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/*
* FusionCharts Free v2
* http://www.fusioncharts.com/free
*
* Copyright (c) 2009 InfoSoft Global (P) Ltd.
* Dual licensed under the MIT (X11) and GNU GPL licenses.
* http://www.fusioncharts.com/free/license
*
* MIT License: http://www.opensource.org/licenses/mit-license.php
* GPL License: http://www.gnu.org/copyleft/gpl.html
*
* Date: 2009-08-21
*/
//--------------------------------------------------------------------------------
/*
Extended function definitions
This file contains extensions to the base MovieClip Object.
All the functions contained in this file can be used with any other Flash MX/+ movie for common procedures
*/
/*-------------------------------------------------------------
mc.drawWedge is a method for drawing pie shaped
wedges.
-------------------------------------------------------------*/
MovieClip.prototype.drawWedge = function(x, y, startAngle, arc, radius, yRadius, totalSlices) {
// ==============
// x, y = center point of the wedge.
// startAngle = starting angle in degrees.
// arc = sweep of the wedge. Negative values draw clockwise.
// radius = radius of wedge. If [optional] yRadius is defined, then radius is the x radius.
// yRadius = [optional] y radius for wedge.
// move to x,y position
this.moveTo(x, y);
// if yRadius is undefined, yRadius = radius
if (yRadius == undefined) {
yRadius = radius;
}
// Init vars
var segAngle, theta, angle, angleMid, segs, ax, ay, bx, by, cx, cy;
// limit sweep to reasonable numbers
if (Math.abs(arc)>360) {
arc = 360;
}
// Flash uses 8 segments per circle, to match that, we draw in a maximum
// of 45 degree segments. First we calculate how many segments are needed
// for our arc.
segs = Math.ceil(Math.abs(arc)/45);
// Now calculate the sweep of each segment.
segAngle = arc/segs;
// The math requires radians rather than degrees. To convert from degrees
// use the formula (degrees/180)*Math.PI to get radians.
theta = -(segAngle/180)*Math.PI;
// convert angle startAngle to radians
angle = -(startAngle/180)*Math.PI;
// draw the curve in segments no larger than 45 degrees.
if (segs>0) {
// draw a line from the center to the start of the curve
ax = x+Math.cos(startAngle/180*Math.PI)*radius;
ay = y+Math.sin(-startAngle/180*Math.PI)*yRadius;
//If we have more than 1 totalSlices, then we draw line to the center
if (totalSlices>1) {
this.lineTo(ax, ay);
} else {
this.moveTo(ax, ay);
}
// Loop for drawing curve segments
for (var i = 0; i<segs; i++) {
angle += theta;
angleMid = angle-(theta/2);
bx = x+Math.cos(angle)*radius;
by = y+Math.sin(angle)*yRadius;
cx = x+Math.cos(angleMid)*(radius/Math.cos(theta/2));
cy = y+Math.sin(angleMid)*(yRadius/Math.cos(theta/2));
this.curveTo(cx, cy, bx, by);
}
// close the wedge by drawing a line to the center
if (totalSlices>1) {
this.lineTo(x, y);
}
}
};
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