graphic.c

avr LCM SSD1289 color Graphical LCD Display Driver and graphic library

/**************************************************************************************************
* File name		: graphic.c
* Programmer 	: jaruwit supa
* Web presence  : www.thaibestlink.com
* Note			: lcd graphic support
* Language		: avrGCC
* Hardware		: atmega16
* Date			: 01/05/2009
************************************************************************************************/

/* _____STANDARD INCLUDES____________________________________________________ */
#include <avr/io.h>
#include <stdlib.h>

/* _____PROJECT INCLUDES_____________________________________________________ */
#include "graphic.h"

/* _____LOCAL DEFINE_________________________________________________________ */

/* _____LOCAL VARIABLES______________________________________________________ */

/* _____LOCAL FUNCTIONS______________________________________________________ */

/* _____PUBLIC FUNCTIONS_____________________________________________________ */

/*********************************************************************
* Function     : void Line(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2)
* Description  : Draw a line on a graphic LCD using Bresenham's
* PreCondition : SetColor()
* Input        : x1,y1 - starting coordinates
*              : x2,y2 - ending coordinates
* Output       : none
* Note         : none
********************************************************************/
void Line(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2)
{
	signed int  x, y, addx, addy, dx, dy;
	signed long P;
	int i;
/*
	if (x1>x2)
	{
		dx = x1; x1 = x2; x2 = dx;
		dy = y1; y1 = y2; y2 = dy;
	}

	// vertical line
	if ((x1 == x2) || (y1 == y2))
	{
		FillRectangle(x1, y1, x2, y2);
		return;
	}
*/
	dx = abs((signed int)(x2 - x1));
	dy = abs((signed int)(y2 - y1));
	x = x1;
	y = y1;

	addx = addy = 1;
	if(x1 > x2)
		addx = -1;
	if(y1 > y2)
		addy = -1;

	if (dx >= dy)
	{
		P = 2L*dy - dx;
		for (i=0; i<=dx; ++i)
		{
	  		PutPixel(x, y);
			if(P < 0)
	  		{
	    		P += 2*dy;
	    		x += addx;
	  		}
			else
			{
	    		P += 2*dy - 2*dx;
	    		x += addx;
	    		y += addy;
	  		}
		}
	}
	else
	{
		P = 2L*dx - dy;
		for(i=0; i<=dy; ++i)
		{
	  		PutPixel(x, y);
	  		if(P < 0)
	  		{
	    		P += 2*dx;
	    		y += addy;
	  		}
	  		else
	  		{
	    		P += 2*dx - 2*dy;
	    		x += addx;
	    		y += addy;
	  		}
		}
	}
}

/*********************************************************************
* Function     : void Rectangle(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2)
* Description  : Draw a rectangle on a graphic LCD
* PreCondition : SetColor()
* Input        : x1,y1 - starting coordinates
*              : x2,y2 - ending coordinates
* Output       : none
* Note         : none
********************************************************************/
void Rectangle(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2)
{
	FillRectangle(x1, y1, x2, y1);    // top
    FillRectangle(x1, y2, x2, y2);    // bottom
    FillRectangle(x1, y1, x1, y2);    // left
    FillRectangle(x2, y1, x2, y2);    // right
}

/*********************************************************************
* Function    : void RoundRectangle(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2, unsigned char rad, unsigned char fill)
* Description : Draws a beveled figure on the screen. 
* PreCondition: None
* Input       : x1, y1 - coordinate position of the upper left center
*		      : x2, y2 - coordinate position of the lower right center
*             : rad - defines the redius of the circle,
*             : fill - fill yes or no
* Output      : None
* Note        : None
********************************************************************/
void RoundRectangle(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2, unsigned int radius, unsigned char fill)
{
	signed int a, b, P;
	signed int bx, ay;

	if (fill)
	{
		a = 0;       // increment by 1
		b = radius;  // decrement by 1 using P
		P = 1 - radius;
		bx = b;
		ay = a;
		
		FillRectangle(x1, y1-radius+1, x2, y2+radius-1);
		do
		{
			if (bx != b)
			{
				FillRectangle(x1-bx, y1-ay, x1-bx, y2+ay); // left in
				FillRectangle(x2+bx, y1-ay, x2+bx, y2+ay); // right in
				bx = b;
			}
      		ay = a;
			if (a != b)
			{ 
				FillRectangle(x1-a, y1-b, x1, y2+b); // left out
				FillRectangle(x2  , y1-b, x2+a, y2+b); // rigth out
      		}
			if(P < 0)
				P+= 3 + 2*a++;
			else
				P+= 5 + 2*(a++ - b--);
		} while(a <= b);

		if (fill && (bx != b))
		{
			FillRectangle(x1-bx, y1-ay, x1-bx, y2+ay); // left in
			FillRectangle(x2+bx, y1-ay, x2+bx, y2+ay); // right in
		}
	}

	// draw broder
	{
		a = 0;       // increment by 1
		b = radius;  // decrement by 1 using P
		P = 1 - radius;
		bx = b;
		ay = a;

		do
		{
			if (a && (a != b))
			{
				PutPixel(x1-b, y1-a);
				PutPixel(x1-b, y2+a);
				PutPixel(x2+b, y1-a);
				PutPixel(x2+b, y2+a);
			}
			PutPixel(x1-a, y1-b);
			PutPixel(x2+a, y1-b);
			PutPixel(x1-a, y2+b);
			PutPixel(x2+a, y2+b);

			if(P < 0)
				P+= 3 + 2*a++;
			else
				P+= 5 + 2*(a++ - b--);
		} while(a <= b);

		FillRectangle(x1       , y1-radius, x2       , y1-radius);	// top
		FillRectangle(x1       , y2+radius, x2       , y2+radius);	// bottom
		FillRectangle(x1-radius, y1       , x1-radius, y2       );	// left
		FillRectangle(x2+radius, y1       , x2+radius, y2       );	// right
	}
}
/*********************************************************************
* Function    : void Circle(unsigned int x, unsigned int y, unsigned int radius, unsigned char fill)
* Description : Draw a circle on the screen. 
* PreCondition: None
* Input       : x,y - the center of the circle
*             : rad - defines the redius of the circle,
*             : fill - fill yes or no
* Output      : None
* Note        : None
********************************************************************/
void Circle(unsigned int x, unsigned int y, unsigned int radius, unsigned char fill)
{
   signed int a, b, P;
   a = 0;
   b = radius;
   P = 1 - radius;

   do
   {
      if(fill)
      {
         FillRectangle(x-a, y+b, x+a, y+b);
         FillRectangle(x-a, y-b, x+a, y-b);
         FillRectangle(x-b, y+a, x+b, y+a);
         FillRectangle(x-b, y-a, x+b, y-a);
      }
      else
      {
         PutPixel(a+x, b+y);
         PutPixel(b+x, a+y);
         PutPixel(x-a, b+y);
         PutPixel(x-b, a+y);
         PutPixel(b+x, y-a);
         PutPixel(a+x, y-b);
         PutPixel(x-a, y-b);
         PutPixel(x-b, y-a);
      }

      if(P < 0)
         P+= 3 + 2*a++;
      else
         P+= 5 + 2*(a++ - b--);
    } while(a <= b);
}