I such at programming pls help (c++)

Hi.
I'm new at programming and I need some help with a task assigned for me.
I've been asked to Make a C++ program that can rotate an image q degrees around the point (x,y).

So far I have modified a program a friend of mine made that inputs the bitmap image and outputs a the new image, so that it works for what I want it to do.

I'm having trouble figuring out how to make the algorithm that rotates the image and how to code it. Another problem i'm having is that i'm quite new to programming, I can read and understand code but I have a really hard time just writing code.

Here's what I have made so far:
http://pastebin.com/VrxEYZMv
(The function rotate is the one i'm trying to make)

And by such I mean suck.

convert -rotate [number] image.type final_image.type

Rotating a 2D picture is easy. For each point of the output, you compute the image of its coordinates through rotation by θ under translation by (-x, -y). Then, the value of that point is in the input at those transformed coordinates.

But right now the output image = the input image

>>4

and don't forget to blend the subpixel position results.

Okay, so i've now made these two variables.

long NewWidth = width * cos(radians) - height * sin(radians);

long NewHeight = height * sin(radians) + width * cos(radians);

But to rotate this using a rotation matrix i need to transform the pixel position by subtracting the rotation point.
But i don't really know hot to do this.

>>7

but you have it all there, just replace widht by x and height by y.

>>8
Hmm, tried putting this in as my output height and width, but the bitmap i got was corrupt

#define  char char

WHOA MAN

sepples a shit

>>9

why did you do that?

a meant the formula is the same for calculating the resulting position for each pixel. Also make sure the results are integers.

of course this formula needs to be updated with the rotation center (as previously proposed), as currently it is the top left corner of the image.

Read your linear algebra textbooks.