def copyPicFromTo( fromPic, toPic, offsetX, offsetY ):
# copy/overlay fromPic at offsets offsetX, offsetY
# on top of toPic
for pixel in getPixels( fromPic ):
x = getX( pixel )
y = getY( pixel )
fromColor = getColor( pixel )
setColor( getPixel( toPic, x+offsetX, y+offsetY ), fromColor )
def newCopyOf( pict ):
# given a picture, creates a new copy of it. Create a blank image
# and copy all the pixels from pict into the new image. returns
# the new image.
width = getWidth( pict )
height = getHeight( pict )
newPict = makeEmptyPicture( width, height )
copyPicFromTo( pict, newPict, 0, 0 )
return newPict
def replicateFromTo( fromPic, toPic ):
# make multiple copies of fromPic on top of toPic.
fromWidth = getWidth( fromPic )
toWidth = getWidth( toPic )
fromHeight = getHeight( fromPic )
toHeight = getHeight( toPic )
for offsetX in range( 0, toWidth-fromWidth+1,fromWidth ):
for offsetY in range( 0, toHeight-fromHeight+1,fromHeight ):
copyPicFromTo( fromPic, toPic, offsetX, offsetY )
def replicateFromTo2( fromPic, toPic ):
# Similar to replicateFromTo, but stop copying fromPic on a given row of toPic
# as soon as the center of fromPic covers a pixel that is not black.
fromWidth = getWidth( fromPic )
toWidth = getWidth( toPic )
fromHeight = getHeight( fromPic )
toHeight = getHeight( toPic )
for offsetX in range( 0, toWidth-fromWidth+1,fromWidth ):
for offsetY in range( 0, toHeight-fromHeight+1,fromHeight ):
middlePixel = getPixel( toPic, offsetX+fromWidth/2, offsetY+fromHeight/2 )
middleColor = getColor( middlePixel )
if distance( middleColor, black ) < 100:
copyPicFromTo( fromPic, toPic, offsetX, offsetY )
else:
break
