Graphics

<br />
for( int i=0 ; i<200 ; ++i)<br />
{<br />
theta = 2+Math::PI*float(i)/10;<br />
r = Math::Sqrt(theta);<br />
x=r*Math::Cos(theta)+400;<br />
y=r*Math::Sin(theta)+400;<br />
}<br />

sarah_malik wrote:

I need more algorithms that would to the same.

The Grand Negus wrote:

the number of things you can draw with formulas is seriously limited.

sarah_malik wrote:

but I just need algorithms that would draw such things.

The Grand Negus wrote:

do you want to (1) write a program to produce art of a particular kind, or do you want to (2) use someone else's program to produce these works?

The Grand Negus wrote:

I need to know what language(s) you know, your level of expertise, and how much time you're willing to spend on the thing.

sarah_malik wrote:

I'm trying to write a program that produces art

The Grand Negus wrote:

The source code (in Plain English) is also on the site.

The Grand Negus wrote:

How 'bout them Mandelbrots?

void mandel(int xpt, int ypt)<br />
{<br />
	long double x=0;<br />
	long double y=0;		//converting from pixels to points<br />
	long double xnew=0;<br />
	long double ynew=0;<br />
<br />
	for(int k=0;k<=initer;k++)  // Each pixel loop<br />
	{<br />
	//The Mandelbrot Function Z=Z*Z+c into x and y parts<br />
<br />
	xnew=x*x-y*y + xpt*pixcorx+Minx;<br />
	ynew=2*x*y   + Maxy-ypt*pixcory;<br />
	x=xnew;<br />
	y=ynew;<br />
	if ( (x*x+y*y)>4 ) break;  // Break condition<br />
	}                      // End each pixel loop<br />
<br />
	int color = k;<br />
	if (color>15) color=color%15;<br />
	if (k>=initer)<br />
	putpixel(xpt,ypt,0);<br />
	else<br />
	putpixel(xpt,ypt,color);<br />
<br />
	newcolor=color;<br />
}

Pseudocode for vertical flip:
 
Set FirstRowPtr to first row pixel data
Set LastRowPointer to last row pixel data
loop (imageheight / 2) times
{
   swap FirstRowPtr pixel data with LastRowPointer pixel data
   Set FirstRowPtr to next row pixel data
   Set LastRowPointer to previous row pixel data
}

Rilhas wrote:

I once made an application to wrap the real-time video feed from a web cam onto a 3D virtual object in the OpenGL world. Do you want to do something like that?

int nScreenWidth = ::GetSystemMetrics(SM_CXSCREEN);
int nScreenHeight = ::GetSystemMetrics(SM_CYSCREEN);

HDC Source = ::GetDC(0);
HDC Destination = ::CreateCompatibleDC(Source);
HBITMAP hCaptureBitmap = ::CreateCompatibleBitmap(Source, nScreenWidth, nScreenHeight);
HGDIOBJ hOldBm = ::SelectObject(Destination, hCaptureBitmap);
::BitBlt(Destination,0,0,nScreenWidth,nScreenHeight, Source, 0, 0, SRCCOPY);
::SelectObject(Destination, hOldBm);

BITMAPINFO bmi;
memset(&bmi, 0, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

// Fill the BITMAPINFO struct with info from the DDB
::GetDIBits(Source, hCaptureBitmap, 0, nScreenHeight, NULL, &bmi, DIB_RGB_COLORS);

// Normally, you'd want to reallocate the BITMAPINFO struct so there's enough room for
// any color table or bitfield entries here!!

// *optional* Adjust the BITMAPINFO struct to the desired DIB format here
bmi.bmiHeader.biCompression = BI_RGB;

BYTE *pPixelBytes = new BYTE[bmi.bmiHeader.biSizeImage];

// Get the DIB pixel bytes from the DDB
::GetDIBits(Source, hCaptureBitmap, 0, nScreenHeight, pPixelBytes, &bmi, DIB_RGB_COLORS);


// Do something with the DIB here


::ReleaseDC(0, Source);
::DeleteDC(Destination);
::DeleteObject(hCaptureBitmap);
delete[] pPixelBytes;