brl/gnome-shell
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Improve the algorithm for proportional mouse tracking

Browse Source 
Change the proportional algorithm so stop moving the zoom region
when cursor is in a "padding region" at the edge of the screen.
(The padding region is a 10th of the screen at 2x zoom, and smaller
for higher zooms.)

Based on earlier versions from Jon McCann and Florian Muellner.

https://bugzilla.gnome.org/show_bug.cgi?id=629950
This commit is contained in:
Owen W. Taylor 2010-11-14 17:21:43 -05:00
parent c5c66ceb98
commit 96fb6d8f16
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
js/ui/magnifier.js
View File

@ -1093,10 +1093,15 @@ ZoomRegion.prototype = {
let [xRoi, yRoi, widthRoi, heightRoi] = this.getROI();
let halfScreenWidth = global.screen_width / 2;
let halfScreenHeight = global.screen_height / 2;
let xProportion = (halfScreenWidth - xMouse) / halfScreenWidth;
let yProportion = (halfScreenHeight - yMouse) / halfScreenHeight;
let xPos = xMouse + xProportion * widthRoi / 2;
let yPos = yMouse + yProportion * heightRoi / 2;
// We want to pad with a constant distance after zooming, so divide
// by the magnification factor.
let unscaledPadding = Math.min(this._viewPortWidth, this._viewPortHeight) / 5;
let xPadding = unscaledPadding / this._xMagFactor;
let yPadding = unscaledPadding / this._yMagFactor;
let xProportion = (xMouse - halfScreenWidth) / halfScreenWidth; // -1 ... 1
let yProportion = (yMouse - halfScreenHeight) / halfScreenHeight; // -1 ... 1
let xPos = xMouse - xProportion * (widthRoi / 2 - xPadding);
let yPos = yMouse - yProportion * (heightRoi /2 - yPadding);
return [xPos, yPos];
},