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# Test font rendering using the FontTTF class
# This example allows you to try typing out some text in a given font, and
# supports the following keys:
# - Left/Right Arrow Keys: Cycles text alignment (left/right/center)
# - Up/Down Arrow Keys: Increases/decreases line height
# - Tab: Cycles font rendering style
import os
import sys
import sdl2.ext
from sdl2.sdlttf import TTF_FontLineSkip
from sdl2.ext import FontTTF, key_pressed, get_text_input, quit_requested
filepath = os.path.abspath(os.path.dirname(__file__))
RESOURCES = sdl2.ext.Resources(filepath, "resources")
BLACK_RGBA = (0, 0, 0, 255)
WHITE_RGBA = (255, 255, 255, 255)
def update_text(renderer, surface):
# Create a texture for the surface and render it to the screen
tx = sdl2.ext.Texture(renderer, surface)
renderer.clear(BLACK_RGBA)
renderer.copy(tx, dstrect=(10, 10))
renderer.present()
def run():
# Initialize SDL2 and create a Window and Renderer
sdl2.ext.init()
window = sdl2.ext.Window("Font Rendering", size=(800, 500))
renderflags = sdl2.SDL_RENDERER_SOFTWARE
if "-hardware" in sys.argv:
renderflags = (
sdl2.SDL_RENDERER_ACCELERATED | sdl2.SDL_RENDERER_PRESENTVSYNC
)
renderer = sdl2.ext.Renderer(window, flags=renderflags)
window.show()
# Create and initialize a font to render text with
fontpath = RESOURCES.get_path("tuffy.ttf")
font = FontTTF(fontpath, "20px", WHITE_RGBA)
# Add some additional font styles
styles = ['default', 'small', 'red', 'large', 'bg_fill']
font.add_style('small', '10px', WHITE_RGBA)
font.add_style('red', '20px', (255, 0, 0))
font.add_style('large', '35px', WHITE_RGBA)
font.add_style('bg_fill', '20px', BLACK_RGBA, WHITE_RGBA)
# Initialize font rendering options
line_height = TTF_FontLineSkip(font.get_ttf_font())
alignments = ["left", "center", "right"]
align_idx = 0
style_idx = 0
# Set a default string with which to render text
txt = u"Hi There!\nYou can edit this text using the keyboard and delete keys."
# Render the text and present it on the screen
txt_rendered = font.render_text(txt, width=780)
update_text(renderer, txt_rendered)
# Tell SDL2 to start reading Text Editing events. This allows for proper
# handling of unicode characters and modifier keys.
sdl2.ext.start_text_input()
# Create a simple event loop and wait for keydown, text editing, and quit events.
running = True
while running:
update_txt = False
events = sdl2.ext.get_events()
if quit_requested(events):
running = False
break
# Handle special keyboard events
if key_pressed(events):
# If any key pressed, re-render text
update_txt = True
# If backspace pressed, remove last character (if any) from txt
if key_pressed(events, sdl2.SDLK_BACKSPACE):
txt = txt[:-1]
# If enter/return pressed, insert a newline
elif key_pressed(events, sdl2.SDLK_RETURN):
txt = txt + u"\n"
# If left or right arrow pressed, change text alignment mode
elif key_pressed(events, "left"):
align_idx = (align_idx - 1) % 3
elif key_pressed(events, "right"):
align_idx = (align_idx + 1) % 3
elif key_pressed(events, "up"):
line_height += 1
elif key_pressed(events, "down"):
if line_height > 1:
line_height -= 1
# If tab pressed, cycle through the different font styles
elif key_pressed(events, "tab"):
style_idx = (style_idx + 1) % len(styles)
# Handle text input events
txt += get_text_input(events)
# If txt has changed since the start of the loop, update the renderer
if update_txt:
align = alignments[align_idx]
style = styles[style_idx]
txt_rendered = font.render_text(
txt, style, width=780, line_h=line_height, align=align
)
update_text(renderer, txt_rendered)
# Now that we're done, close everything down and quit SDL2
font.close()
renderer.destroy()
window.close()
sdl2.ext.quit()
return 0
if __name__ == "__main__":
sys.exit(run())
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