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Frame-Aktion

// initialize drawing createEmptyMovieClip("holder_mc", 1); _root.bitmap = new flash.display.BitmapData(200, 200, true, 0xFFFFFFFF); holder_mc.attachBitmap(_root.bitmap, 10, "auto", true); // go through all rows and columns for (px = 0; px < 200; px = px + 1) { for (py = 0; py < 200; py = py + 1) { g = graph2d(px, py); color = (g << 16 | g << 8 | g); pixel(px, py, color); } } // enlarge bitmap-view holder_mc._xscale = 200; holder_mc._yscale = 200; function graph2d(px, py) { g = (sine(6 * px) % 50) + (Math.abs(cosine(14 * py))); // sine+abs(cosine -> values between -1 and 2 g = stretch(g, 85, 85); // center 85, amplitude -85 + 2*85 -> values between 0 und 255 return g; } function pixel(px, py, color) { _root.bitmap.setPixel(px, py, color); } function sine(x) { // sine conversion for values // between 0 and 400 (stage width) s = Math.sin(x * 2 * Math.PI / 400); return s; } function cosine(x) { // cosine conversion for values // between 0 and 400 (stage width) s = Math.cosin(x * 2 * Math.PI / 400); return s; } function stretch(value, center, amplitude) { // scales and shifts value st = int(value * amplitude + center); return st; }

// initialize drawing var drawing:MovieClip = new MovieClip(); var bitmapdata = new BitmapData(200, 200, true, 0xFFFFFFFF); var bitmap = new Bitmap(bitmapdata); bitmap.smoothing = true; drawing.addChild(bitmap); this.addChild(drawing); // go through all rows and columns for (var px = 0; px < 200; px = px + 1) { for (var py = 0; py < 200; py = py + 1) { var g = graph2d(px, py); var color = (g << 16 | g << 8 | g); pixel(px, py, color); } } // enlarge bitmap-view drawing.scaleX = 2; drawing.scaleY = 2; function graph2d(px:int, py:int) { // sine+abs(cosine -> values between -1 and 2 g=(sinus(6*px) % 50) + (Math.abs(cosinus(14*py))) ; // center 85, amplitude -85 + 2*85 -> values between 0 und 255 g = stretch(g, 85, 85); return g; } function pixel(px:int, py:int, color:int) { bitmapdata.setPixel(px, py, color); } function sinus(x:int) { // sine conversion for values // between 0 and 400 (stage width) var s = Math.sin(x * 2 * Math.PI/ 400); return s; } function cosinus(x:int) { // cosine conversion for values // between 0 and 400 (stage width) var s = Math.cos(x * 2 * Math.PI/ 400); return s; } function stretch(value:Number, center:int, amplitude:int) { // scales and shifts value var st = int(value * amplitude + center); return st; }

Dieses Beispiel zeigt ein oszillierendes, organisch anmutendes Muster von Grauwerten. Die Funktion graph2d berechnet eine Kombination von Sinus und Cosinus, und der Absolutfunktion Math.abs aus den zwei Ausgangswerten px und py und stellt das Ergebnis als eine Art Höhenkurve oder Heatmap dar.

verwandt mit: Absolut-Funktion

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