Noob here! Need help drawing shapes on screen!

Forum 2005-2010 (read only) Software Syntax & Programs
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Well I'm at very best a beginner in programming and electronics in general. I'm completely lost when it comes to drawing shapes and what not, heck I was excited when I got to draw a line! The library was made from the sample code, since it was a bit overwhelming for my noobness, was lucky enough to find somebody who converted it into a library! (Thanks again Thomas!)
http://elec.tkjweb.dk/blog/wp-content/uploads/NokiaLCD.zip

I'm not really sure what all I should include here, so I'll shoot for what I think! Basically I'm trying to make it easy to make a circle by typing a few bytes rather than 8 lines of code.

Well here's the header file, I guess I'm just looking for the mathematical equation for a circle, and maybe a little help incorporating it in with my code.
Thanks in advance!

/*
  NokiaLCD.h - Library for a Nokia LCD with the epson driver.
  Created by Thomas Jespersen, July 2009 (Originally Arduino Sketch by Gravitech.us)
  Released into the public domain.
*/
#ifndef NokiaLCD_h
#define NokiaLCD_h

#include "WProgram.h"

class NokiaLCD
{
  public:
    void LCD_put_pixel(byte color, byte x, byte y);
    void lcd_set_box(byte x1, byte y1, byte x2, byte y2);
    void lcd_clear(byte color, byte x1, byte y1, byte x2, byte y2);
    void lcd_init();
    void draw_color_bar();
    void draw_text_line(byte fcolor, byte bcolor,byte x, byte y,char c);
    void lcd_draw_text(byte fcolor, byte bcolor, byte x, byte y,char *text);

  private:
    void shiftBits(byte b);
    void sendData(byte data);
    void sendCMD(byte data);
};

#endif
2

Google "Bresenham's circle drawing algorithm".

Or use y2 + y2 = r2 (don't you love Pythagorus?).
Don't forget eight-way symmetry.
Don't use sin/cos.
For extra points, avoid the use of "sqrt".

3

Well I kind of understand it, lol just not really sure how to implement it in code.. let alone, everytime I try to make a new function in the library, shows up that there's no such function with that name, even copy and pasting code already in the .cpp and changing the name by 1 letter, and changing it in the header, still same issue, me so confused.
But other than that,
including the nokiaLcd.lcd_put_pixel(byte color, byte x, byte y) into math equations in code, haha gosh I feel so .. noobish :smiley: Gotta love learning strictly from the internet!
Thanks again for the algorithm, now just to figure out how to use it and I'll be good to go! :smiley:

Here's a look at my code, right now just uses 2 Potentiometers and a button to draw, kinda ghetto etch a sketch! Kind of looking for the kind of code to use to make a menu per say, I've tried using void menu and setting em up previous to setup but yeah, no real clue how to include selecting a menu, highlighting your selection and whatnot.. but one thing at a time!
Thanks again!

/*
  Nokia LCD Demo - A demo using the NokiaLCD library for a Nokia LCD with the epson driver.
  Created by Thomas Jespersen, July 2009 (Originally Arduino Sketch by Gravitech.us)
  Released into the public domain.
*/

#include <LED13.h>
#include <NokiaLCD.h>

// Nokia LCD Setup settings
#define RED                  0xE0
#define GREEN                  0x1C
#define BLUE                  0x03
#define YELLOW                  0xFC
#define MAGENTA                  0xE3
#define CYAN                  0x1F
#define BLACK                  0x00
#define WHITE                  0xFF
NokiaLCD nokiaLcd;
LED13 led;

const int buttonPin = 10;
const int potPin = 2; // X
const int potPin2 = 3;// Y
int lcdDraw = 0;      // POT #1 Pixel  
int lcdDraw2 = 0;     // POT #2 Pixel
int buttonState = 0;  // Variable for reading pushbutton status
char analogString[4]; // potPin
char analogString2[4];// potPin2

void setup() 
{ 
  DDRD |= B01111100;   // Set SPI pins as output 
  PORTD |= B01111100;  // Set SPI pins HIGH
  
  pinMode(buttonPin, INPUT);
  nokiaLcd.lcd_init();
  delay(500);
  nokiaLcd.lcd_clear(BLUE,0,0,131,131);   // Sets background as blue
  nokiaLcd.lcd_clear(WHITE, 5,5,15,20);   // Small box, upper left
} 

void loop() 
{
 char text [50];
 
analogRead(potPin);
analogRead(potPin2);
itoa(lcdDraw, analogString, 10);  
itoa(lcdDraw2, analogString2, 10);

strcpy(text, "X:");
nokiaLcd.lcd_draw_text(BLUE, BLACK, 90, 115, text);
strcpy(text, analogString);     // First pot # input, printed in BLUE  X
nokiaLcd.lcd_draw_text(BLUE, BLACK, 100, 115, text);

strcpy(text, "Y:");
nokiaLcd.lcd_draw_text(RED, BLACK, 90, 105, text);
strcpy(text, analogString2);    // Second pot # input, printed in RED  Y
nokiaLcd.lcd_draw_text(RED, BLACK, 100, 105, text);

lcdDraw = analogRead(potPin)/8;
lcdDraw2 = analogRead(potPin2)/8;
buttonState = digitalRead(buttonPin);

strcpy(text, "Welcome!");
nokiaLcd.lcd_draw_text(RED, WHITE, 42, 3, text);


if (buttonState == HIGH) { 
nokiaLcd.LCD_put_pixel(YELLOW, lcdDraw, lcdDraw2);
LED13 on;
}
}
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