windows 8 - Crop image with rectangle -


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 successful display image , draw rectangle. sample image below: enter image description here

now want click button crop image within rectangle(not auto clip). rectangle auto added when image loaded. cannot use "point pressed" , "point released". , cannot use "rectangle.clip" because auto clip image. how solve it? thanks

updated: able move image,how bind data , set rectangle coordinate dynamic? code below transform image. 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;         } }

i have not used or xaml creates confusion me. created snippet according problem. try , let me know results. have used same image posted

xaml

<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://i.stack.imgur.com/uibsp.png" />     <path x:name="path" stroke="red" strokethickness="3">         <path.data>             <rectanglegeometry rect="545,212,440,420"/>         </path.data>     </path> </grid>

c#

private void btncrop_click(object sender, routedeventargs e) {     var _rect = new rectanglegeometry();     _rect.rect = path.data.bounds;     photo.clip = _rect; }

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