After further investigation, it seems like I need to call
the "getTransformToElement"-method - which isn't available in v3.0
of the Adobe plugin. Requiering Adobe 6.0 beta isn't an option. So
what calculations does getTransformToElement do? Is there some way
that I can create my own getTransformToElement-method?
// Henric
--- In svg-developers@yahoogroups.com, "phre4kerz" <[EMAIL PROTECTED]> wrote:
> I have an application that loads an SVG, then enables the editing
of
> the properties of several of the SVG-elements.
>
> When I want to edit the x and Y-properties of for example a tspan-
> object I get a problem.
> In the XML, the tspan-object has an x-value of 20, and a y-value
of 20.
>
> When I call getBBox() I get x: -48.5 y: -26.015
>
> Then I call getCTM() and transform the BBox-values to the correct
> coordinates on the screen: x: 151.5 y: 40.89. These values are
the
> ones that I send out to the user for editing.
>
> Now to the problem: I don't know how to count backwards and make
151.5
> and 40.89 become 20 again. By inverting the CTM-matrix I can go
from
> x: 151.5 and y: 40.89 to x: -48.5 and y: -26.015 but I have no
idea
> how to go from those numbers to 20.
>
>
>
> //One of the text/tspan-objects I'm trying to modify:
>
> <text id="text100" transform="matrix(1 0 0 1 200 66.9043)"
> startOffset="0"><tspan x="20" y="20" fill="#C40009" font-
> family="'HelveticaNeue-Roman'" font-size="64" style="text-anchor:
> end">35</tspan></text>
>
> // Messy code to go from BBox-coordinates to Screen-coordinates:
>
> PositionControl.prototype.getRealPosition = function(obj,
dimension,
> decimals)
> {
>
> if (decimals == null) decimals = 0;
>
> // Get the bounding-box of the object
> bbox = obj.getBBox();
> // Get the transformation-matrix of the object
> var ctmmatrix = obj.getCTM();
>
> // An SVGPoint-variable
> var windowPoint = svgDocument.documentElement.createSVGPoint
();
> // Set the svgPoints variables to that of the bounding-box x
> and y-coord
> windowPoint.x = bbox.x;
> windowPoint.y = bbox.y;
> // Transform the point with the objects CTM-matrix
> var viewBoxPoint = windowPoint.matrixTransform(ctmmatrix);
>
> // round the numbers
> var z = Math.pow(10, decimals);
>
> // Return the transformed values
> if (dimension == "x")
> return Math.round(viewBoxPoint.x * z)/z;
> else if (dimension == "y")
> return Math.round(viewBoxPoint.y * z)/z;
> else
> return 0;
> }
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