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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(7 * px); g = stretch(g, 128, 128); // center 128, amplitude +-128 -> 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 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) { g = sinus(7 * px); // center 128, amplitude +-128 -> values between 0 und 255 g = stretch(g, 128, 128); return g; } function pixel(px, py, color) { 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 stretch(value:Number, center:int, amplitude:int) { // scales and shifts value var st = int(value * amplitude + center); return st; }

Dieses Beispiel zeigt den Sinus der horizontalen Koordinate als Grauwert. Die Funktion graph2d rechnet mit dem Ausgangswert px und stellt das Ergebnis als eine Art Höhenkurve dar.

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