From: Robert Kaiser Date: Tue, 2 Sep 2008 18:45:51 +0000 (+0200) Subject: add patch by prefiks pointed out in http://home.kairo.at/blog/2008-08/kairo_at_mandel... X-Git-Url: https://git-public.kairo.at/?a=commitdiff_plain;h=2cb9a6b558e687bc39584fb763a9455b8db00204;p=mandelbrot.git add patch by prefiks pointed out in home.kairo.at/blog/2008-08/kairo_at_mandelbrot_going_public#p5179 --- diff --git a/xulapp/chrome/mandelbrot/content/mandelbrot.js b/xulapp/chrome/mandelbrot/content/mandelbrot.js index 5ab02a7..aab0f02 100644 --- a/xulapp/chrome/mandelbrot/content/mandelbrot.js +++ b/xulapp/chrome/mandelbrot/content/mandelbrot.js @@ -50,19 +50,23 @@ function Startup() { function drawImage() { let canvas = document.getElementById("mbrotImage"); - if (canvas.getContext) { - let context = canvas.getContext("2d"); + let context = canvas.getContext("2d"); - document.getElementById("statusLabel").value = - document.getElementById("mbrotBundle").getString("statusDrawing"); + document.getElementById("statusLabel").value = + document.getElementById("mbrotBundle").getString("statusDrawing"); + + let iterMax = gPref.getIntPref("mandelbrot.iteration_max"); + let algorithm = gPref.getCharPref("mandelbrot.use_algorithm"); - // example: - // context.fillStyle = "rgb(200,0,0)"; - // context.fillRect (10, 10, 55, 50); // x, y, width, height - // - // context.fillStyle = "rgba(0, 0, 200, 0.5)"; - // context.fillRect (30, 30, 55, 50); + context.fillStyle = "rgb(255, 255, 255)"; + context.fillRect(0, 0, canvas.width, canvas.height); + gStartTime = new Date(); + + drawLine(0, canvas, context, iterMax, algorithm); +} + +function drawLine(line, canvas, context, iterMax, algorithm) { let Cr_min = -2.0; let Cr_max = 1.0; let Cr_scale = Cr_max - Cr_min; @@ -71,20 +75,19 @@ function drawImage() { let Ci_max = 1.5; let Ci_scale = Ci_max - Ci_min; - let iterMax = gPref.getIntPref("mandelbrot.iteration_max"); - let algorithm = gPref.getCharPref("mandelbrot.use_algorithm"); - - gStartTime = new Date(); - - for (let img_x = 0; img_x < canvas.width; img_x++) { - for (let img_y = 0; img_y < canvas.height; img_y++) { + let pixels = []; + for (var img_y = line; img_y < canvas.height && img_y < line+8; img_y++) + for (let img_x = 0; img_x < canvas.width; img_x++) { 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, algorithm); + pixels.push.apply(pixels, drawPoint(context, img_x, img_y, C, iterMax, algorithm)); } - } - window.setTimeout(EndCalc, 0); - } + 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); + else + EndCalc(); } function EndCalc() { @@ -97,14 +100,16 @@ function EndCalc() { function complex(aReal, aImag) { this.r = aReal; this.i = aImag; - this.square = function() { +} +complex.prototype = { + square: function() { return new complex(this.r * this.r - this.i * this.i, 2 * this.r * this.i); - } - this.dist = function() { + }, + dist: function() { return Math.sqrt(this.r * this.r + this.i * this.i); - } - this.add = function(aComplex) { + }, + add: function(aComplex) { return new complex(this.r + aComplex.r, this.i + aComplex.i); } } @@ -141,9 +146,9 @@ function getColor(aIterValue, aIterMax) { // fallback to simple b/w if for some reason we don't have a palette if (aIterValue == aIterMax) - return "rgb(0,0,0)"; + return [0, 0, 0, 255]; else - return "rgb(255,255,255)"; + return [255, 255, 255, 255]; } function getColorPalette(palName) { @@ -151,53 +156,53 @@ function getColorPalette(palName) { switch (palName) { case 'bw': for (let i = 0; i < 1024; i++) { - palette[i] = 'rgb(255,255,255)'; + palette[i] = [255, 255, 255, 255]; } - palette[1024] = 'rgb(0,0,0)'; + palette[1024] = [0, 0, 0, 255]; break; case 'kairo': // outer areas 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 + ')'; + palette[i] = [cc1, cc2, cc1, 255]; } // inner areas for (let i = 0; i < 51; i++) { let cc = Math.floor(i * 170 / 50); - palette[32 + i] = 'rgb(' + cc + ',0,' + (170 + cc) + ')'; + palette[32 + i] = [cc, 0, (170-cc), 255]; } // corona for (let i = 0; i < 101; i++) { let cc = Math.floor(i * 200 / 100); - palette[83 + i] = 'rgb(255,' + cc + ',0)'; + palette[83 + i] = [255, cc, 0, 255]; } // inner corona 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 + ')'; + palette[184 + i] = [cc1, cc2, cc3, 255]; } 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 + ')'; + palette[385 + i] = [cc1, cc1, cc2, 255]; } for (let i = 0; i < 338; i++) { let cc = 127 + Math.floor(i * 128 / 337); - palette[686 + i] = 'rgb(' + cc + ',' + cc + ',255)'; + palette[686 + i] = [cc, cc, 255, 255]; } - palette[1024] = 'rgb(0,0,0)'; + palette[1024] = [0, 0, 0, 255]; break; case 'rainbow-linear1': 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 + ')'; - palette[768 + i] = 'rgb(' + i + ',' + (255 - i) + ',255)'; + palette[i] = [i, 0, 0, 255]; + palette[256 + i] = [255, i, 0, 255]; + palette[512 + i] = [255 - i, 255, i, 255]; + palette[768 + i] = [i, 255-i, 255, 255]; } - palette[1024] = 'rgb(0,0,0)'; + palette[1024] = [0, 0, 0, 255]; break; } /* @@ -272,8 +277,7 @@ function drawPoint(context, img_x, img_y, C, iterMax, algorithm) { itVal = mandelbrotValueNumeric(C, iterMax); break; } - context.fillStyle = getColor(itVal, iterMax); - context.fillRect (img_x, img_y, 1, 1); // x, y, width, height + return getColor(itVal, iterMax); } /***** pure UI functions *****/