Renesas / AsciiFont

Draw the character of the ASCII code.

Dependents:   mbed-os_Watson-IoT_ZXing_sample mbed-os_Watson-IoT_ZXing_sample MovPlayer GR-PEACH_HVC-P2_sample_client ... more

Fork of AsciiFont by Daiki Kato

AsciiFont

This is a library to draw the ASCII font characters.

Example

#include "mbed.h"
#include "AsciiFont.h"

#define WIDTH           (12)
#define HEIGHT          (16)
#define BYTE_PER_PIXEL  (1u)
#define STRIDE          (((WIDTH * BYTE_PER_PIXEL) + 7u) & ~7u) //multiple of 8

uint8_t text_field[STRIDE * HEIGHT];

//for debug
void print_text_field() {
    int idx = 0;

    for (int i = 0; i < HEIGHT; i++) {
        for (int j = 0; j < STRIDE; j++) {
            printf("%02x", text_field[idx++]);
        }
        printf("\r\n");
    }
    printf("\r\n");
}

int main() {
    AsciiFont ascii_font(text_field, WIDTH, HEIGHT, STRIDE, BYTE_PER_PIXEL);

    ascii_font.Erase(0xcc);
    ascii_font.DrawStr("AB", 0, 0, 0x11, 1);
    ascii_font.DrawChar('C', AsciiFont::CHAR_PIX_WIDTH,
                        AsciiFont::CHAR_PIX_HEIGHT, 0x22, 1);
    print_text_field(); //debug print

    ascii_font.Erase();
    ascii_font.DrawStr("D", 0, 0, 0xef, 2);
    print_text_field(); //debug print

    ascii_font.Erase(0x11, 6, 0, 6, 8);
    print_text_field(); //debug print
}


API

Import library
AsciiFont - AsciiFont Class Reference

Public Member Functions

AsciiFont (uint8_t *p_buf, int width, int height, int stride, int byte_per_pixel, uint32_t const colour=0)
Constructor: Initializes AsciiFont .
void Erase ()
Erase text field.
void Erase (uint32_t const colour)
Erase text field.
void Erase (uint32_t const colour, int x, int y, int width, int height)
Erase text field.
int DrawStr (char *str, int x, int y, uint32_t const colour, int font_size=1, uint16_t const max_char_num=0xffff)
Draw a string.
bool DrawChar (char c, int x, int y, uint32_t const colour, int font_size=1)
Draw a character.

Static Public Attributes

static const int CHAR_PIX_WIDTH = 6
The pixel width of a character.
static const int CHAR_PIX_HEIGHT = 8
The pixel height of a character.

Diff: AsciiFont.cpp

Revision:
2:d0bc8c2974e0
Parent:
1:fc1b3db025d6
Child:
3:0d8bc371d109
--- a/AsciiFont.cpp	Mon Oct 03 02:20:49 2016 +0000
+++ b/AsciiFont.cpp	Mon Oct 03 06:33:40 2016 +0000
@@ -2,23 +2,20 @@
 #include "AsciiFont.h"
 #include "ascii.h"
 
-#define FONT_WIDTH           6
-#define FONT_HEIGHT          8
-
 AsciiFont::AsciiFont(uint8_t * p_buf, int width, int height, int stride, int byte_per_pixel, uint32_t const colour) : 
     p_text_field(p_buf), max_width(width), max_height(height), buf_stride(stride), pixel_num(byte_per_pixel), background_colour(colour) {
     
 }
 
-void AsciiFont::erase() {
-    erase(background_colour, 0, 0, max_width, max_height);
+void AsciiFont::Erase() {
+    Erase(background_colour, 0, 0, max_width, max_height);
 }
 
-void AsciiFont::erase(uint32_t const colour) {
-    erase(colour, 0, 0, max_width, max_height);
+void AsciiFont::Erase(uint32_t const colour) {
+    Erase(colour, 0, 0, max_width, max_height);
 }
 
-void AsciiFont::erase(uint32_t const colour, int x, int y, int width, int height) {
+void AsciiFont::Erase(uint32_t const colour, int x, int y, int width, int height) {
     int idx_base;
     int wk_idx, i, j ,k;
 
@@ -34,24 +31,24 @@
     }
 }
 
-int AsciiFont::draw_string(char * str, int x, int y, uint32_t const colour, int font_size, uint16_t const max_char_num) {
+int AsciiFont::DrawString(char * str, int x, int y, uint32_t const colour, int font_size, uint16_t const max_char_num) {
     int char_num = 0;
 
     if ((str == NULL) || (font_size <= 0)) {
         return 0;
     }
     while ((*str != '\0') && (char_num < max_char_num)) {
-        if (draw_char(*str, x, y, colour, font_size) == false) {
+        if (DrawChar(*str, x, y, colour, font_size) == false) {
             break;
         }
         str++;
-        x += FONT_WIDTH * font_size;
+        x += CHAR_PIX_WIDTH * font_size;
         char_num++;
     }
     return char_num;
 }
 
-bool AsciiFont::draw_char(char c, int x, int y, uint32_t const colour, int font_size) {
+bool AsciiFont::DrawChar(char c, int x, int y, uint32_t const colour, int font_size) {
     int idx_base;
     int idx_y = 0;
     int wk_idx, i, j ,k, fw, fh;
@@ -62,10 +59,10 @@
     if (font_size <= 0) {
         return false;
     }
-    if ((x + (FONT_WIDTH * font_size)) >= max_width) {
+    if ((x + (CHAR_PIX_WIDTH * font_size)) > max_width) {
         return false;
     }
-    if ((y + (FONT_HEIGHT * font_size)) >= max_height) {
+    if ((y + (CHAR_PIX_HEIGHT * font_size)) > max_height) {
         return false;
     }
 
@@ -77,10 +74,10 @@
     idx_base = (x * pixel_num) + (buf_stride * y);
 
     /* Drawing */
-    for (i = 0; i < FONT_HEIGHT; i++) {
+    for (i = 0; i < CHAR_PIX_HEIGHT; i++) {
         for (fh = 0; fh < font_size; fh++) {
             wk_idx = idx_base + (buf_stride * idx_y);
-            for (j = 0; j < FONT_WIDTH; j++) {
+            for (j = 0; j < CHAR_PIX_WIDTH; j++) {
                 if (p_pattern[j] & mask) {
                     wk_colour = colour;
                 } else {