use let wherever possible in our code

[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 440911348f03d47ef5c8628c08776b28aeb5611e..9937799d10a6f715b2846ea583fa05e8f6c08118 100644 (file)
--- a/xulapp/chrome/mandelbrot/content/mandelbrot.js
+++ b/xulapp/chrome/mandelbrot/content/mandelbrot.js
@@ -1,9 +1,9 @@
 var gColorPalette = getColorPalette('kairo');
 
 function drawImage() {
-  var canvas = document.getElementById("mbrotImage");
+  let canvas = document.getElementById("mbrotImage");
   if (canvas.getContext) {
-    var context = canvas.getContext("2d");
+    let context = canvas.getContext("2d");
 
     // example:
     // context.fillStyle = "rgb(200,0,0)";
@@ -12,19 +12,19 @@ function drawImage() {
     // context.fillStyle = "rgba(0, 0, 200, 0.5)";
     // context.fillRect (30, 30, 55, 50);
 
-    var Cr_min = -2.0;
-    var Cr_max = 1.0;
-    var Cr_scale = Cr_max - Cr_min;
+    let Cr_min = -2.0;
+    let Cr_max = 1.0;
+    let Cr_scale = Cr_max - Cr_min;
 
-    var Ci_min = -1.5;
-    var Ci_max = 1.5;
-    var Ci_scale = Ci_max - Ci_min;
+    let Ci_min = -1.5;
+    let Ci_max = 1.5;
+    let Ci_scale = Ci_max - Ci_min;
 
-    var iterMax = 500;
+    let iterMax = 500;
 
-    for (var img_x = 0; img_x < canvas.width; img_x++) {
-      for (var img_y = 0; img_y < canvas.height; img_y++) {
-        var C = new complex(Cr_min + (img_x / canvas.width) * Cr_scale,
+    for (let img_x = 0; img_x < canvas.width; img_x++) {
+      for (let img_y = 0; img_y < canvas.height; img_y++) {
+        let C = new complex(Cr_min + (img_x / canvas.width) * Cr_scale,
                             Ci_min + (img_y / canvas.height) * Ci_scale);
         window.setTimeout(drawPoint, 0, context, img_x, img_y, C, iterMax);
       }
@@ -71,7 +71,7 @@ function mandelbrotValue (aC, aIterMax) {
 }
 
 function getColor(aIterValue, aIterMax) {
-  var standardizedValue = Math.round(aIterValue * 1024 / aIterMax);
+  let standardizedValue = Math.round(aIterValue * 1024 / aIterMax);
   return gColorPalette[standardizedValue];
   if (aIterValue == aIterMax) {
     return "rgb(0,0,0)";
@@ -86,48 +86,48 @@ function getColorPalette(palName) {
   var palette = [];
   switch (palName) {
     case 'bw':
-      for (var i = 0; i < 1024; i++) {
+      for (let i = 0; i < 1024; i++) {
         palette[i] = 'rgb(255,255,255)';
       }
       palette[1024] = 'rgb(0,0,0)';
       break;
     case 'kairo':
       // outer areas
-      for (var i = 0; i < 32; i++) {
-        var cc1 = Math.floor(i * 127 / 31);
-        var cc2 = 170 - Math.floor(i * 43 / 31);
+      for (let i = 0; i < 32; i++) {
+        let cc1 = Math.floor(i * 127 / 31);
+        let cc2 = 170 - Math.floor(i * 43 / 31);
         palette[i] = 'rgb(' + cc1 + ',' + cc2 + ',' + cc1 + ')';
       }
       // inner areas
-      for (var i = 0; i < 51; i++) {
-        var cc = Math.floor(i * 170 / 50);
+      for (let i = 0; i < 51; i++) {
+        let cc = Math.floor(i * 170 / 50);
         palette[32 + i] = 'rgb(' + cc + ',0,' + (170 + cc) + ')';
       }
       // corona
-      for (var i = 0; i < 101; i++) {
-        var cc = Math.floor(i * 200 / 100);
+      for (let i = 0; i < 101; i++) {
+        let cc = Math.floor(i * 200 / 100);
         palette[83 + i] = 'rgb(255,' + cc + ',0)';
       }
       // inner corona
-      for (var i = 0; i < 201; i++) {
-        var cc1 = 255 - Math.floor(i * 85 / 200);
-        var cc2 = 200 - Math.floor(i * 30 / 200);
-        var cc3 = Math.floor(i * 170 / 200);
+      for (let i = 0; i < 201; i++) {
+        let cc1 = 255 - Math.floor(i * 85 / 200);
+        let cc2 = 200 - Math.floor(i * 30 / 200);
+        let cc3 = Math.floor(i * 170 / 200);
         palette[184 + i] = 'rgb(' + cc1 + ',' + cc2 + ',' + cc3 + ')';
       }
-      for (var i = 0; i < 301; i++) {
-        var cc1 = 170 - Math.floor(i * 43 / 300);
-        var cc2 = 170 + Math.floor(i * 85 / 300);
+      for (let i = 0; i < 301; i++) {
+        let cc1 = 170 - Math.floor(i * 43 / 300);
+        let cc2 = 170 + Math.floor(i * 85 / 300);
         palette[385 + i] = 'rgb(' + cc1 + ',' + cc1 + ',' + cc2 + ')';
       }
-      for (var i = 0; i < 338; i++) {
-        var cc = 127 + Math.floor(i * 128 / 337);
+      for (let i = 0; i < 338; i++) {
+        let cc = 127 + Math.floor(i * 128 / 337);
         palette[686 + i] = 'rgb(' + cc + ',' + cc + ',255)';
       }
       palette[1024] = 'rgb(0,0,0)';
       break;
     case 'rainbow-linear1':
-      for (var i = 0; i < 256; i++) {
+      for (let i = 0; i < 256; i++) {
         palette[i] = 'rgb(' + i + ',0,0)';
         palette[256 + i] = 'rgb(255,' + i + ',0)';
         palette[512 + i] = 'rgb(' + (255 - i) + ',255,' + i + ')';
@@ -198,7 +198,7 @@ Case 5  'Regenbogen-Palette 2 (qu.)
 }
 
 function drawPoint(context, img_x, img_y, C, iterMax) {
-  var itVal = mandelbrotValue(C, iterMax);
+  let itVal = mandelbrotValue(C, iterMax);
   context.fillStyle = getColor(itVal, iterMax);
   context.fillRect (img_x, img_y, 1, 1); // x, y, width, height
 }