image processing

**taurus** · 10-14-2007

what do you mean by offset? how

**matsp** · 10-14-2007

If you consider it like a string rather than a picture, how would you move the first two letters to the back of a string? There are several ways to do it, and some are better than others, but simple will be good enough for now.

--
Mats

**taurus** · 10-14-2007

so i could use >> operator,
say data = data >> 3

?

**matsp** · 10-14-2007

Originally Posted by taurus

so i could use >> operator,
say data = data >> 3

?

That wasn't what I was after - in fact I'm quite confused as to how you came up with that.

--
Mats

**taurus** · 10-14-2007

oh i was just reading up on the >> operator.

for the string thing i would get the first character them move to last character.

for a 5 item array.......
so array[0] moves to array[4]

but am not sure on how to say move

**matsp** · 10-14-2007

Originally Posted by taurus

oh i was just reading up on the >> operator.

for the string thing i would get the first character them move to last character.

for a 5 item array.......
so array[0] moves to array[4]

but am not sure on how to say move

If it's an N array, and you want to move M characters, how would you do it then?

--
Mats

**taurus** · 10-14-2007

M-N?

i think

**taurus** · 10-14-2007

help

**matsp** · 10-14-2007

Originally Posted by taurus

M-N?

i think

What's that supposed to mean...

Describe HOW you'd move the characters around. Once you've got that sorted, you have the scrolling sorted.

--
Mats

**taurus** · 10-14-2007

well i think id take the last column in the array and move it to the first if i was to scroll right, but im still like confused on exactly how to do it, need a hint.

how would i set it to another area

cant i do something like using the >> operator?

**matsp** · 10-14-2007

The >> operator is essentially a divide by a power of 2, so for example x >> 3 is the same as x / (2 * 2 * 2), which turns out as x / 8. It doesn't do anything useful on strings (or any other arrays).

[In C++ the >> operator, and the complementary << operator, are used as a way to input and output (respectively) data from/to the console, as alternatives to scanf and printf - but in standard C, that's not meaningful at all. ]

--
Mats

**taurus** · 10-14-2007

hmmm, i dont know then how i can do it.

I need some help on this pls.
how to i move the colums to the other end for horizontal scroll?

**matsp** · 10-14-2007

Originally Posted by taurus

hmmm, i dont know then how i can do it.

I need some help on this pls.
how to i move the colums to the other end for horizontal scroll?

Start by writing a piece of code to scroll a piece of text around, based on:
str: char array with text in it.
n = strlen(str);
m = some number you've given.
write a function
scroll(str, n, m)
that modifies by str "rotating" it M steps.

If you can't do that, it's no point in trying to get that working on an image - it will just be much harder to figure out what's going on, because you won't be bale to immediately spot what's going wrong. Once you can do that, just change the scroll to take pixels (ints) instead of chars, or rows of pixels instead of chars for the vertical scroll, and you have your function ready to go.

--
Mats

**ICool** · 10-15-2007

IS something like this adequate for image scrolling procedure :

Code:

Image_horiscroller(INTEGER image_olddata[EP100_LIB_MAX_X][EP100_LIB_MAX_Y], INTEGER
width, INTEGER height, INTEGER horiscroll)
INTEGER * image_data[EP100_LIB_MAX_X][ EP100_LIB_MAX_Y]
INTEGER i, j
FOR (i <1
TO i<= width) DO
FOR (j <1
TO j<=height) DO
IF ((i + horiscroll)> width) THEN
image_data * [i+horiscroll100]
<image_
olddata[i]
ELSE IF ((i + horiscroll)<0 THEN
image_data * [i+horiscroll+100] <image_
olddata[i]
ELSE
image_data * [i+horiscroll] <image_
olddata[i]
ENDIF
ENDIF
ENDIF
END_Image_horiscroller
Image_vertiscroller(INTEGER image_olddata[EP100_LIB_MAX_X][EP100_LIB_MAX_Y], INTEGER
width, INTEGER height, INTEGER vertiscroll)
INTEGER image_data * [EP100_LIB_MAX_X][ EP100_LIB_MAX_Y]
INTEGER i, j
FOR (i <1
TO i<= height) DO
FOR (j <1
TO j<=width) DO
IF ((i + vertiscroll)> height) THEN
image_data * [i+vertiscroll100]
<image_
olddata[i]
ELSE IF ((i + vertiscroll)<0 THEN
image_data * [i+vertiscroll+100] <image_
olddata[i]
ELSE
image_data * [i+vertiscroll] <image_
olddata[i]
ENDIF
ENDIF
ENDIF
END_Image_vertiscroller