From eceff1c913ed3ce42776db2b5b1cf69e44f0b921 Mon Sep 17 00:00:00 2001
From: Robert Kaiser <kairo@kairo.at>
Date: Mon, 27 Oct 2008 18:11:56 +0100
Subject: [PATCH] extend image settings with coordinates and preview

---
 .../mandelbrot/content/image-settings.js      | 41 ++++++++++
 .../mandelbrot/content/image-settings.xul     | 54 +++++++++++--
 .../chrome/mandelbrot/content/mandelbrot.js   | 77 ++++++++++++++-----
 .../locales/en-US/image-settings.dtd          |  9 +++
 4 files changed, 158 insertions(+), 23 deletions(-)

diff --git a/xulapp/chrome/mandelbrot/content/image-settings.js b/xulapp/chrome/mandelbrot/content/image-settings.js
index c00c19a..d9af993 100644
--- a/xulapp/chrome/mandelbrot/content/image-settings.js
+++ b/xulapp/chrome/mandelbrot/content/image-settings.js
@@ -35,5 +35,46 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+var gColorPalette = [];
+
 function initSettings() {
 }
+
+function drawPreview() {
+  let canvas = document.getElementById("mbrotPreview");
+  let context = canvas.getContext("2d");
+
+  let Cr_min = parseFloat(document.getElementById("Cr_min").value);
+  let Cr_max = parseFloat(document.getElementById("Cr_max").value);
+  if ((Cr_min < -2) || (Cr_min > 2) ||
+      (Cr_max < -2) || (Cr_max > 2) || (Cr_min >= Cr_max)) {
+    Cr_min = -2.0; Cr_max = 1.0;
+  }
+
+  let Ci_min = parseFloat(document.getElementById("Ci_min").value);
+  let Ci_max = parseFloat(document.getElementById("Ci_max").value);
+  if ((Ci_min < -2) || (Ci_min > 2) ||
+      (Ci_max < -2) || (Ci_max > 2) || (Ci_min >= Ci_max)) {
+    Ci_min = -2.0; Ci_max = 1.0;
+  }
+
+  let iterMax = gPref.getIntPref("mandelbrot.iteration_max");
+  let algorithm = gPref.getCharPref("mandelbrot.use_algorithm");
+
+  context.fillStyle = "rgba(255, 255, 255, 127)";
+  context.fillRect(0, 0, canvas.width, canvas.height);
+
+  try {
+    var currentPalette = gPref.getCharPref("mandelbrot.color_palette");
+  }
+  catch(e) {
+    var currentPalette = '';
+  }
+  if (!currentPalette.length) {
+    currentPalette = 'kairo';
+  }
+  gColorPalette = getColorPalette(currentPalette);
+
+  drawLine(0, [Cr_min, Cr_max, Ci_min, Ci_max],
+              canvas, context, iterMax, algorithm);
+}
diff --git a/xulapp/chrome/mandelbrot/content/image-settings.xul b/xulapp/chrome/mandelbrot/content/image-settings.xul
index efe8288..04da656 100644
--- a/xulapp/chrome/mandelbrot/content/image-settings.xul
+++ b/xulapp/chrome/mandelbrot/content/image-settings.xul
@@ -44,6 +44,7 @@
 
 <prefwindow id="imgSettingsDlg"
             xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+            xmlns:html="http://www.w3.org/1999/xhtml"
             title="&imageSettings.title;"
             dlgbuttons="accept,cancel"
             ondialogaccept="callDrawImage();"
@@ -60,17 +61,60 @@
                   type="int"/>
       <preference id="mandelbrot.image.height" name="mandelbrot.image.height"
                   type="int"/>
+      <preference id="mandelbrot.last_image.Cr_min" name="mandelbrot.last_image.Cr_min"
+                  type="string"/>
+      <preference id="mandelbrot.last_image.Cr_max" name="mandelbrot.last_image.Cr_max"
+                  type="string"/>
+      <preference id="mandelbrot.last_image.Ci_min" name="mandelbrot.last_image.Ci_min"
+                  type="string"/>
+      <preference id="mandelbrot.last_image.Ci_max" name="mandelbrot.last_image.Ci_max"
+                  type="string"/>
     </preferences>
 
-    <groupbox label="&img.size.title;">
+    <groupbox>
+      <caption label="&coord.title;"/>
+      <description value="&coord.real.label;"/>
       <hbox flex="1">
-        <label value="&img.width.label;" control="imgWidth"/>
-        <textbox id="imgWidth" size="4" preference="mandelbrot.image.width"/>
+        <label value="&coord.min.label;" control="Cr_min"/>
+        <textbox id="Cr_min" size="10"
+                 preference="mandelbrot.last_image.Cr_min"/>
+        <label value="&coord.max.label;" control="Cr_max"/>
+        <textbox id="Cr_max" size="10"
+                 preference="mandelbrot.last_image.Cr_max"/>
       </hbox>
+      <description value="&coord.imag.label;"/>
       <hbox flex="1">
-        <label value="&img.height.label;" control="imgHeight"/>
-        <textbox id="imgHeight" size="4" preference="mandelbrot.image.heigth"/>
+        <label value="&coord.min.label;" control="Ci_min"/>
+        <textbox id="Ci_min" size="10"
+                 preference="mandelbrot.last_image.Ci_min"/>
+        <label value="&coord.max.label;" control="Ci_max"/>
+        <textbox id="Ci_max" size="10"
+                 preference="mandelbrot.last_image.Ci_max"/>
       </hbox>
     </groupbox>
+
+    <hbox flex="1">
+      <groupbox>
+        <caption label="&img.size.title;"/>
+        <hbox flex="1">
+          <label value="&img.width.label;" control="imgWidth"/>
+          <textbox id="imgWidth" size="4"
+                   preference="mandelbrot.image.width"/>
+        </hbox>
+        <hbox flex="1">
+          <label value="&img.height.label;" control="imgHeight"/>
+          <textbox id="imgHeight" size="4"
+                   preference="mandelbrot.image.height"/>
+        </hbox>
+      </groupbox>
+    
+      <groupbox>
+        <caption label="&preview.title;"/>
+        <hbox flex="1" pack="center" align="center">
+          <html:canvas id="mbrotPreview" width="50" height="50"></html:canvas>
+        </hbox>
+        <button id="previewButton" label="&previewDraw.label;" oncommand="drawPreview();"/>
+      </groupbox>
+    </hbox>
   </prefpane>
 </prefwindow>
diff --git a/xulapp/chrome/mandelbrot/content/mandelbrot.js b/xulapp/chrome/mandelbrot/content/mandelbrot.js
index 7762362..0265497 100644
--- a/xulapp/chrome/mandelbrot/content/mandelbrot.js
+++ b/xulapp/chrome/mandelbrot/content/mandelbrot.js
@@ -55,34 +55,75 @@ function drawImage() {
   document.getElementById("statusLabel").value =
       document.getElementById("mbrotBundle").getString("statusDrawing");
 
+  let Cr_min = -2.0;
+  let Cr_max = 1.0;
+  try {
+    Cr_min = parseFloat(gPref.getCharPref("mandelbrot.last_image.Cr_min"));
+    Cr_max = parseFloat(gPref.getCharPref("mandelbrot.last_image.Cr_max"));
+  }
+  catch (e) { }
+  if ((Cr_min < -2) || (Cr_min > 2) ||
+      (Cr_max < -2) || (Cr_max > 2) || (Cr_min >= Cr_max)) {
+    Cr_min = -2.0; Cr_max = 1.0;
+  }
+  gPref.setCharPref("mandelbrot.last_image.Cr_min", Cr_min);
+  gPref.setCharPref("mandelbrot.last_image.Cr_max", Cr_max);
+
+  let Ci_min = -1.5;
+  let Ci_max = 1.5;
+  try {
+    Ci_min = parseFloat(gPref.getCharPref("mandelbrot.last_image.Ci_min"));
+    Ci_max = parseFloat(gPref.getCharPref("mandelbrot.last_image.Ci_max"));
+  }
+  catch (e) { }
+  if ((Ci_min < -2) || (Ci_min > 2) ||
+      (Ci_max < -2) || (Ci_max > 2) || (Ci_min >= Ci_max)) {
+    Ci_min = -2.0; Ci_max = 1.0;
+  }
+  gPref.setCharPref("mandelbrot.last_image.Ci_min", Ci_min);
+  gPref.setCharPref("mandelbrot.last_image.Ci_max", Ci_max);
+
   let iterMax = gPref.getIntPref("mandelbrot.iteration_max");
   let algorithm = gPref.getCharPref("mandelbrot.use_algorithm");
 
-  context.fillStyle = "rgb(255, 255, 255)";
+  let iWidth = 0;
+  try {
+    iWidth = gPref.getIntPref("mandelbrot.image.width");
+  }
+  catch (e) { }
+  if ((iWidth < 10) || (iWidth > 5000)) {
+    iWidth = 300;
+    gPref.setIntPref("mandelbrot.image.width", iWidth);
+  }
+  let iHeight = 0;
+  try {
+    iHeight = gPref.getIntPref("mandelbrot.image.height");
+  }
+  catch (e) { }
+  if ((iHeight < 10) || (iHeight > 5000)) {
+    iHeight = 300;
+    gPref.setIntPref("mandelbrot.image.height", iHeight);
+  }
+
+  canvas.width = iWidth;
+  canvas.height = iHeight;
+
+  context.fillStyle = "rgba(255, 255, 255, 127)";
   context.fillRect(0, 0, canvas.width, canvas.height);
 
   gStartTime = new Date();
 
-  drawLine(0, canvas, context, iterMax, algorithm);
+  drawLine(0, [Cr_min, Cr_max, Ci_min, Ci_max],
+              canvas, context, iterMax, algorithm);
 }
 
-function drawLine(line, canvas, context, iterMax, algorithm) {
-    let Cr_min = -2.0;
-    let Cr_max = 1.0;
-    try {
-      Cr_min = gPref.getCharPref("mandelbrot.last_image.Cr_min");
-      Cr_max = gPref.getCharPref("mandelbrot.last_image.Cr_max");
-    }
-    catch (e) { }
+function drawLine(line, dimensions, canvas, context, iterMax, algorithm) {
+    let Cr_min = dimensions[0];
+    let Cr_max = dimensions[1];
     let Cr_scale = Cr_max - Cr_min;
 
-    let Ci_min = -1.5;
-    let Ci_max = 1.5;
-    try {
-      Cr_min = gPref.getCharPref("mandelbrot.last_image.Ci_min");
-      Cr_max = gPref.getCharPref("mandelbrot.last_image.Ci_max");
-    }
-    catch (e) { }
+    let Ci_min = dimensions[2];
+    let Ci_max = dimensions[3];
     let Ci_scale = Ci_max - Ci_min;
 
     let pixels = [];
@@ -95,7 +136,7 @@ function drawLine(line, canvas, context, iterMax, algorithm) {
     context.putImageData({width: canvas.width, height: pixels.length/4/canvas.width, data: pixels}, 0, line);
 
     if (img_y < canvas.height)
-      setTimeout(drawLine, 0, img_y, canvas, context, iterMax, algorithm);
+      setTimeout(drawLine, 0, img_y, dimensions, canvas, context, iterMax, algorithm);
     else
       EndCalc();
 }
diff --git a/xulapp/chrome/mandelbrot/locales/en-US/image-settings.dtd b/xulapp/chrome/mandelbrot/locales/en-US/image-settings.dtd
index dde6348..ea6c02b 100644
--- a/xulapp/chrome/mandelbrot/locales/en-US/image-settings.dtd
+++ b/xulapp/chrome/mandelbrot/locales/en-US/image-settings.dtd
@@ -38,6 +38,15 @@
 <!ENTITY imageSettings.title   "Image Settings">
 <!ENTITY DrawImageButton.label "Draw Image">
 
+<!ENTITY coord.title           "Coordinates">
+<!ENTITY coord.real.label      "Real">
+<!ENTITY coord.imag.label      "Imaginary">
+<!ENTITY coord.min.label       "From">
+<!ENTITY coord.max.label       "To">
+
 <!ENTITY img.size.title        "Image Size">
 <!ENTITY img.width.label       "Width">
 <!ENTITY img.height.label      "Height">
+
+<!ENTITY preview.title         "Preview">
+<!ENTITY previewDraw.label     "Preview">
-- 
2.35.3