104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
#include "st7735_gfx.h"
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#include<stdlib.h>
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#include "st7735.h"
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#define _swap_uint8_t(a, b) { uint8_t t = a; a = b; b = t; }
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void st7735_draw_line(uint8_t x0, uint8_t y0, uint8_t x1, uint8_t y1, uint16_t color) {
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uint8_t steep_dir = abs(y1 - y0) > abs(x1 - x0);
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if (steep_dir) {
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_swap_uint8_t(x0, y0);
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_swap_uint8_t(x1, y1);
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}
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if (x0 > x1) {
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_swap_uint8_t(x0, x1);
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_swap_uint8_t(y0, y1);
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}
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int16_t dx, dy;
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dx = x1 - x0;
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dy = abs(y1 - y0);
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int16_t err = dx / 2;
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int16_t y_step;
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if (y0 < y1) {
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y_step = 1;
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} else {
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y_step = -1;
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}
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uint8_t seg = x0;
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uint8_t cur_x;
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for(cur_x = x0; cur_x <= x1; cur_x++) {
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err -= dy;
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if (err < 0) {
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if (steep_dir) {
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st7735_draw_fast_vline(y0, seg, cur_x - seg + 1, color);
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} else {
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st7735_draw_fast_hline(seg, y0, cur_x - seg +1, color);
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}
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y0 += y_step;
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err += dx;
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seg = cur_x + 1;
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}
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}
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// x0 incremented
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if (steep_dir) {
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st7735_draw_fast_vline(y0, seg, cur_x - seg, color);
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} else {
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st7735_draw_fast_hline(seg, y0, cur_x - seg, color);
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}
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}
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void st7735_draw_rect(uint8_t x, uint8_t y, uint8_t w, uint8_t h, uint16_t color) {
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if(w < 1 || h < 1) {
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return;
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}
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st7735_draw_fast_hline(x, y, w, color);
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st7735_draw_fast_hline(x, y + h - 1, w, color);
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st7735_draw_fast_vline(x, y, h, color);
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st7735_draw_fast_vline(x + w - 1, y, h, color);
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}
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void st7735_draw_circle(uint8_t x0, uint8_t y0, uint8_t r, uint16_t color) {
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int16_t f = 1 - r;
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int16_t ddF_x = 1;
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int16_t ddF_y = -2 * r;
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int16_t x = 0;
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int16_t y = r;
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st7735_draw_pixel(x0, y0 + r, color);
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st7735_draw_pixel(x0, y0 - r, color);
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st7735_draw_pixel(x0 + r, y0, color);
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st7735_draw_pixel(x0 - r, y0, color);
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while (x<y) {
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if (f >= 0) {
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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st7735_draw_pixel(x0 + x, y0 + y, color);
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st7735_draw_pixel(x0 - x, y0 + y, color);
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st7735_draw_pixel(x0 + x, y0 - y, color);
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st7735_draw_pixel(x0 - x, y0 - y, color);
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st7735_draw_pixel(x0 + y, y0 + x, color);
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st7735_draw_pixel(x0 - y, y0 + x, color);
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st7735_draw_pixel(x0 + y, y0 - x, color);
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st7735_draw_pixel(x0 - y, y0 - x, color);
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}
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}
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