/**
* Copyright mutantleg ( http://wonderfl.net/user/mutantleg )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/mzSF
*/
package {
import flash.text.TextField;
import flash.events.Event;
import flash.display.Sprite;
public class FlashTest extends Sprite {
public var tri1a:Vec3 = new Vec3();
public var tri1b:Vec3 = new Vec3();
public var tri1c:Vec3 = new Vec3();
public var tri2a:Vec3 = new Vec3();
public var tri2b:Vec3 = new Vec3();
public var tri2c:Vec3 = new Vec3();
public var deb:TextField;
public function FlashTest()
{
deb = new TextField();
addChild(deb);
deb.width = 300;
deb.height = 100;
deb.multiline = true;
tri1a.x = 20;
tri1a.y = 80;
tri1b.x = 160;
tri1b.y = 160;
tri1c.x = 10;
tri1c.y = 160;
/*
tri2a.x = 20;
tri2a.y = 80;
tri2b.x = 160;
tri2b.y = 160;
tri2c.x = 10;
tri2c.y = 160;
*/
tri2a.x = 120;
tri2a.y = 200;
tri2b.x = 280;
tri2b.y = 280;
tri2c.x = 60;
tri2c.y = 340;
stage.addEventListener(Event.ENTER_FRAME, onEnter);
}//ctor
//public var w:Vec3 = new Vec3();
public function onEnter(e:Event):void
{
graphics.clear();
graphics.lineStyle(1, 0);
graphics.moveTo(tri1a.x, tri1a.y);
graphics.lineTo(tri1b.x, tri1b.y);
graphics.lineTo(tri1c.x, tri1c.y);
graphics.lineTo(tri1a.x, tri1a.y);
graphics.moveTo(tri2a.x, tri2a.y);
graphics.lineTo(tri2b.x, tri2b.y);
graphics.lineTo(tri2c.x, tri2c.y);
graphics.lineTo(tri2a.x, tri2a.y);
graphics.drawCircle(mouseX, mouseY, 4);
deb.text = "";
deb.appendText("mouse: x "+mouseX +" y " + mouseY+"\n");
var w:Vec3;
w = getBary2(mouseX, mouseY, 0,
tri1a.x, tri1a.y, 0,
tri1b.x, tri1b.y, 0,
tri1c.x, tri1c.y, 0);
deb.appendText("bary: x "+w.x+" y " + w.y+"\n");
w = getFromBary(w.x, w.y,
tri2a.x, tri2a.y, 0,
tri2b.x, tri2b.y, 0,
tri2c.x, tri2c.y, 0);
deb.appendText("frombary: x "+w.x+" y " + w.y+"\n");
graphics.drawCircle(w.x, w.y, 8);
}//onenter
public var ret:Vec3 = new Vec3();
//based on
//http://web.archive.org/web/20090609111431/http://www.crackthecode.us/barycentric/barycentric_coordinates.html
public function getBary2(
px:Number, py:Number, pz:Number,
x1:Number, y1:Number, z1:Number,
x2:Number, y2:Number, z2:Number,
x3:Number, y3:Number, z3:Number):Vec3
{
var x4:Number;
var y4:Number;
var z4:Number;
x4 = px;
y4 = py;
z4 = pz;
var deta:Number;
var deta1b:Number;
var deta2b:Number;
deta = (x1 * y2) - (x1 * y3) - (x2 * y1) + (x2 * y3) + (x3 * y1) - (x3 * y2);
deta1b = (x4 * y2) - (x4 * y3) - (x2 * y4) + (x2 * y3) + (x3 * y4) - (x3 * y2);
deta2b = (x1 * y4) - (x1 * y3) - (x4 * y1) + (x4 * y3) + (x3 * y1) - (x3 * y4);
var u:Number;
var v:Number;
var w:Number;
u = deta1b/deta;
v = deta2b/deta;
w = 1 - (u+v);
ret.x = u;
ret.y = v;
ret.z = w;
return ret;
}//getbary2
//based on
////http://www.blackpawn.com/texts/pointinpoly/default.html
public function getBary(
px:Number, py:Number, pz:Number,
x1:Number, y1:Number, z1:Number,
x2:Number, y2:Number, z2:Number,
x3:Number, y3:Number, z3:Number):Vec3
{
var u:Number;
var v:Number;
var vx1:Number;
var vy1:Number;
var vz1:Number;
var vx2:Number;
var vy2:Number;
var vz2:Number;
var vx0:Number;
var vy0:Number;
var vz0:Number;
var dot00:Number;
var dot01:Number;
var dot02:Number;
var dot11:Number;
var dot12:Number;
var invDenom:Number;
vx0 = x3 - x1;
vy0 = y3 - y1;
vz0 = z3 - z1;
vx1 = x2 - x1;
vy1 = y2 - y1;
vz1 = z2 - z1;
vx2 = px - x1;
vy2 = py - y1;
vz2 = pz - z1;
dot00 = vx0*vx0 + vy0*vy0 + vz0*vz0;
dot01 = vx0*vx1 + vy0*vy1 + vz0*vz1;
dot02 = vx0*vx2 + vy0*vy2 + vz0*vz2;
dot11 = vx1*vx1 + vy1*vy1 + vz1*vz1;
dot12 = vx1*vx2 + vy1*vy2 + vz1*vz2;
invDenom = 1.0 / (dot00*dot11 - dot01*dot01);
u = (dot11 * dot02 - dot01 * dot12) * invDenom;
v = (dot00 * dot12 - dot01 * dot02) * invDenom;
ret.x = u;
ret.y = v;
ret.z = 1 - ( u + v );
return ret;
}//getbary
public function getFromBary(
u:Number, v:Number,
x1:Number, y1:Number, z1:Number,
x2:Number, y2:Number, z2:Number,
x3:Number, y3:Number, z3:Number):Vec3
{
//u = ( 1 - u);
var w:Number;
w = 1 - (u+v);
ret.x = (u*x1 + v*x2 + w*x3);
ret.y = (u*y1 + v*y2 + w*y3);
ret.z = (u*z1 + v*z2 + w*z3);
return ret;
}//frombary
}//classend
}
internal class Vec3
{
public var x:Number = 0;
public var y:Number = 0;
public var z:Number = 0;
};//v3
