);
    Connector c2 = UIObjectConnector.wrap(y);
    Connector c3 = UIObjectConnector.wrap(z);

    Connection connection1 = new RectilinearTwoEndedConnection(c1, c2);
    Connection connection2 = new BezierTwoEndedConnection(c2, c3);
    Connection connection3 = new StraightTwoEndedConnection(c2, c3);

    connection1.appendTo(panel);
    connection2.appendTo(panel);
    connection3.appendTo(panel);

What is the expected output? What do you see instead?

com.google.gwt.core.client.JavaScriptException: (TypeError):
canvas.getContext is not a function
 fileName:
jar:file:/gwt1.5.3/diagrams/lib/gwt-diagrams-0.2-RC00.jar!/pl/balon/gwt/diagrams
/client/common/bezier/BezierCurveCanvas.java
 lineNumber: 84
 stack: ([object gwt_nativewrapper_class],[object
gwt_nativewrapper_class],[object gwt_nativewrapper_class],[object
gwt_nativewrapper_class],"rgb(0, 0,
0)")@jar:file:/gwt1.5.3/diagrams/lib/gwt-diagrams-0.2-RC00.jar!/pl/balon/gwt/dia
grams/client/common/bezier/BezierCurveCanvas.java:84
gwtOnLoad([object Window],"com.google.HelloGWT","1.5")@:0
gwtOnLoad((function () {alert("Failed to load module
com.google.HelloGWT\".\nPlease see the log in the development shell for
details.");}),"com.google.HelloGWT","http://localhost:8888/com.google.HelloGWT/"
)@http://localhost:8888/com.google.HelloGWT/hosted.html?com_google_HelloGWT:20
maybeStartModule()@http://localhost:8888/com.google.HelloGWT/com.google.HelloGWT
.nocache.js:100
()@http://localhost:8888/com.google.HelloGWT/com.google.HelloGWT.nocache.js:354
@http://localhost:8888/com.google.HelloGWT/hosted.html?com_google_HelloGWT:39

    at
pl.balon.gwt.diagrams.client.common.bezier.BezierCurveCanvas.drawImpl(Native 
Method)
    at
pl.balon.gwt.diagrams.client.common.bezier.BezierCurveCanvas.draw(BezierCurveCan
vas.java:72)
    at
pl.balon.gwt.diagrams.client.connection.BezierTwoEndedConnection.update(BezierTw
oEndedConnection.java:85)
    at
pl.balon.gwt.diagrams.client.connection.AbstractConnection.update(AbstractConnec
tion.java:99)
    at
pl.balon.gwt.diagrams.client.connection.AbstractConnection.onAttach(AbstractConn
ection.java:110)
    at com.google.gwt.user.client.ui.Widget.setParent(Widget.java:231)
    at com.google.gwt.user.client.ui.Panel.adopt(Panel.java:119)
    at com.google.gwt.user.client.ui.ComplexPanel.add(ComplexPanel.java:86)
    at com.google.gwt.user.client.ui.AbsolutePanel.add(AbsolutePanel.java:80)
    at
pl.balon.gwt.diagrams.client.connection.AbstractConnection.appendTo(AbstractConn
ection.java:133)
    at com.google.client.HelloGWT.onModuleLoad(HelloGWT.java:47)

What version of the product are you using? On what operating system?
gwt 1.5.0 ,linux ,eclpise 3.2,fire fox
Original issue reported on code.google.com by zhwulov...@gmail.com on 19 Dec 2008 at 10:25
google-code-export / gwt-diagrams

can run the code #34
