circle in help

[stan cartwright]

Demonstration program:

;Circle and filled circle commands on a graphic LCD.
;This uses the 2-place trigonometric routines found in the include file.

;Thomas Henry -- 4/17/2014

;----- Configuration

#chip 16F88, 8              ;PIC16F88 running at 8 MHz
#config mclr=off            ;reset handled internally

#include <GLCD.h>
#include <Trig2Places.h>

;----- Constants

;Pinout is shown for the LCM12864H-FSB-FBW
;graphical LCD available from Amazon.

;       +5V                 ;LCD pin 1
;       ground              ;LCD pin 2
;       Vo = wiper of pot   ;LCD pin 3
#define GLCD_DB0 PORTB.0    ;LCD pin 4
#define GLCD_DB1 PORTB.1    ;LCD pin 5
#define GLCD_DB2 PORTB.2    ;LCD pin 6
#define GLCD_DB3 PORTB.3    ;LCD pin 7
#define GLCD_DB4 PORTB.4    ;LCD pin 8
#define GLCD_DB5 PORTB.5    ;LCD pin 9
#define GLCD_DB6 PORTB.6    ;LCD pin 10
#define GLCD_DB7 PORTB.7    ;LCD pin 11
#define GLCD_CS2 PORTA.0    ;LCD pin 12
#define GLCD_CS1 PORTA.1    ;LCD pin 13
#define GLCD_RESET PORTA.2  ;LCD pin 14
#define GLCD_RW PORTA.3     ;LCD pin 15
#define GLCD_RS PORTA.4     ;LCD pin 16
#define GLCD_ENABLE PORTA.6 ;LCD pin 17
;       Vee = pot low side  ;LCD pin 18
;       backlight anode     ;LCD pin 19
;       backlight cathode   ;LCD pin 20

#define GLCD_TYPE GLCD_TYPE_KS0108
#define GLCD_WIDTH 128
#define GLCD_HEIGHT 64

;----- Variables

'None required.

;----- Program

GLCDCLS

circle(10,10,10)                  ;upper left
circle(117,10,10)                 ;upper right
filledcircle(63,31,10)            ;center
circle(63,31,20)                  ;center
filledcircle(10,53,10)            ;lower left
filledcircle(117,53,10)           ;lower right

Not really, the midpoint circle algorithm is an algorithm used to determine the points needed for rasterizing a circle. Bresenham's circle algorithm is derived from the midpoint circle algorithm

[Anobium]

Oh yes. I guess that at some point I thought.. what is the point of all that complexity and I changed to simple the standard GLCD commands, but, the point is the use of TRIG...

So, I have found the original post in the forum, corrected it, tested and update the the Help. https://github.com/GreatCowBASIC/Help/blob/main/source/trigonometrycircles.adoc

Good spot - I also found that you mentioned this... a few times.. So, apologies for not changing in the past.

[stan cartwright]

I just came across it looking in gcb help. Does a trig circle "looks nicer??"
The current GLCD circle plots one quadrant and copies it to the other 3. I doubt the trig circle did that, just plotted the whole circle but haven't checked.
I like the trig "fun"ctions but the "fun" takes me back to school days cos after, I never used trig until I used gcb.
Just sin and cos can do dials and moving needle pointer like analogue dial... that's all I mentioned. I was trying to copy nextion displays but cheaper... and easier than using nextion gui ide.
trig not used much but glad it's there. Who needs Pi ? :)

I figured how to use gcb trig from using and got better at it. Looking at old files, I was rubbish at first but seemed to have progressed, I want to do the rotating line box my self.
Started but didn't finish. Just move 8 points and join them. Is easy really with basic :) not