character.c

ep7312 蜂鸣器源码

/*
 * $Id: character.c,v 1.2 2003/08/29 03:13:18 casic Exp $
 *
 * character.c : display characters on LCD
 *
 * Copyright (C) 2003 ynding ( [e-mail] )
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "color.h"
#include "graphic.h"
#include "character.h"
#include "hzk16x16.h"
#include "ascii.h"

/*
 * display an ascii character
 * x,y : coordinate of the start pixel
 * ascii_codes : the the bytes serial to be displayed 
 * the size of the ascii characters is 8*16
 * color : the color of the character
 */
void display_ascii(unsigned int x, unsigned int y, unsigned char* ascii_codes, COLOR color)
{
	int i = 0;

	/* total 16 bytes codes*/
	for ( i=0;i<16;++i ) {
		int j = 0;
		x += 8;

		for ( j=0;j<8;++j ) {
			--x;
			if ( ( ascii_codes[i] >> j ) & 0x1 ) {
				draw_dot(x,y,color);
			}
		}

		/* move to the next line : x axis unchanged, y axis increase 1 */
		++y;
	}

	return;
}

/*
 * display a Chinese character
 * x,y : coordinate of the start pixel
 * cnc_codes : the bytes serial to be displayed
 * the size of the Chinese characters is 16*16
 * color : the color of the character
 */
void display_cnc(unsigned int x, unsigned int y, unsigned char* cnc_codes, COLOR color)
{
	int i;

	/* total 2*16 bytes codes */
	for(i=0;i<16;i++) {
		int j = 0;
		for (j=0;j<2;++j) {

			int k = 0;
			x += 8*(j+1);

			for ( k=0;k<8;++k ){
				--x;
				if ( ( cnc_codes[2*i+j] >> k) & 0x1 ) {
					draw_dot(x,y,color);
				}
			}
		}

		/* move to the next line : x axis unchanged, y axis increase 1 */
		x -= 8;
		++y;
	}

	return;
}

/*
 * display a string,the string can contain
 * not only ascii characters but also Chinese characters
 *
 * x,y : the beginning coordinate of the string to be displayed
 * 0<=x<=39 : each line holds 40 bytes (each byte contain 8 pixels) horizontally
 * 0<=y<=14 : each line holds 16 pixels vertically
 *
 * so the whole LCD can display 40*15 ascii characters,
 * or 20*15 Chinese characters
 *
 * color : the color of the string 
 */
void display_string(unsigned int x, unsigned int y, char* str, COLOR color)
{
	unsigned char*  ptr;

	unsigned int    ch;
	unsigned int    cl;
	unsigned int    offset;

	while (*str){
		ch = (unsigned int)str[0];
		cl = (unsigned int)str[1];

		if ( (ch>=0xa1)&&(ch<0xf8) && (cl>=0xa1)&&(cl<0xff) ) { /* Chinese characters */

			/* if x reaches the end of a line,turn to the next line */
			if ( x==39 || x==40 ){
				x = 0;
				y += 1;
			}

			/* calculate the offset of the character in the array */
			offset = ( (ch-0xa1)*94+(cl-0xa1) )*32;
			/* calculate the pointer of the character */
			ptr = GB2312_16X16_FONT_BITMAP + offset;

			/* display the character */
			display_cnc(x*8, y*16, ptr, color);

			/* x axis increase 2 */
			x += 2;

			/* move to the next character */
			str += 2;       /* a Chinese character holds 2 bytes */

		}else{ /* ascii character */

			/* if x reaches the end of a line,turn to the next line */
			if ( x == 40 ) {
				x = 0;
				y += 1;
			}

			/* calculate the pointer of the character */
			ptr = ASCII_FONT_BITMAP + 16*ch;

			/* display the character */
			display_ascii(x*8, y*16, ptr, color);

			/* x axis increase 1 */
			x += 1;

			/* move to the next character */
			str++;  /* an ascii character holds 1 byte */
		}

	}

	return;
}