Re: Canvas drawn objects mouse events

We are just a couple of weeks from having GA by the way and some of the things we are adding are just amazing. Take a look for instance at this transform.

http://www.emitrom-lienzo.appspot.com/#ExplorerPlaceImpl:transform_3_points

For the user of our API ... one line of code for that complicated transform.  Behind the scenes ... a lot of stuff going on.

- All shapes are grouped.

- All shapes are draggable.

The level of sophistication you'll find it's simply amazing and we are just finishing off 1.0 GA. The package is very light and has no dependencies.

On Thu, Nov 29, 2012 at 5:13 PM, Alfredo Quiroga-Villamil <lawwton@gmail.com> wrote:

I don't want to discourage you from trying your own implementation but you 

might want to take a look at Lienzo and see if it works for what you need. It's 100% built on GWT and lighting fast. It should do all the things you will need and likely more. It's released under Apache.

Explorer:

http://www.emitrom-lienzo.appspot.com/

Download:

http://www.emitrom.com/lienzo/download

Best regards,

Alfredo

On Thu, Nov 29, 2012 at 1:29 PM, Matt Fair <matt.fair@gmail.com> wrote:

I have the following code:

public void draw(Context2d context) {

context.beginPath();
context.rect(x, y, width, height);
context.fill();
context.closePath();
context.stroke();

}

I would like to add a mouse event for when the mouse moves over the rectangle.  What's the best way to do this?  I was able to do it if I in the mouse move event for the canvas and with an if statement I checked to see if the mouse moved within the coordinates of the rectangle.  

canvas.addMouseMoveHandler(new MouseMoveHandler() {

      public void onMouseMove(MouseMoveEvent event) {

        mouseX = event.getRelativeX(canvas.getElement());        
        mouseY = event.getRelativeY(canvas.getElement());

        if(insideRectangle(mouseX, mouseY)) {

            // fire mouse event for rectangle

        }

      }

    });

However, I am worry about working with a bunch of objects and speed doing it this way.  Is there a way to add a mouseMoveHandler directly to the rectangle?

Thanks,

Matt

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Alfredo Quiroga-Villamil

AOL/Yahoo/Gmail/MSN IM:  lawwton

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Alfredo Quiroga-Villamil

AOL/Yahoo/Gmail/MSN IM:  lawwton

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