extend image settings with coordinates and preview

[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 7762362591c4664798a8f9344df9865b91d59fae..02654971e238b88020bf35a64a7046f7c1132de7 100644 (file)
--- 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();
 }