Question

Draw a circle diagram

Asked by: jockejocke

I'm trying to create flash application with a type of circle diagram; a half circle with three circle sectors of different angles which may vary over time.

This half circle (180 degrees) is not the problem, nor is calculating the actual angle of the sector I'm trying to draw. For example, if the diagram shows 0%-100% and the sector should represent 0%-40%, it is just to do simple math (40/100) * 180 to get the angle. However, i do need to draw the triangle that should display the sector. The radius of my circle is 5.

How do I get the X and Y position from knowing an angle of 72 (se example image).
(The arrow is not the problem.)

Thank you for any help!

  • example.png
    • 57 KB

    Example of what I'm trying to accomplish

    Example of what I'm trying to accomplish

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Asked On
2009-08-05 at 01:36:21ID24627285
Tags

actionscript

,

flash

,

circle

,

math

,

radian

,

angle

,

geometry

Topics

Math & Science

,

ActionScript

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: ozoPosted on 2009-08-05 at 01:44:42ID: 25021229

-5 * cosine 72º
5 * sine 72º

 

by: CaptainCyrilPosted on 2009-08-05 at 01:46:08ID: 25021240

X = X of Center - Radius *Cos(angle)
Y = Y of Center + Radius *Sin(angle)

angle should be in radians
Radius is 5

 

by: jockejockePosted on 2009-08-05 at 03:37:21ID: 25021842

Thanks! It seems almost perfect ;)
It produces close to what I want now, but there are some error in my calculation.. When I calculate the angles I get the following results as plotted out in the attached image:
angle: 0, x: 16, y: 123
angle: -45, x: 67, y: 32
angle: -90, x: 171, y: 27
angle: -135, x: 230, y: 114
angle: -180, x: 187, y: 209

For some reason, it makes the circle larger than 180 degrees. For angles 0 and 180, y value should be exactly the same?

I'm attaching my AS code.

var centerX = 123;
var centerY = 123;
var radius = 112;
 
var minValue = 0;
var maxValue = 100;
var meter_steps = 5;
 
var singleStepValue = (radius*2)/meter_steps;
 
for (var i:Number = 0; i < meter_steps; i++ )
{
	var tAngle = ( ((i*singleStepValue)/(minValue-maxValue)) * 180 );
	var tX = ( centerX ) - ( radius * Math.cos ( tAngle ) );
	var tY = ( centerY ) + ( radius * Math.sin( tAngle ) );
	
	trace( "angle: "+Math.round(tAngle)+", x: "+Math.round(tX)+", y: "+Math.round(tY) );
	
	var tDot = new mc_point();
	mn.x = tX;
	mn.y = tY;
	addChild(mn);
}

                                              
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  • Bild-3.png
    • 55 KB

    The dots are spreaded out longer than 180 degrees.

    The dots are spreaded out longer than 180 degrees.
 

by: jockejockePosted on 2009-08-05 at 04:46:08ID: 25022250

Nevermind I managed, i got it all wrong and tried to do cosine and sine on degrees and not on radians. when i converted my degrees to radians, I get perfect result ;)
Thanks alot!

Attached the working code below for knowledgebase.

var centerX = 123;
var centerY = 123;
var radius = 112;
 
var minValue = 0;
var maxValue = 100;
var meter_steps = 5;
 
var singleStepValue = (radius*2)/meter_steps;
 
for (var i:Number = 0; i < meter_steps; i++ )
{
	var tAngle = ( ((i*singleStepValue)/(minValue-maxValue)) * 180 ) * ( math.PI/180 );
	var tX = ( centerX ) - ( radius * Math.cos ( tAngle ) );
	var tY = ( centerY ) + ( radius * Math.sin( tAngle ) );
	
	trace( "angle: "+Math.round(tAngle)+", x: "+Math.round(tX)+", y: "+Math.round(tY) );
	
	var tDot = new mc_point();
	mn.x = tX;
	mn.y = tY;
	addChild(mn);
}

                                              
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by: jockejockePosted on 2009-08-05 at 04:46:46ID: 31611802

Lovely!

20120131-EE-VQP-002

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