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"""2D drawing examples utilising the SDL2_gfx functions."""
import sys
import ctypes
from random import randint
import sdl2
import sdl2.sdlgfx
import sdl2.ext
# Draws random lines using the passed rendering context
def draw_lines(context, width, height):
# Reset the visible area with a black color.
context.clear(0)
# Split the visible area
whalf = width // 2 - 2
hhalf = height // 2 - 2
lw = 5
x0, x1 = whalf, whalf
y0, y1 = 0, height
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, x0, y0, x1, y1, lw,
0xFFFFFFFF)
x0, x1 = 0, width
y0, y1 = hhalf, hhalf
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, x0, y0, x1, y1, lw,
0xFFFFFFFF)
for x in range(15):
# In the first quadrant, draw normal lines
color = randint(0, 0xFFFFFFFF)
x0, x1 = randint(0, whalf), randint(0, whalf)
y0, y1 = randint(0, hhalf), randint(0, hhalf)
sdl2.sdlgfx.lineColor(context.sdlrenderer, x0, y0, x1, y1, color)
# In the second quadrant, draw aa lines
color = randint(0, 0xFFFFFFFF)
x0, x1 = randint(whalf + lw, width), randint(whalf + lw, width)
y0, y1 = randint(0, hhalf), randint(0, hhalf)
sdl2.sdlgfx.aalineColor(context.sdlrenderer, x0, y0, x1, y1, color)
# In the third quadrant, draw horizontal lines
color = randint(0, 0xFFFFFFFF)
x0, x1 = randint(0, whalf), randint(0, whalf)
y0 = randint(hhalf + lw, height)
sdl2.sdlgfx.hlineColor(context.sdlrenderer, x0, x1, y0, color)
# In the fourth quadrant, draw vertical lines
color = randint(0, 0xFFFFFFFF)
x0 = randint(whalf + lw, width)
y0, y1 = randint(hhalf + lw, height), randint(hhalf + lw, height)
sdl2.sdlgfx.vlineColor(context.sdlrenderer, x0, y0, y1, color)
# Draws random circles using the passed rendering context
def draw_circles(context, width, height):
# Reset the visible area with a black color.
context.clear(0)
# Split the visible area
wthird = width // 3 - 1
lw = 3
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, wthird, 0, wthird, height,
lw, 0xFFFFFFFF)
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, (2 * wthird + lw), 0,
(2 * wthird + lw), height, lw, 0xFFFFFFFF)
for x in range(15):
# In the first part, draw circles
color = randint(0, 0xFFFFFFFF)
x, y = randint(0, wthird), randint(0, height)
r = randint(1, max(min(x, wthird - x), 2))
sdl2.sdlgfx.circleColor(context.sdlrenderer, x, y, r, color)
# In the second part, draw aa circles
color = randint(0, 0xFFFFFFFF)
x, y = randint(0, wthird), randint(0, height)
r = randint(1, max(min(x, wthird - x), 2))
sdl2.sdlgfx.aacircleColor(context.sdlrenderer, x + wthird + lw, y, r,
color)
# In the third part, draw filled circles
color = randint(0, 0xFFFFFFFF)
x, y = randint(0, wthird), randint(0, height)
r = randint(1, max(min(x, wthird - x), 2))
sdl2.sdlgfx.filledCircleColor(context.sdlrenderer, x + 2 * (wthird + lw),
y, r, color)
# Draws random ellipsis using the passed rendering context
def draw_ellipsis(context, width, height):
# Reset the visible area with a black color.
context.clear(0)
# Split the visible area
wthird = width // 3 - 1
eheight = height // 4
lw = 3
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, wthird, 0, wthird, height,
lw, 0xFFFFFFFF)
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, (2 * wthird + lw), 0,
(2 * wthird + lw), height, lw, 0xFFFFFFFF)
for x in range(15):
# In the first part, draw ellipsis
color = randint(0, 0xFFFFFFFF)
x, y = randint(0, wthird), randint(0, height)
rx, ry = randint(1, max(min(x, wthird - x), 2)), randint(0, eheight)
sdl2.sdlgfx.ellipseColor(context.sdlrenderer, x, y, rx, ry, color)
# In the second part, draw aa ellipsis
color = randint(0, 0xFFFFFFFF)
x, y = randint(0, wthird), randint(0, height)
rx, ry = randint(1, max(min(x, wthird - x), 2)), randint(0, eheight)
sdl2.sdlgfx.aaellipseColor(context.sdlrenderer, x + wthird + lw, y,
rx, ry, color)
# In the third part, draw filled ellipsis
color = randint(0, 0xFFFFFFFF)
x, y = randint(0, wthird), randint(0, height)
rx, ry = randint(1, max(min(x, wthird - x), 2)), randint(0, eheight)
sdl2.sdlgfx.filledEllipseColor(context.sdlrenderer,
x + 2 * (wthird + lw), y, rx, ry,
color)
# Draws random rectangles using the passed rendering context
def draw_rects(context, width, height):
# Reset the visible area with a black color.
context.clear(0)
# Split the visible area
whalf = width // 2 - 2
hhalf = height // 2 - 2
lw = 5
x0, x1 = whalf, whalf
y0, y1 = 0, height
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, x0, y0, x1, y1, lw,
0xFFFFFFFF)
x0, x1 = 0, width
y0, y1 = hhalf, hhalf
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, x0, y0, x1, y1, lw,
0xFFFFFFFF)
for x in range(15):
# In the first quadrant, draw normal rectangles
color = randint(0, 0xFFFFFFFF)
x0, x1 = randint(0, whalf), randint(0, whalf)
y0, y1 = randint(0, hhalf), randint(0, hhalf)
sdl2.sdlgfx.rectangleColor(context.sdlrenderer, x0, y0, x1, y1, color)
# In the second quadrant, draw rounded rectangles
color = randint(0, 0xFFFFFFFF)
x0, x1 = randint(whalf + lw, width), randint(whalf + lw, width)
y0, y1 = randint(0, hhalf), randint(0, hhalf)
r = randint(0, max(x1 - x0, x0 - x1))
sdl2.sdlgfx.roundedRectangleColor(context.sdlrenderer, x0, y0, x1, y1, r,
color)
# In the third quadrant, draw horizontal lines
color = randint(0, 0xFFFFFFFF)
x0, x1 = randint(0, whalf), randint(0, whalf)
y0, y1 = randint(hhalf + lw, height), randint(hhalf + lw, height)
sdl2.sdlgfx.boxColor(context.sdlrenderer, x0, y0, x1, y1, color)
# In the fourth quadrant, draw vertical lines
color = randint(0, 0xFFFFFFFF)
x0, x1 = randint(whalf + lw, width), randint(whalf + lw, width)
y0, y1 = randint(hhalf + lw, height), randint(hhalf + lw, height)
r = randint(0, max(x1 - x0, x0 - x1))
sdl2.sdlgfx.roundedBoxColor(context.sdlrenderer, x0, y0, x1, y1, r,
color)
# Draws random triangles using the passed rendering context
def draw_trigons(context, width, height):
# Reset the visible area with a black color.
context.clear(0)
# Split the visible area
wthird = width // 3 - 1
lw = 3
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, wthird, 0, wthird, height,
lw, 0xFFFFFFFF)
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, (2 * wthird + lw), 0,
(2 * wthird + lw), height, lw, 0xFFFFFFFF)
for x in range(15):
# In the first part, draw triangles
color = randint(0, 0xFFFFFFFF)
x0, y0 = randint(0, wthird), randint(0, height)
x1, y1 = randint(0, wthird), randint(0, height)
x2, y2 = randint(0, wthird), randint(0, height)
sdl2.sdlgfx.trigonColor(context.sdlrenderer, x0, y0, x1, y1, x2, y2,
color)
# In the second part, draw aa triangles
color = randint(0, 0xFFFFFFFF)
x0, y0 = randint(0, wthird) + wthird + lw, randint(0, height)
x1, y1 = randint(0, wthird) + wthird + lw, randint(0, height)
x2, y2 = randint(0, wthird) + wthird + lw, randint(0, height)
sdl2.sdlgfx.aatrigonColor(context.sdlrenderer, x0, y0, x1, y1, x2, y2,
color)
# In the third part, draw filled triangles
color = randint(0, 0xFFFFFFFF)
x0, y0 = randint(0, wthird) + 2 * (wthird + lw), randint(0, height)
x1, y1 = randint(0, wthird) + 2 * (wthird + lw), randint(0, height)
x2, y2 = randint(0, wthird) + 2 * (wthird + lw), randint(0, height)
sdl2.sdlgfx.filledTrigonColor(context.sdlrenderer, x0, y0, x1, y1,
x2, y2, color)
# Draws random polygons using the passed rendering context
def draw_polygons(context, width, height):
# Reset the visible area with a black color.
context.clear(0)
# Split the visible area
wthird = width // 3 - 1
lw = 3
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, wthird, 0, wthird, height,
lw, 0xFFFFFFFF)
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, (2 * wthird + lw), 0,
(2 * wthird + lw), height, lw, 0xFFFFFFFF)
for x in range(5):
# In the first part, draw polygons
color = randint(0, 0xFFFFFFFF)
ptcount = randint(3, 10)
xlist, ylist = (sdl2.Sint16 * ptcount)(), (sdl2.Sint16 * ptcount)()
for k in range(ptcount):
xlist[k] = randint(0, wthird)
ylist[k] = randint(0, height)
xptr = ctypes.cast(xlist, ctypes.POINTER(sdl2.Sint16))
yptr = ctypes.cast(ylist, ctypes.POINTER(sdl2.Sint16))
sdl2.sdlgfx.polygonColor(context.sdlrenderer, xptr, yptr, ptcount, color)
# In the second part, draw aa polygons
color = randint(0, 0xFFFFFFFF)
ptcount = randint(3, 10)
xlist, ylist = (sdl2.Sint16 * ptcount)(), (sdl2.Sint16 * ptcount)()
for k in range(ptcount):
xlist[k] = randint(0, wthird) + wthird + lw
ylist[k] = randint(0, height)
xptr = ctypes.cast(xlist, ctypes.POINTER(sdl2.Sint16))
yptr = ctypes.cast(ylist, ctypes.POINTER(sdl2.Sint16))
sdl2.sdlgfx.aapolygonColor(context.sdlrenderer, xptr, yptr, ptcount,
color)
# In the third part, draw filled polygons
color = randint(0, 0xFFFFFFFF)
ptcount = randint(3, 10)
xlist, ylist = (sdl2.Sint16 * ptcount)(), (sdl2.Sint16 * ptcount)()
for k in range(ptcount):
xlist[k] = randint(0, wthird) + 2 * (wthird + lw)
ylist[k] = randint(0, height)
xptr = ctypes.cast(xlist, ctypes.POINTER(sdl2.Sint16))
yptr = ctypes.cast(ylist, ctypes.POINTER(sdl2.Sint16))
sdl2.sdlgfx.filledPolygonColor(context.sdlrenderer, xptr, yptr, ptcount,
color)
# Draw random elements using the passed rendering context
def draw_mixed(context, width, height):
# Reset the visible area with a black color.
context.clear(0)
# Split the visible area
whalf = width // 2 - 2
hhalf = height // 2 - 2
lw = 5
x0, x1 = whalf, whalf
y0, y1 = 0, height
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, x0, y0, x1, y1, lw,
0xFFFFFFFF)
x0, x1 = 0, width
y0, y1 = hhalf, hhalf
sdl2.sdlgfx.thickLineColor(context.sdlrenderer, x0, y0, x1, y1, lw,
0xFFFFFFFF)
for x in range(15):
# In the first quadrant, draw arcs
color = randint(0, 0xFFFFFFFF)
x0, y0 = randint(0, whalf), randint(0, hhalf)
rad = randint(0, min(whalf - x0, hhalf - y0))
start, end = randint(0, 360), randint(0, 360)
sdl2.sdlgfx.arcColor(context.sdlrenderer, x0, y0, rad, start, end, color)
# In the second quadrant, draw bezier curves
color = randint(0, 0xFFFFFFFF)
ptcount = randint(3, 10)
xlist, ylist = (sdl2.Sint16 * ptcount)(), (sdl2.Sint16 * ptcount)()
for k in range(ptcount):
xlist[k] = randint(whalf, width)
ylist[k] = randint(0, hhalf)
steps = randint(2, 10)
xptr = ctypes.cast(xlist, ctypes.POINTER(sdl2.Sint16))
yptr = ctypes.cast(ylist, ctypes.POINTER(sdl2.Sint16))
sdl2.sdlgfx.bezierColor(context.sdlrenderer, xptr, yptr, ptcount, steps,
color)
# In the third quadrant, draw pies
color = randint(0, 0xFFFFFFFF)
x0, y0 = randint(0, whalf), randint(hhalf + lw, height)
rad = randint(0, min(whalf - x0, y0 - (hhalf + lw)))
start, end = randint(0, 360), randint(0, 360)
sdl2.sdlgfx.pieColor(context.sdlrenderer, x0, y0, rad, start, end, color)
# In the fourth quadrant, draw filled pies
color = randint(0, 0xFFFFFFFF)
x0, y0 = randint(whalf + lw, width), randint(hhalf + lw, height)
rad = randint(0, min(x0 - (whalf + lw), y0 - (hhalf + lw)))
start, end = randint(0, 360), randint(0, 360)
sdl2.sdlgfx.filledPieColor(context.sdlrenderer, x0, y0, rad, start, end,
color)
def run():
# You know those from the helloworld.py example.
# Initialize the video subsystem, create a window and make it visible.
sdl2.ext.init()
window = sdl2.ext.Window("sdlgfx drawing examples", size=(800, 600))
window.show()
# Create a rendering context for the window. The sdlgfx module requires it.
# NOTE: Defaults to software rendering to avoid flickering on some systems.
if "-hardware" in sys.argv:
renderflags = sdl2.render.SDL_RENDERER_ACCELERATED | sdl2.render.SDL_RENDERER_PRESENTVSYNC
else:
renderflags = sdl2.render.SDL_RENDERER_SOFTWARE
context = sdl2.ext.Renderer(window, flags=renderflags)
# Retrieve and display renderer + available renderer info
info = sdl2.render.SDL_RendererInfo()
sdl2.SDL_GetRendererInfo(context.sdlrenderer, info)
print("\nUsing renderer: {0}".format(info.name.decode('utf-8')))
print("\nAvailable renderers:")
num_drivers = sdl2.SDL_GetNumRenderDrivers()
for i in range(0, num_drivers):
info = sdl2.render.SDL_RendererInfo()
sdl2.SDL_GetRenderDriverInfo(i, info)
print(" - " + info.name.decode('utf-8'))
# We implement the functionality as it was done in colorpalettes.py and
# utilise a mapping table to look up the function to be executed, together
# with the arguments they should receive
functions = ((draw_lines, (context, 800, 600)),
(draw_circles, (context, 800, 600)),
(draw_ellipsis, (context, 800, 600)),
(draw_rects, (context, 800, 600)),
(draw_trigons, (context, 800, 600)),
(draw_polygons, (context, 800, 600)),
(draw_mixed, (context, 800, 600))
)
# A storage variable for the function we are currently on, so that we know
# which function to execute next.
curindex = 0
draw_lines(context, 800, 600)
context.present()
# The event loop is nearly the same as we used in colorpalettes.py. If you
# do not know, what happens here, take a look at colorpalettes.py for a
# detailed description.
running = True
while running:
events = sdl2.ext.get_events()
for event in events:
if event.type == sdl2.SDL_QUIT:
running = False
break
if event.type == sdl2.SDL_MOUSEBUTTONDOWN:
curindex += 1
if curindex >= len(functions):
curindex = 0
# In contrast to colorpalettes.py, our mapping table consists
# of functions and their arguments. Thus, we get the currently
# requested function and argument tuple and execute the
# function with the arguments.
func, args = functions[curindex]
func(*args)
break
context.present()
sdl2.ext.quit()
return 0
if __name__ == "__main__":
sys.exit(run())
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