Re: Issue with dragging shapes

Hi fireball,
    Jonathan has the right of it.  You need a glass pane to make dragging
work at all.
You might be interested in looking at the samples/solitaire directory which
does card dragging along these lines.

On Sat, Aug 4, 2012 at 3:30 PM, jonathan wood <[email protected]>wrote:

> I've found it best to handle mousedown on the element being dragged, then
> track all mm/mu on a glasspane above the elements to be dragged.
>
> here's a very simple example in svg:
>
> <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
> <svg version="1.1" width="100%" height="100%" xmlns="
> http://www.w3.org/2000/svg" onload="init()" pointer-events="all">
>     <script type="text/ecmascript">
>         <![CDATA[
>         var drag = false;
>         var svg;
>         var draggable;
>
>         function init(e) {
>             svg = document.documentElement;
>             var rect = document.getElementById("draggable");
>             rect.addEventListener("mousedown", md, false);
>             svg.addEventListener("mousemove", mm, false);
>             svg.addEventListener("mouseup", mu, false);
>         }
>
>         function md(e) {
>             drag = true;
>             draggable = e.currentTarget;
>         }
>
>         function mu(e) {
>             drag = false;
>         }
>
>         function mm(e) {
>             if (drag) {
>                 var p = getPoint(e);
>                 var m = svg.createSVGMatrix().translate(p.x, p.y);
>                 var transform = "matrix(" + m.a + " " + m.b + " " + m.c +
> " " + m.d + " " + m.e + " " + m.f + ")";
>                 draggable.setAttributeNS(null, "transform", transform);
>             }
>         }
>
>         function getPoint(e) {
>             var p = svg.createSVGPoint();
>             p.x = e.clientX;
>             p.y = e.clientY;
>             p = p.matrixTransform(svg.getScreenCTM().inverse());
>             return p;
>         }
>         ]]>
>     </script>
>     <rect id="background" x="0" y="0" width="100%" height="100%"
> fill="#BBB" stroke="#000" />
>     <rect id="draggable" x="0" y="0" height="100" width="100"
> fill="cornflowerblue"/>
> </svg>
>
>
> On Sat, Aug 4, 2012 at 11:48 AM, fireball <[email protected]> wrote:
>
>> I have two issues actually, one major and one minor.
>>
>> Major: I can't drag shapes over others. I have to drag them around for it
>> to
>> work. Note that when I go back to the shape, the handle is still there and
>> the shape will continue moving without re-clicking.
>> Does it have to do with the way I add shapes to the DOM document or the
>> way
>> I handle the dragging, or is it both, or is it something else?
>>
>> Minor: Moving mouse too fast after a mousedown loses the shape (shape
>> stops
>> moving) but when I go back to it the handle is still there and the shape
>> keeps moving with the mouse without re-clicking on it. Same behaviour as
>> in
>> the major case above. What would be the cause?
>>
>> I register a handler object which listens to mousedown, mousemove, and
>> mouseup for any object that is draggable. I do keep track of initial
>> points
>> to re-adjust the position. Something similar to
>> http://wiki.apache.org/xmlgraphics-batik/DragTutorial
>>
>> Please let me know if you need to see any code for more info.
>>
>> Thanks,
>>
>> fireball.
>>
>>
>>
>> --
>> View this message in context:
>> http://batik.2283329.n4.nabble.com/Issue-with-dragging-shapes-tp4655175.html
>> Sent from the Batik - Users mailing list archive at Nabble.com.
>>
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>