make mandelbrot build and roughly work as an extension

[mandelbrot.git] / xulapp / chrome / mandelbrot / content / mandelbrot.js

diff --git a/xulapp/chrome/mandelbrot/content/mandelbrot.js b/xulapp/chrome/mandelbrot/content/mandelbrot.js
index 788e198bd6059fba5259f21dce6bb6ab2b8b1a06..212e188a5e22a5eb6ca35372d6fccd82d9f7a1d2 100644 (file)
--- a/xulapp/chrome/mandelbrot/content/mandelbrot.js
+++ b/xulapp/chrome/mandelbrot/content/mandelbrot.js
@@ -45,6 +45,7 @@ var gCurrentImageData;
 
 function Startup() {
   updateIterMenu();
+  updateAlgoMenu();
   updatePaletteMenu();
   gMbrotBundle = document.getElementById("mbrotBundle");
   document.getElementById("statusLabel").value = gMbrotBundle.getString("statusEmpty");
@@ -401,18 +402,23 @@ function drawPoint(context, img_x, img_y, C, iterMax, algorithm) {
 /***** pure UI functions *****/
 
 var zoomstart;
+var imgBackup;
 
 function mouseevent(etype, event) {
   let canvas = document.getElementById("mbrotImage");
+  let context = canvas.getContext("2d");
   switch (etype) {
     case 'down':
-      if (event.button == 0)
+      if (event.button == 0) {
         // left button - start dragzoom
         zoomstart = {x: event.clientX - canvas.offsetLeft,
                      y: event.clientY - canvas.offsetTop};
+        imgBackup = context.getImageData(0, 0, canvas.width, canvas.height);
+      }
       break;
     case 'up':
       if (event.button == 0 && zoomstart) {
+        context.putImageData(imgBackup, 0, 0);
         let zoomend = {x: event.clientX - canvas.offsetLeft,
                        y: event.clientY - canvas.offsetTop};
 
@@ -447,6 +453,15 @@ function mouseevent(etype, event) {
         }
       }
       zoomstart = undefined;
+      break;
+    case 'move':
+      if (event.button == 0 && zoomstart) {
+        context.putImageData(imgBackup, 0, 0);
+        context.strokeStyle = "rgb(255,255,31)";
+        context.strokeRect(zoomstart.x, zoomstart.y,
+                           event.clientX - canvas.offsetLeft - zoomstart.x,
+                           event.clientY - canvas.offsetTop - zoomstart.y);
+      }
     break;
   }
 }