Hi.
My drawing operation was too slow with respect to Java.
I observed the code. So I get Canvas is faster than Graphics2D with AA
on.
But what was that slowness?
Many times, I'm creating a point object with several methods. The
creation of those objects were much slower than java.
I deleted the unnecessary methods. Then I reduced the problem as
follows:
CODE BEGIN
<code>
public class MGPoint
{
public double[] coor;
public MGPoint(double x, double y ) {
coor = new double[2];
coor[0] = x;
coor[1] = y;
}
public double getX()
{
return coor[0];
}
public double getY()
{
return coor[1];
}
public int getDimension()
{
return coor.length;
}
public void setCoordinates(double x, double y)
{
coor[0] = x;
coor[1] = y;
}
}
public class MGPoint2
{
public double x;
public double y;
public MGPoint2(double x, double y ) {
this.x = x;
this.y = y;
}
public double getX()
{
x;
}
public double getY()
{
y;
}
public int getDimension()
{
return 2;
}
public void setCoordinates(double x, double y)
{
this.x = x;
this.y = y;
}
}
public class Performance implements EntryPoint
{
public void onModuleLoad()
{
final TextBox box = new TextBox();
box.setText("100000");
final Button button = new Button("");
button.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event)
{
int times = Integer.parseInt(box.getText());
Duration d = new Duration();
double z = 0;
for(int i = 0; i < times; i++)
{
MGPoint point = new MGPoint(26,45);
double x = point.getX();
double y = point.getY();
int dimension = point.getDimension();
z = x + y + dimension;
}
int time = d.elapsedMillis();
button.setText(time + "::::" + z) ;
}
});
final Button button2 = new Button("");
button.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event)
{
int times = Integer.parseInt(box.getText());
Duration d = new Duration();
double z = 0;
for(int i = 0; i < times; i++)
{
MGPoint2 point = new MGPoint2(26,45);
double x = point.getX();
double y = point.getY();
int dimension = point.getDimension();
z = x + y + dimension;
}
int time = d.elapsedMillis();
button2.setText(time + "::::" + z) ;
}
});
RootPanel.get().add(box);
RootPanel.get().add(button1);
RootPanel.get().add(button2);
}
}
</code>
CODE END
The x,y approach takes 2 ms in chrome, 10 ms in firefox.
The double array approach takes 200 ms in chrome, 400 ms in firefox.
Java (Development mode) does below 4 ms in both case.
Is it GWT specific?
What are your suggestions? How can I decrease the time?
--
You received this message because you are subscribed to the Google Groups
"Google Web Toolkit" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en.
