geometry.c

Go to the documentation of this file.

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/*----- Header-Files -------------------------------------------------------*/
#include <stdlib.h>                 /* Common types and functions           */
#include <stdint.h>                 /* Standard integer formats             */
#include "lcd.h"                    /* Main functionality and lld           */

/*----- Macros -------------------------------------------------------------*/

/*----- Data types ---------------------------------------------------------*/

/*----- Function prototypes ------------------------------------------------*/

/*----- Data ---------------------------------------------------------------*/

/*----- Implementation -----------------------------------------------------*/
void LCD_DrawLine(uint16_t Xstart, uint16_t Ystart, uint16_t Xstop,
                  uint16_t Ystop, LCDCOLOR Color) {

    int16_t dX = 0, dY = 0;
    int16_t sX, sY, err, e2;

    if (Xstop > Xstart) {
        dX = Xstop - Xstart;
    }
    else {
        dX = Xstart - Xstop;
    }
    if (Ystop > Ystart) {
        dY = Ystop - Ystart;
    }
    else {
        dY = Ystart - Ystop;
    }

    if (Xstart < Xstop) {
        sX = 1;
    }
    else {
        sX = -1;
    }
    if (Ystart < Ystop) {
        sY = 1;
    }
    else {
        sY = -1;
    }
    err = dX - dY;

    while (1) {
        LCD_WritePixel(Xstart, Ystart, Color);
        if (Xstart == Xstop && Ystart == Ystop) {
            break;
        }
        e2 = 2 * err;
        if (e2 > -dY) {
            err = err - dY;
            Xstart = Xstart + sX;
        }
        if (e2 < dX) {
            err = err + dX;
            Ystart = Ystart + sY;
        }
    }
}

void LCD_DrawRect(uint16_t Xpos, uint16_t Ypos, uint16_t width,
                  uint16_t height, LCDCOLOR Color) {

    LCD_DrawLine(Xpos, Ypos, Xpos + width, Ypos, Color);
    LCD_DrawLine(Xpos, Ypos, Xpos, Ypos + height, Color);
    LCD_DrawLine(Xpos + width, Ypos, Xpos + width, Ypos + height, Color);
    LCD_DrawLine(Xpos, Ypos + height, Xpos + width, Ypos + height, Color);
}

void LCD_DrawRectF(uint16_t Xpos, uint16_t Ypos, uint16_t width,
                   uint16_t height, LCDCOLOR Color) {

    LCD_FillArea(Xpos, Ypos, Xpos + width, Ypos + height, Color);
}

void LCD_DrawCircle(uint16_t Xpos, uint16_t Ypos, uint16_t Radius,
                    LCDCOLOR Color) {

    int16_t x, y;

    for (x = -Radius; x <= Radius; x++) {
        for (y = -Radius; y <= Radius; y++) {
            if (abs(x * x + y * y - Radius * Radius) <= Radius) {
        LCD_WritePixel(x + Xpos, y + Ypos, Color);
}
        }
    }
}

void LCD_DrawCircleF(uint8_t Xpos, uint16_t Ypos, uint16_t Radius,
                     LCDCOLOR Color) {

    int16_t x, y;
    int16_t radError;

    x = Radius;
    y = 0;
    radError = 1 - x;

    while (x >= y) {

            LCD_DrawLine(x + Xpos, y + Ypos, -x + Xpos, y + Ypos, Color);
            LCD_DrawLine(y + Xpos, x + Ypos, -y + Xpos, x + Ypos, Color);
            LCD_DrawLine(-x + Xpos, -y + Ypos, x + Xpos, -y + Ypos, Color);
            LCD_DrawLine(-y + Xpos, -x + Ypos, y + Xpos, -x + Ypos, Color);

        y++;
        if (radError < 0) {
            radError += 2 * y + 1;
        }
        else {
            x--;
            radError += 2 * (y - x + 1);
        }
    }
}

/*----- EOF ----------------------------------------------------------------*/

#ifdef __cplusplus
}
#endif /* __cplusplus */