I first noticed this with a scaled sprite that I was using in Space Invaders, but it happens with unscaled sprites as well. The scaled one has a red border all around. The unscaled one has a red border on the white squares and a white border on the red squares. Most peculiar. Thanks for all you do!
function setup()
map4 = image(4,4)
for x = 1,4 do
for y = 1,4 do
if (x+y)%2 == 0 then
c = color(255,0,0)
else
c = color(255,255,255)
end
map4:set(x,y,c)
end
end
map128 = image(128,128)
for x = 1,128 do
xx = x//32
for y = 1,128 do
yy = y//32
if (xx +yy)%2 == 0 then
c = color(255,0,0)
else
c = color(255,255,255)
end
map128:set(x,y,c)
end
end
end
function draw()
background(200,200,200)
pushMatrix()
pushStyle()
spriteMode(CORNER)
translate(WIDTH/4,HEIGHT/2)
sprite(map128,0,0)
translate(WIDTH/4,0)
scale(32)
sprite(map4,0,0)
popStyle()
popMatrix()
end
For the scaled one - add noSmooth() to the start of the draw function. It’ll switch off the antialiasing (which is creating the red border I suspect)
For the other one, try running the for x and for y between 0 and 127 instead of 1 and 128 to resolve. I think it is to do with the origin of the image being 0,0 or 1,1 in terms of the image:set call (I can’t remember which way round). It’s caused me no end of hassle with sprite sheets as it also affects the image:copy function.
Image “get” goes from 1 to the image size. Outside of that range and you’ll get an error message. Image “set” doesn’t seem to matter. There’s no error message if you use 0 or go beyond the image size.
@RonJeffries I’m not following what you mean in your above post by “bug in the mod”. Also, by scale 1, do you mean comment out the scale(32) line. I commented out the scale(32) and put noSmooth() above spriteMode(CORNER). When I run it, I see both sprites. One is normal size and the other one is really small and barely visible. It’s to the right bottom of the visible sprite about 1/2 inch away. If I’m totally off about what you mean, explain more.
PS. OK, I think I know what you mean by “bug in mod”. Do you mean the %2 in the line if (xx +yy)%2 == 0 which cause the small white/red line to the right and top of the square. If that’s what you mean, it’s not a bug but bad coding. Look at the code below which doesn’t have that problem. You need to do the for loops from 0 to127, not 1 to 128. You then need the x+1 and y+1 in the map128:set line.
If I’m still wrong about what you’re saying, let me know.
displayMode(FULLSCREEN)
function setup()
map128 = image(128,128)
for x = 0,127 do
xx = x//32
for y = 0,127 do
yy = y//32
if (xx+yy)%2 == 0 then
c = color(255,0,0)
else
c = color(255,255,255)
end
map128:set(x+1,y+1,c)
end
end
end
function draw()
background(200,200,200)
noSmooth()
sprite(map128,400,500)
end
noSmooth makes the other go away.