Help with screen:blit...

[Cybojanek]

Hi,
I recenley started coding and I recieve an error when I run my code. ( on my PC). It states "Bad argument #2 to 'blit' <image expected, got table>
Here is my code. If you could pleases help me fix it I would be very grateful....
THNX :)

arrow = Image.load("arrow.png")
grass = Image.load("grass.png")

screenwidth = 480 - arrow:width()
screenheight = 272 - arrow:width()

arrow = {}
arrow[1] = { x = 200, y = 50}

--***** Main Loop *****
while true do
pad = Controls.read()
screen:clear()

for a = 0, 14 do
for b = 0,8 do
screen:blit(32 * a, 32 * b, grass)
end
end

screen:blit(300,220,arrow)

if pad:left() and arrow[1].x > 0 then
arrow[1].x = arrow[1].x - 2
end

if pad:right() and arrow[1].x < screenwidth then
arrow[1].x = arrow[1].x + 2
end

if pad:up() and arrow[1].y > 0 then
arrow[1].y = arrow[1].y - 2
end

if pad:down() and arrow[1].y < screenheight then
arrow[1].y = arrow[1].y + 2
end

screen.waitVblankStart()
screen.flip()
end

[KawaGeo]

Code: Select all

arrow = Image.load("arrow.png")
grass = Image.load("grass.png")

screenwidth = 480 - arrow:width()
screenheight = 272 - arrow:width()

arrow = {}
arrow[1] = { x = 200, y = 50}
...
 

You had defined 'arrow' variable twice. The first definition was an image and the second was a table. That's why you got an error.

[Gary13579]

Ack, you beat me too it. I had my post done with color coding and everything :(

[daurnimator]

your all too quick for me :S

[KawaGeo]

Ack, you beat me too it. I had my post done with color coding and everything :(

Why don't you just post your colorful reply, anyway? We all are curious to see yours.

[Gary13579]

arrow = Image.load("arrow.png")
grass = Image.load("grass.png")

screenwidth = 480 - arrow:width()
screenheight = 272 - arrow:width()

arrow = {}
arrow[1] = { x = 200, y = 50}

--***** Main Loop *****
while true do
pad = Controls.read()
screen:clear()

for a = 0, 14 do
for b = 0,8 do
screen:blit(32 * a, 32 * b, grass)
end
end

screen:blit(300,220,arrow)

if pad:left() and arrow[1].x > 0 then
arrow[1].x = arrow[1].x - 2
end

if pad:right() and arrow[1].x < screenwidth then
arrow[1].x = arrow[1].x + 2
end

if pad:up() and arrow[1].y > 0 then
arrow[1].y = arrow[1].y - 2
end

if pad:down() and arrow[1].y < screenheight then
arrow[1].y = arrow[1].y + 2
end

screen.waitVblankStart()
screen.flip()
end

Pretty much just replace the blue words with "arrowImg".

BTW, you screwed your quote tag up. It says daurnimator wrote that, when it was me..

[KawaGeo]

Sorry, dude!

BTW, nice looking, indeed. :)