Generating Scripts to create CapacitiveTouch Wheels

I am not sure the shape you are going for but how about just putting a

thin line with restrict or is it the keepout layer and the polygon

outline will clearance the wire on that layer.

Use the same curve on both polygon edges and the restrict layer. Use the

width of the line to set the clearance between the polygons.

Paul R.

On 02/17/2013 03:47 PM, patekd wrote:

I have written a C program that generates a Script to draw the pads of a capacitive touch wheel (sort of).

My challenge is using the ARC and CURVE when I draw my pads using the Polygon command. I am trying

to create wavey edges of the pads and I can do that but my problem is I cannot maintain the spacing

between the pads when I use an arc when I draw the adjacent polygon. I have included an image

of what I have achieved and the script that generated it.

 

I have used some pretty extensive trig and geometry to generate the script but it seams like when I

change the arc height, width etc. I am not getting the behavior that I would expect from my calculations.

 

I was hoping for some feedback.

 

1. The explination of arc and curve seem pretty straight forward. Have you ever found them hard to control

     in scripts?

2..Is there anyway to avoid using the arc or curve to draw smooth curves?

3. Should I just look at the time I spent doing this as wasted and move on with my life?

 

Thanks for any comments or ideas you might have

 

>

I 

 

CHANGE WIDTH .2032;

GRID mm;

SET WIRE_BEND 7;

Change layer 51;

CIRCLE (0 0) (30.0000 0);

CIRCLE (0 0) (5.0000 0);

CHANGE WIDTH .1;

WIRE (4.7815 1.4619) (28.6891 8.7712);

WIRE (-1.4619 4.7815) (-8.7712 28.6891);

WIRE (-4.7815 -1.4619) (-28.6891 -8.7711);

WIRE (1.4619 -4.7815) (8.7711 -28.6891);

CHANGE LAYER 1;

CHANGE WIDTH .1;

CHANGE WIDTH 0.0254;

GRID mm;

SET WIRE_BEND 2;

POLYGON (4.3950 2.3841) +67.0433 (-0.4811 4.9768) +120.00 (-4.0355 12.6118) -120.00 (-6.1910 20.8609) +120.00 (-8.7656 28.6908) -86.1801 (28.3809 9.7225) -120.00 (20.8586 6.4786) +120.00 (12.6101 3.7609) -120.00 (4.9211 1.6027) (4.3950 2.3841)

POLYGON (-2.3841 4.3950) +67.0433 (-4.9768 -0.4811) +120.00 (-12.6118 -3.7561) -120.00 (-20.8609 -6.4704) +120.00 (-28.6908 -8.7656) -86.1801 (-9.7224 28.3809) -120.00 (-6.1989 20.8586) +120.00 (-4.0406 12.6101) -120.00 (-1.3229 4.9211) (-2.3841 4.3950)

POLYGON (-4.3950 -2.3841) +67.0433 (0.4811 -4.9768) +120.00 (3.7561 -12.8912) -120.00 (6.4704 -20.5814) +120.00 (8.7656 -28.6908) -86.1801 (-28.3809 -9.7224) -120.00 (-20.5788 -6.1989) +120.00 (-12.8899 -4.0406) -120.00 (-4.6414 -1.3229) (-4.3950 -2.3841)

POLYGON (2.3841 -4.3950) +67.0433 (4.9768 0.4811) +120.00 (12.8912 4.0355) -120.00 (20.5814 6.1910) +120.00 (28.6908 8.7656) -86.1801 (9.7224 -28.3809) -120.00 (6.4786 -20.5788) +120.00 (3.7609 -12.8899) -120.00 (1.6027 -4.6414) (2.3841 -4.3950)

 

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To view any images and attachments in this post, visit:

http://www.element14.com/community/message/69945#69945/l/generating-scripts-to-create-capacitivetouch-wheels

 

Attachments:

Capacitive Wheel.pdf

 

patekd wrote:

I have written a C program that generates a Script to draw the pads

of a capacitive touch wheel (sort of).

My challenge is using the ARC and CURVE when I draw my pads using the

Polygon command. I am trying

to create wavey edges of the pads and I can do that but my problem is

I cannot maintain the spacing

between the pads when I use an arc when I draw the adjacent polygon.

I have included an image

of what I have achieved and the script that generated it.

 

I have used some pretty extensive trig and geometry to generate the

script but it seams like when I

change the arc height, width etc. I am not getting the behavior that

I would expect from my calculations.

 

I was hoping for some feedback.

 

1. The explination of arc and curve seem pretty straight forward.

Have you ever found them hard to control

in scripts?

2..Is there anyway to avoid using the arc or curve to draw smooth

curves?

3. Should I just look at the time I spent doing this as wasted and

move on with my life?

 

Thanks for any comments or ideas you might have

 

>

I 

 

CHANGE WIDTH .2032;

GRID mm;

SET WIRE_BEND 7;

Change layer 51;

CIRCLE (0 0) (30.0000 0);

CIRCLE (0 0) (5.0000 0);

CHANGE WIDTH .1;

WIRE (4.7815 1.4619) (28.6891 8.7712);

WIRE (-1.4619 4.7815) (-8.7712 28.6891);

WIRE (-4.7815 -1.4619) (-28.6891 -8.7711);

WIRE (1.4619 -4.7815) (8.7711 -28.6891);

CHANGE LAYER 1;

CHANGE WIDTH .1;

CHANGE WIDTH 0.0254;

GRID mm;

SET WIRE_BEND 2;

POLYGON (4.3950 2.3841) +67.0433 (-0.4811 4.9768) +120.00 (-4.0355

12.6118) -120.00 (-6.1910 20.8609) +120.00 (-8.7656 28.6908) -86.1801

(28.3809 9.7225) -120.00 (20.8586 6.4786) +120.00 (12.6101 3.7609)

-120.00 (4.9211 1.6027) (4.3950 2.3841)

POLYGON (-2.3841 4.3950) +67.0433 (-4.9768 -0.4811) +120.00 (-12.6118

-3.7561) -120.00 (-20.8609 -6.4704) +120.00 (-28.6908 -8.7656)

-86.1801 (-9.7224 28.3809) -120.00 (-6.1989 20.8586) +120.00 (-4.0406

12.6101) -120.00 (-1.3229 4.9211) (-2.3841 4.3950) POLYGON (-4.3950

-2.3841) +67.0433 (0.4811 -4.9768) +120.00 (3.7561 -12.8912) -120.00

(6.4704 -20.5814) +120.00 (8.7656 -28.6908) -86.1801 (-28.3809

-9.7224) -120.00 (-20.5788 -6.1989) +120.00 (-12.8899 -4.0406)

-120.00 (-4.6414 -1.3229) (-4.3950 -2.3841) POLYGON (2.3841 -4.3950)

+67.0433 (4.9768 0.4811) +120.00 (12.8912 4.0355) -120.00 (20.5814

6.1910) +120.00 (28.6908 8.7656) -86.1801 (9.7224 -28.3809) -120.00

(6.4786 -20.5788) +120.00 (3.7609 -12.8899) -120.00 (1.6027 -4.6414)

(2.3841 -4.3950)

 

--

To view any images and attachments in this post, visit:

 

http://www.element14.com/community/message/69945#69945/l/generating-scripts-to-create-capacitivetouch-wheels

 

Attachments:

Capacitive Wheel.pdf

Have confidence Eagle is depicting accurately what you tell it in your

script .  Out of interest I tried it using version 4 and got the same result

as your image.

I believe you have an calculation error. The wavey arcs are different enough

in height that they must cross over.

I avoid the arc and use the wire with curve/radius. But thats what you have

done, when you view the polygon elements.

So I would revisit the approach you have taken with the trigonomatry

/geometry.

The descriptions of the wavey paths should be the same if they straddle a

radial line (spoke). They will be the same length and run parallel to a

radial .They are displaced from the radial by half the spacing you desire.

So you may like to determine the start point and plot the wavey line as

polar coords. The adjacent wavely line will have the same direction and

values but start at a different point. Practice with straight lines.

All the best

Warren

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