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Day: April 5, 2004

Flash Stuff Here. Move Along…

2004-04-05 John Winkelman

In the middle of a cool project which is right on the cusp of being designered into oblivion, I discovered a nifty way to make things “snap to” a grid. Copy-and-paste into Flash MX/MX2004.

var gridSize = 20; // size of grid
 var nodeSize = 20; // size of individual nodes
 var nodes = 50; // number of nodes
 var radius = Stage.height/3; // radius of drawn circle
 var centerX = Stage.width/2; // center horizontally
 var centerY = Stage.height/2; // center vertically
 var steps = (Math.PI*2) / nodes; // math stuff
 var i=0;
 this.onEnterFrame = function() {
 if(i < nodes) {
 var m = _root.createEmptyMovieClip("node"+i,i);
 m.lineStyle(0,0x000000,100);
 m.beginFill(0x000000,10);
 m.moveTo(0,0);
 m.lineTo(nodeSize,0);
 m.lineTo(nodeSize,nodeSize);
 m.lineTo(0,nodeSize); m.lineTo(0,0);
 m.endFill();
 var mx = centerX + radius*Math.cos(steps*i); // horizontal snap
 if(mx%gridSize != 0) mx += (Math.floor(gridSize/2) - (mx%gridSize));
 var my = centerY + radius*Math.sin(steps*i); // vetical snap
 if(my%gridSize != 0) my += (Math.floor(gridSize/2) - (my%gridSize));
 m._x = mx;
 m._y = my;
 i++;
 radius += .1;
 } else {
 this.onEnterFrame = null;
 }
 }

It’s the modulus (mx % gridSize) which makes it cool. The Math.floor() which follows could also easily be Math.round() or Math.ceil(), depending on the constraints of the project.

Posted in ProgrammingTagged Flash comment on Flash Stuff Here. Move Along…

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