For pedagogical purposes, I'm trying to set up a simple drawing canvas on
which to draw and display a single image with control of the individual
pixels. Efficiency is no concern. To this end, I have a MutableImage class
with getPixel and setPixel methods. Everything seems to work fine, except
when blitting the generated image, pixels from columns on the left side for
some reason also get displayed in columns about 2/3 to the right, e.g. in a
500 pixel wide image, the content of columns 0-100 gets erroneously drawn
also in columns ~300-400 (overwriting whatever should be in those columns).
My hack around this is to save my generated image to file, then load it
again with pyglet.image.load. When I then blit my generated image newly
loaded from the file, it displays properly. So if my data is getting saved
properly, does this mean there's a bug in blitting images after set_data?
p.s. I also get strange behavior in the saved .png. The generated image
displays correctly in my window, but the saved file doesn't match, almost
like a whole color channel is missing. Seems like *something* is screwy
with the channels.
Here's my code:
import pyglet
class MutableImage(object):
FORMAT = 'RGB'
def __init__(self, image):
self.image = image
self.imageData = image.get_data(MutableImage.FORMAT, image.width *
len(MutableImage.FORMAT))
self.dataList = list(self.imageData)
def getPixel(self, x, y):
'''Returns tuple of (r, g, b)'''
pixelIdx = x + (y * self.image.width)
byteIdx = pixelIdx * len(MutableImage.FORMAT)
return (
ord(self.dataList[byteIdx]),
ord(self.dataList[byteIdx + 1]),
ord(self.dataList[byteIdx + 2])
)
def setPixel(self, x, y, color):
''' color is tuple of (R, G, B) as integers 0-255 '''
# ignore requests to draw out of bounds
if self.inBounds(x, y):
pixelIdx = x + (y * self.image.width)
byteIdx = pixelIdx * len(MutableImage.FORMAT)
r, g, b = color
self.dataList[byteIdx] = chr(r)
self.dataList[byteIdx + 1] = chr(g)
self.dataList[byteIdx + 2] = chr(b)
def getImage(self):
''' return the current state of data '''
data = ''.join(self.dataList)
self.image.set_data(MutableImage.FORMAT, self.image.width *
len(MutableImage.FORMAT), data)
# without hack of saving as file then loading as file, a fraction
of left side
# gets redrawn on right side for no apparent reason when we blit
the image
self.image.save('hack-around.png')
return pyglet.image.load('hack-around.png')
def inBounds(self, x, y):
if x < self.image.width and y < self.image.height:
return True
return False
def clamp(self, x, y):
if x >= self.image.width:
x = self.image.width - 1
if y >= self.image.height:
y = self.image.height - 1
return (x, y)
def paintRectangle(self, lowerLeftCorner, upperRightCorner, color):
''' coords in (x, y) tuple '''
x1, y1 = lowerLeftCorner
x2, y2 = upperRightCorner
x1, y1 = self.clamp(x1, y1)
x2, y2 = self.clamp(x2, y2)
for x in range(x1, x2 + 1):
for y in range(y1, y2 + 1):
self.setPixel(x, y, color)
def copyRegion(self, src, dest, width, height):
''' src and dest (x, y) tuples of lower left corner of regions '''
pass
def paintImage(self, dest, srcImage):
''' dest specifies lower left corner where to draw the srcImage '''
mutableSrcImage = MutableImage(srcImage)
destX, destY = dest
for x in range(srcImage.width):
for y in range(srcImage.height):
color = mutableSrcImage.getPixel(x, y)
self.setPixel(x + destX, y + destY, color)
def displayWindow(image):
window = pyglet.window.Window(image.width, image.height, caption='image
render')
@window.event
def on_draw():
image.blit(0, 0)
pyglet.app.run()
mi = MutableImage(pyglet.image.create(500, 900))
mi.paintRectangle((100, 0), (500, 900), (0, 255, 0))
for x in range(50, 500):
mi.setPixel(x, 850, (255, 0, 0))
for x in range(50, 500):
mi.setPixel(x, 450, (255, 0, 0))
for x in range(50, 500):
mi.setPixel(x, 250, (255, 0, 0))
mi.paintRectangle((0, 0), (100, 100), (0, 255, 255))
mi.paintRectangle((450, 850), (500, 900), (0, 255, 255))
displayWindow(mi.getImage())
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