¶ 绘制方法
draw(vector_font, s, x, y {, fg, scale, alpha})
使用指定的 Hershey 矢量字体在显示屏上绘制文字，传入的坐标表示文字左下角的位置。可选参数 fg 用于设置文字前景色，默认值为 WHITE。scale 用于缩放文字大小，必须大于 0，可以是浮点数或整数，默认值为 1.0。alpha 的默认值为 255。
¶ draw_len 方法
draw_len(vector_font, s {, scale})
如果使用指定字体绘制，则返回字符串的宽度（以像素为单位）。
¶ 下载矢量字体库
GitHub：russhughes/st7789s3_esp_lcd/fonts/vector 中提供了 py 格式的矢量字体库，README 中包含所有字体的预览图。
也可以从 示例 lib 目录 下载转换后的 mpy 格式矢量字体库，它占用的 Flash 空间更少。
¶ 显示多种矢量字体并持续刷新
可通过 draw_len 方法获取待显示字符串的宽度，但部分矢量字体的实际高度会超过设定值。若要让文本框完全覆盖文字，需要修改相应代码以增加文本框高度。
""" BPI-Centi-S3 170x320 ST7789 显示屏 """
import st7789
import tft_config
import gotheng
import italicc
import romanc
import time
import gc
from math import ceil
"""
可使用以下默认颜色：
BLACK BLUE CYAN GREEN
MAGENTA RED YELLOW WHITE
TRANSPARENT
自定义 RGB 颜色：
color565(255,255,255)
"""
class DrawRect:
def __init__(self):
self.tft = None
self.text_y = None
self.text_x = None
self.rect_x = None
self.rect_y = None
self.rect_height = None
self.rect_width = None
def rect(self, tft, vector_font, scale, text, text_coord,
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=255):
self.tft = tft
self.rect_width = self.tft.draw_len(vector_font, text, scale)
self.rect_height = ceil(vector_font.HEIGHT * scale)
self.text_x = text_coord[0]
self.text_y = text_coord[1]
self.rect_x = ceil(self.text_x - vector_font.WIDTH * scale / 8)
self.rect_y = round(self.text_y - vector_font.HEIGHT * scale / 2 + 1)
self.tft.fill_rect(self.rect_x, self.rect_y,
self.rect_width, self.rect_height, bg, alpha_rect)
self.tft.draw(vector_font, text, self.text_x, self.text_y,
fg, scale, alpha_text)
def erase(self, bg):
buffer, _, _ = self.tft.jpg_decode(bg, self.rect_x, self.rect_y, self.rect_width, self.rect_height)
self.tft.blit_buffer(buffer, self.rect_x, self.rect_y, self.rect_width, self.rect_height)
def main():
try:
tft = tft_config.config(rotation=1)
tft.init()
jpg = 'pic_4.jpg'
tft.jpg(jpg, 0, 0)
text_x = 10
text_y = 20
text_list = [
" !\"#$%&'()*+,-./",
"0123456789:;<=>?",
"@ABCDEFGHIJKLMNO",
"PQRSTUVWXYZ[\]^_",
"`abcdefghijklmno",
"pqrstuvwxyz{|}~",
]
draw_rect_1 = DrawRect()
draw_rect_2 = DrawRect()
draw_rect_3 = DrawRect()
while True:
for i in text_list:
draw_rect_1.rect(tft, gotheng, 0.8, i, (text_x, text_y),
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=20)
draw_rect_2.rect(tft, italicc, 0.8, i, (text_x, text_y+32),
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=40)
draw_rect_3.rect(tft, romanc, 0.8, i, (text_x, text_y + 64),
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=60)
tft.show()
time.sleep(0.5)
draw_rect_1.erase(bg=jpg)
draw_rect_2.erase(bg=jpg)
draw_rect_3.erase(bg=jpg)
gc.collect()
except BaseException as err:
err_type = err.__class__.__name__
print('Err type:', err_type)
from sys import print_exception
print_exception(err)
finally:
tft.deinit()
print("tft deinit")
main()¶ 放大或缩小字体大小
可通过修改 draw 方法的 scale 值控制字体大小。
""" BPI-Centi-S3 170x320 ST7789 显示屏 """
import st7789
import tft_config
import gotheng
import italicc
import romanc
import time
import gc
from math import ceil
"""
可使用以下默认颜色：
BLACK BLUE CYAN GREEN
MAGENTA RED YELLOW WHITE
TRANSPARENT
自定义 RGB 颜色：
color565(255,255,255)
"""
class DrawRect:
def __init__(self):
self.tft = None
self.text_y = None
self.text_x = None
self.rect_x = None
self.rect_y = None
self.rect_height = None
self.rect_width = None
def rect(self, tft, vector_font, scale, text, text_coord,
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=255):
self.tft = tft
self.rect_width = self.tft.draw_len(vector_font, text, scale)
self.rect_height = ceil(vector_font.HEIGHT * scale)
self.text_x = text_coord[0]
self.text_y = text_coord[1]
self.rect_x = ceil(self.text_x - vector_font.WIDTH * scale / 8)
self.rect_y = round(self.text_y - vector_font.HEIGHT * scale / 2 + 1)
self.tft.fill_rect(self.rect_x, self.rect_y,
self.rect_width, self.rect_height, bg, alpha_rect)
self.tft.draw(vector_font, text, self.text_x, self.text_y,
fg, scale, alpha_text)
def erase(self, bg):
buffer, _, _ = self.tft.jpg_decode(bg, self.rect_x, self.rect_y, self.rect_width, self.rect_height)
self.tft.blit_buffer(buffer, self.rect_x, self.rect_y, self.rect_width, self.rect_height)
def main():
try:
tft = tft_config.config(rotation=1)
tft.init()
jpg = 'pic_4.jpg'
tft.jpg(jpg, 0, 0)
text_x = 10
text_y = 20
text_list = [
"!\"#$%&'()*",
"0123456789",
"ABCDEFGHI",
"PQRSTUVWX",
"abcdefghij",
"pqrstuvwxy",
]
draw_rect_1 = DrawRect()
draw_rect_2 = DrawRect()
draw_rect_3 = DrawRect()
while True:
for i in text_list:
draw_rect_1.rect(tft, romanc, 0.5, i, (text_x, text_y),
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=20)
draw_rect_2.rect(tft, romanc, 1, i, (text_x, text_y+24),
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=40)
draw_rect_3.rect(tft, romanc, 1.5, i, (text_x, text_y + 64),
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=60)
tft.show()
time.sleep(0.5)
draw_rect_1.erase(bg=jpg)
draw_rect_2.erase(bg=jpg)
draw_rect_3.erase(bg=jpg)
gc.collect()
except BaseException as err:
err_type = err.__class__.__name__
print('Err type:', err_type)
from sys import print_exception
print_exception(err)
finally:
tft.deinit()
print("tft deinit")
main()