#include <windows.h>
#include <math.h>
#include <iostream.h>
void MyPaint(HWND);
int Nxt(float);
int Nyt(float);
float f(float);
float A(float);
float B(float);
float f1(float);
float f2(float);
float f3(float);
float f4(float);
void DrawGraph (HDC, float(*)(float), float x0, float xn, int N,float px1, float py1, float px2, float py2);
float Integral(float(*)(float),float,float);
int Nxmin, Nymin, Nxmax, Nymax,k;
float Xmin, Ymin, Xmax, Ymax;
float T=10;
const int N=100;

/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
/* Make the class name into a global variable */
char szClassName = "Windows App";
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default color as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"Proga Fidan", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
1024, /* The programs width */
768, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nFunsterStil);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 500))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}

/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
case WM_PAINT:
MyPaint(hwnd);
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}

return 0;
}
//==================================================================================
int Nxt(float xt)
{
return (xt-Xmin)/(Xmax-Xmin)*(Nxmax-Nxmin)+Nxmin;
}
int Nyt(float yt)
{
return (yt-Ymin)/(Ymax-Ymin)*(Nymin-Nymax)+Nymax;
}
//==================================================================================
float f(float x)
{
float y;
if ((0<=x)&&(x<T/4)) y=1;
if ((T/4<=x)&&(x<3*T/4)) y=-4*x/T+2;
if ((3*T/4<=x)&&(x<=T)) y=-1;
return y;
}
//==================================================================================

void MyPaint (HWND hwnd)
{
PAINTSTRUCT ps;
HDC hdc;
hdc=BeginPaint(hwnd, &ps); /* N x1 y1 x2 y2 */
DrawGraph(hdc, f, 0.0,10.0, 1000, 10, 30, 310, 230);
DrawGraph(hdc, f1, 0.0,10.0, 1000, 350, 30, 650, 230);
DrawGraph(hdc, f2, 0.0,10.0, 1000,