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--- sample_code:image_array [2015/09/28 15:06]
stevegarman created
+++ sample_code:image_array [2015/09/29 17:27]
@@ Line 1: / Line 1: @@
-====== Image array ======
-Click part of the image to store a number in a 2d array representing the rectangles of the image.
-Click a rectangle multiple times and it will toggle between 1 and 2.
-A colour-coded rectangle appears on the image to show what value was in the array before it was updated.
-This is intended as a demo of one way to treat an image as a grid.
-<code JavaScript imageArray.js>
-var cellData=[];
-//Called when application is started.
-function OnStart()
-{
-    //Create a layout with objects vertically centered.
-    var lay = app.CreateLayout( "linear", "VCenter,FillXY" );
-    //Create a text label and add it to layout.
-    var img = app.CreateImage( null, 0.9, 0.5 );
-    img.SetColor("#ff999999")
-    img.SetOnTouch(imgOnTouch);
-    lay.AddChild( img );
-    var btnSave=app.CreateButton("Save");
-    btnSave.SetOnTouch(btnSaveOnTouch);
-    lay.AddChild(btnSave);
-    //Add layout to app.
-    app.AddLayout( lay );
-}
-function imgOnTouch(ev)
-{
-     var row,col,val,x1,y1,x2,y2
-     var cellWidth=0.1,cellHeight=0.1;
-     if(ev.action==="Down")
-     {
-         row = Math.floor(ev.Y/cellHeight);
-         col = Math.floor(ev.X/cellWidth);
-         x1 = col*cellWidth;
-         y1 = row*cellHeight;
-         x2 = x1 + cellWidth;
-         y2 = y1 + cellHeight;
-         val = getData(row,col);
-         this.SetLineWidth(1);
-         this.SetPaintStyle("Fill")
-         setData(row,col,(val+1)%2);
-         if(val < 0)
-         {
-            this.SetPaintColor("#ffff0000");
-            this.SetPaintStyle("Line")
-            this.DrawRectangle(x1,y1,x2,y2);
-         }
-         else if(val === 0)
-         {
-            this.SetPaintColor("#ff00ff00");
-            this.DrawRectangle(x1,y1,x2,y2);
-         }
-         else if(val === 1)
-         {
-            this.SetPaintColor("#ff0000ff");
-            this.DrawRectangle(x1,y1,x2,y2);
-         }
-         app.ShowPopup(val);
-     }
-}
-function getData(row,col)
-{
-   var ret;
-   if (cellData.length < row +1)
-      return -1;  // represents unset
-   ret = cellData[row][col];
-   if(ret===undefined)
-      return -1;
-   return ret;
-}
-function setData(row,col,value)
-{
-   while (cellData.length < row +1)
-   {
-       cellData.push([]);
-   }
-   cellData[row][col]=value;
-}
-function btnSaveOnTouch()
-{
-    var data = JSON.stringify(cellData);
-    app.WriteFile("/sdcard/picData",data)
-}
-</code>

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