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
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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
Public Member Functions |
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AsciiFont (uint8_t *p_buf, int width, int height, int stride, int byte_per_pixel, uint32_t const colour=0) | |
Constructor: Initializes
AsciiFont
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void | Erase () |
Erase text field.
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void | Erase (uint32_t const colour) |
Erase text field.
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void | Erase (uint32_t const colour, int x, int y, int width, int height) |
Erase text field.
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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.
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bool | DrawChar (char c, int x, int y, uint32_t const colour, int font_size=1) |
Draw a character.
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Static Public Attributes |
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static const int | CHAR_PIX_WIDTH = 6 |
The pixel width of a character.
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static const int | CHAR_PIX_HEIGHT = 8 |
The pixel height of a character.
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Diff: AsciiFont.h
- Revision:
- 0:99222c303e8f
- Child:
- 2:d0bc8c2974e0
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/AsciiFont.h Tue Sep 27 07:03:20 2016 +0000 @@ -0,0 +1,79 @@ +/**************************************************************************//** +* @file AsciiFont.h +* @brief AsciiFont API +******************************************************************************/ + +#ifndef ASCII_FONT_H +#define ASCII_FONT_H + +#include "mbed.h" + +/** A class to communicate a ascii_font + * + */ +class AsciiFont { +public: + + /** Constructor: Initializes AsciiFont. + * + * @param p_buf Text field address + * @param width Text field width + * @param height Text field height + * @param stride Buffer stride + * @param colour Background color + * @param byte_per_pixel Byte per pixel + */ + AsciiFont(uint8_t * p_buf, int width, int height, int stride, int byte_per_pixel, uint32_t const colour = 0); + + /** Erase text field + * + */ + void erase(); + + /** Erase text field + * + * @param colour Background color + */ + void erase(uint32_t const colour); + + /** Erase text field + * + * @param colour Background color + * @param x Erase start position of x coordinate + * @param y Erase start position of y coordinate + * @param width Erase field width + * @param height Erase field height + */ + void erase(uint32_t const colour, int x, int y, int width, int height); + + /** Draw a string + * + * @param str String + * @param x Drawing start position of x coordinate + * @param y Drawing start position of y coordinate + * @param color Font color + * @param font_size Font size (>=1) + * @param max_char_num The maximum number of characters + * @return The drawn number of characters + */ + int draw_string(char * str, int x, int y, uint32_t const colour, int font_size = 1, uint16_t const max_char_num = 0xffff); + + /** Draw a character + * + * @param x Drawing start position of x coordinate + * @param y Drawing start position of y coordinate + * @param color Font color + * @param font_size Font size (>=1) + * @return true if successfull + */ + bool draw_char(char c, int x, int y, uint32_t const colour, int font_size = 1); + +private: + uint8_t * p_text_field; + int max_width; + int max_height; + int buf_stride; + int pixel_num; + uint32_t background_colour; +}; +#endif