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import flash.geom.Point;
import com.senocular.drawing.PathSegment;
class com.senocular.drawing.PathLineSegment extends PathSegment {
// Constructor
public function PathLineSegment(startPt:Point, endPt:Point){
super(startPt, endPt);
_end = endPt;
_command = "lineTo";
}
// Public Properties
public function get length():Number {
if (isNaN(_length)){
_length = lineLength();
}
return _length;
}
// Public Methods
public function segment(t1:Number, t2:Number):PathSegment {
if (t2 == 1){
if (t1 == 0) return this;
return trim(t1, true);
}
var seg:PathSegment = trim(t2);
if (t1 != 0){
seg = seg.trim(t1/t2, true);
}
return seg;
}
public function trim(t:Number, fromStart:Boolean):PathSegment {
var startPt:Point;
var endPt:Point;
if (fromStart){
endPt = _start;
startPt = _end;
t = 1 - t;
}else{
startPt = _start;
endPt = _end;
}
var newstart:Point = startPt;
var newend:Point = startPt;
var dx:Number = endPt.x - startPt.x;
var dy:Number = endPt.y - startPt.y;
if (fromStart){
newstart = new Point(startPt.x + dx*t, startPt.y + dy*t);
}else{
newend = new Point(startPt.x + dx*t, startPt.y + dy*t);
}
return new __constructor__(newstart, newend);
}
public function pointAt(t:Number, startPt:Point, endPt:Point):Point {
if (!startPt) startPt = _start;
if (!endPt) endPt = _end;
var dx:Number = endPt.x - startPt.x;
var dy:Number = endPt.y - startPt.y;
return new Point(startPt.x + dx*t, startPt.y + dy*t);
}
public function angleAt(t:Number, startPt:Point, endPt:Point):Number {
if (!startPt) startPt = _start;
if (!endPt) endPt = _end;
return Math.atan2(endPt.y - startPt.y, endPt.x - startPt.x);
}
public function lineLength(startPt:Point, endPt:Point):Number {
if (!startPt) startPt = _start;
if (!endPt) endPt = _end;
var dx:Number = endPt.x - startPt.x;
var dy:Number = endPt.y - startPt.y;
return Math.sqrt(dx*dx + dy*dy);
}
}
