Mathematics

[Jan Lichtenbelt]

I will use the graphic LCD and I intend to draw a circle. Is it possible to use the mathematical functions like cosinus and sinus in Flowcode 4?

[Benj]

Hello Jan,

Yes this is possible.

[Jan Lichtenbelt]

Hello Ben,

I did not expect that it would be possible. I tried it directly. Declaring the variable A (float) and in the C-Code box I put: A= cos(1). But this results only in the message: unknown indentifier. What's wrong?

[Benj]

Hello,

In Flowcode PIC the trig functions are unavailable unless you use the HiTech compiler. A discussion on how this is done is available from here.

http://www.matrixmultimedia.com/mmforum ... =26&t=6812

My other suggestion would be to avoid the use of trig and instead use a look up table to calculate your COS and SIN values.

http://www.matrixmultimedia.com/mmforum ... =26&t=3543

This will probably be easier as you will be able to pre multiply up the cooordinates in your lookup table to define the size and location of the circle on the display.

[Jan Lichtenbelt]

I made an example of lookup table for both sinus and cosinus functions, based on Ben's suggestions in http://www.matrixmultimedia.com/mmforum ... =26&t=3543

The example uses 10 values stored in the EEPROM, instead of the C-program, for angles between 0, 10... 90 degrees. Angles between these values will be rounded to a mulple of 10. All angles are allowed even > 360 degree or negative angles.
The results can be shown in eg. the actual graphic display's (like E-blocks EB057 and EB058). X- and Y-scaling is possible.

Good luck.