制作半透明矩形文本框
fill_rect 方法
fill_rect(x, y, width, height {, color, alpha})
设x, y坐标，绘制一个宽度为width，高度为height的填充矩形，颜色为color，可选设置alpha使其与背景混合。
color默认为BLACK黑色，alpha默认为255。
在图片上显示半透明矩形
我们可以在这个图片上显示一个半透明的黑色矩形框。
""" BPI-Centi-S3 170x320 ST7789 display """
import st7789
import tft_config
import gc
def main():
try:
tft = tft_config.config(rotation=1)
tft.init()
gc.collect()
tft.jpg('pic_5.jpg', 0, 0)
tft.fill_rect(20, int(170/2-32), 320-20-20, 32, st7789.BLACK, 60)
tft.show()
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()
在半透明矩形框内显示文本
""" BPI-Centi-S3 170x320 ST7789 display """
import st7789
import tft_config
import gc
import time
import vga1_bold_16x32
fg = st7789.WHITE
bg = st7789.TRANSPARENT
text_x = 20
text_y = int(170/2-32)
rect_width = 320-20-20
rect_height = 32
def main():
try:
tft = tft_config.config(rotation=1)
tft.init()
gc.collect()
tft.jpg('pic_5.jpg', 0, 0)
tft.fill_rect(text_x, text_y, rect_width, rect_height, st7789.BLACK, 60)
tft.text(vga1_bold_16x32, "Hello World!", text_x, text_y, fg, bg, 255)
tft.show()
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()
根据字符长度创建半透明文本框
""" BPI-Centi-S3 170x320 ST7789 display """
import st7789
import tft_config
import gc
import time
import vga1_bold_16x32
fg = st7789.WHITE
bg = st7789.TRANSPARENT
text_x = 20
text_y = int(170/2-32)
def text_rect(tft, font, font_size, text: str, text_coord,
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=255):
rect_width = font_size[0] * len(text)
rect_height = font_size[1]
tft.fill_rect(text_coord[0], text_coord[1],
rect_width, rect_height, bg, alpha_rect)
tft.text(font, text, text_coord[0], text_coord[1],
fg, st7789.TRANSPARENT, alpha_text)
def main():
try:
tft = tft_config.config(rotation=1)
tft.init()
gc.collect()
tft.jpg('pic_5.jpg', 0, 0)
text_rect(tft, vga1_bold_16x32, (16, 32), "Hello World!", (text_x, text_y),
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=80, alpha_rect=60)
text_rect(tft, vga1_bold_16x32, (16, 32), "It's MicroPython!", (text_x, text_y+32),
fg=st7789.WHITE, bg=st7789.BLACK, alpha_text=255, alpha_rect=60)
tft.show()
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()
