windows 8 - Crop image with dynamic rectangle coordinate -


i have image , want crop using rectangle, code below code put image , draw rectangle @ middle of image:

mainpage.xaml:

<canvas x:name="canvas" horizontalalignment="center" verticalalignment="center" width="340" height="480" background="blue">         <image x:name="photo" horizontalalignment="center" verticalalignment="center" manipulationmode="all">             <image.rendertransform>                 <compositetransform/>             </image.rendertransform>         </image>         <path stroke="black" strokethickness="1">             <path.data>                 <rectanglegeometry rect="0,0,340,480"/>             </path.data>         </path>     </canvas>

i able move image. code below transform image, , crop function working. how bind data , set rectangle coordinate dynamic instead of hard code coordinate? thanks.

public sealed partial class mainpage: page {         private compositetransform compositetranslation;          public mainpage()         {             this.initializecomponent();             photo.manipulationdelta += composite_manipulationdelta;             compositetranslation = new compositetransform();             photo.rendertransform = this.compositetranslation;         }          void composite_manipulationdelta(object sender, manipulationdeltaroutedeventargs e)         {             // scale image.             compositetranslation.centerx = photo.actualwidth / 2;             compositetranslation.centery = photo.actualheight / 2;             compositetranslation.scalex *= e.delta.scale;             compositetranslation.scaley *= e.delta.scale;             compositetranslation.translatex += e.delta.translation.x;             compositetranslation.translatey += e.delta.translation.y;         }          private void btncrop_click(object sender, routedeventargs e)         {             var _rect = new rectanglegeometry();             _rect.rect = path.data.bounds;             photo.clip = _rect;         } }

using below code, rectangle in middle of screen , image can panned. content within rectangle clipped.

<page.bottomappbar>     <appbar issticky="true" isopen="true">         <button content="crop" click="btncrop_click" />     </appbar> </page.bottomappbar>  <grid background="{staticresource applicationpagebackgroundthemebrush}">     <image x:name="photo" horizontalalignment="center" verticalalignment="center" manipulationmode="all" source="http://www.wired.com/reviews/wp-content/uploads/2012/10/windows-8-1.jpg" />     <path x:name="path" stroke="red" strokethickness="3" /> </grid> 
private compositetransform compositetranslation; rectanglegeometry rect = new rectanglegeometry(); public blankpage4() {     this.initializecomponent();     rect.rect = new rect((window.current.bounds.width - 480) / 2, (window.current.bounds.height - 340) / 2, 480, 340);     path.data = rect; }  protected override void onnavigatedto(navigationeventargs e) {     photo.manipulationdelta += composite_manipulationdelta;     compositetranslation = new compositetransform();     photo.rendertransform = this.compositetranslation; }  private void btncrop_click(object sender, routedeventargs e) {     generaltransform gt = photo.transformtovisual(null);     point pt = gt.transformpoint(new point(0, 0));     var _rect = new rectanglegeometry();     _rect.rect = new rect((rect.bounds.x / compositetranslation.scalex) - (pt.x / compositetranslation.scalex), (rect.bounds.y / compositetranslation.scaley) - (pt.y / compositetranslation.scaley), 480 / compositetranslation.scalex, 340 / compositetranslation.scaley);     photo.clip = _rect; }  void composite_manipulationdelta(object sender, manipulationdeltaroutedeventargs e) {     // scale image.     compositetranslation.centerx = photo.actualwidth / 2;     compositetranslation.centery = photo.actualheight / 2;     compositetranslation.scalex *= e.delta.scale;     compositetranslation.scaley *= e.delta.scale;     compositetranslation.translatex += e.delta.translation.x;     compositetranslation.translatey += e.delta.translation.y; }

updated: code updated told howard hee solving issue wherein zooming in/out show black screen


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