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Refinement of math from previous check-in (avoiding some DOM calls) 

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@866 eee81c28-f429-11dd-99c0-75d572ba1ddd
master
Jeff Schiller 2009-10-22 03:18:54 +00:00
parent 5ade7006c1
commit a39af2b6d7
1 changed files with 14 additions and 12 deletions
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26
editor/svgcanvas.js
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@ -1532,6 +1532,16 @@ function BatchCommand(text) {
call("selected", [grip[0]]);
}
// Some global variables that we may need to refactor
var root_sctm = null;
// A (hopefully) quicker function to transform a point by a matrix
// (this function avoids any DOM calls and just does the math)
// returns a tuple representing the transformed point
var transformPoint = function(x, y, m) {
return { x: m.a * x + m.c * y + m.e, y: m.b * x + m.d * y + m.f};
};
// in mouseDown :
// - when we are in a create mode, the element is added to the canvas
// but the action is not recorded until mousing up
@ -1539,10 +1549,8 @@ function BatchCommand(text) {
// and do nothing else
var mouseDown = function(evt)
{
var sctm = svgroot.getScreenCTM().inverse();
var pt = svgroot.createSVGPoint();
pt.x = evt.pageX; pt.y = evt.pageY;
pt = pt.matrixTransform(sctm);
root_sctm = svgroot.getScreenCTM().inverse();
var pt = transformPoint( evt.pageX, evt.pageY, root_sctm );
var mouse_x = pt.x;
var mouse_y = pt.y;
@ -1847,10 +1855,7 @@ function BatchCommand(text) {
{
if (!started) return;
var selected = selectedElements[0];
var sctm = svgroot.getScreenCTM().inverse();
var pt = svgroot.createSVGPoint();
pt.x = evt.pageX; pt.y = evt.pageY;
pt = pt.matrixTransform(sctm);
var pt = transformPoint( evt.pageX, evt.pageY, root_sctm );
var mouse_x = pt.x;
var mouse_y = pt.y;
var shape = svgdoc.getElementById(getId());
@ -2606,10 +2611,7 @@ function BatchCommand(text) {
justSelected = null;
if (!started) return;
var sctm = svgroot.getScreenCTM().inverse();
var pt = svgroot.createSVGPoint();
pt.x = evt.pageX; pt.y = evt.pageY;
pt = pt.matrixTransform(sctm);
var pt = transformPoint( evt.pageX, evt.pageY, root_sctm );
var mouse_x = pt.x;
var mouse_y = pt.y;
var x = mouse_x / current_zoom;