sinewave

[ciencia]

I need help as soon as possible on making a sine wave I'm trying to do the equation y = Acos(2 (pi)/B x - 2(pi)/B P) amplitude A, period B, and phase shift P. It is not working out too well so can anyone help me refine this?

Code


#include <math.h>
#include <stdio.h>
#include <windows.h>

#include "resource.h "

// your path for this include may vary
#include "GraphicsFramew ork.h"

// Global variable to store the graphics framwork object
GraphicsFramewo rk* PGraphics;

HWND HOutput = 0; // handle to the output control
HWND HDialog = 0;


void DrawStuff()
{
COLORREF green = RGB(0, 255, 0); // green color to draw with
COLORREF purple = RGB(255, 0, 255); // purple color to draw with

char str[32]; // string to store user input
double amplitude;
double period;
double phaseAngle;
const double PI = 3.1415927; // constant Pi
RECT rect; // rectangle for the output window
int xMin, xMax, wdRect; // min & max x rectangle coords
int y, x;

// clear the scene and add an axis
PGraphics->ClearScene(RGB (0, 0, 0));
PGraphics->AddAxis(RGB(15 0, 150, 150), 10);

// get the rectangle info for this window
GetClientRect(H Output, &rect);
wdRect = rect.right - rect.left;
xMin = -wdRect / 2;
xMax = wdRect / 2;

// get the user input from the edit boxes and
// convert string input to double
GetDlgItemText( HDialog, IDC_EDIT_AMPLIT UDE, str, 32);
amplitude = atof(str);
GetDlgItemText( HDialog, IDC_EDIT_PERIOD , str, 32);
period = atof(str);
GetDlgItemText( HDialog, IDC_EDIT_PHASEA NGLE, str, 32);
phaseAngle = atof(str);

// Add the for loop here, that creates the points (x,y)
//one pixel at a time and then adds the points via the
// command PGraphics->AddPoint(x,y,g reen)
y = amplitude cos(2(3.14)/period) x - (2(3.14)/period) phaseAngle);



// draw the points
PGraphics->Draw();
}

/*
DialogProc
this is the window event handler for the main dialog
*/
BOOL CALLBACK DialogProc (HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
switch(message)
{
case WM_INITDIALOG:
// dialog is initializing - store the picture box handle in a global variable for later
HOutput = GetDlgItem(hwnd , IDC_PICTURE_OUT PUT);

// instantiate and initialize our graphics framework object
PGraphics = new GraphicsFramewo rk(HOutput);

break;

case WM_COMMAND:
switch(LOWORD(w Param))
{
case IDC_BTN_DRAW:
// draw button was pressed
DrawStuff();
break;
case IDC_BTN_CLEAR:
// clear button was pressed so clear the scene and draw the empty scene
PGraphics->ClearScene(RGB (0, 0, 0));
PGraphics->Draw();
break;
case IDCANCEL:
// user is quitting so release the GraphicsFramewo rk object and quit
delete PGraphics;
PostQuitMessage (0);
break;
}

}
return FALSE;
}

// this is the main function that starts the application
int WINAPI WinMain(HINSTAN CE hInst, HINSTANCE hPrevInst, char * cmdParam, int cmdShow)
{
// create the main window
// store its handle in a global if needed
HDialog = CreateDialog (GetModuleHandl e(NULL),
MAKEINTRESOURCE (IDD_DIALOG1),
0,
DialogProc);

// make the dialog visible
ShowWindow(HDia log, SW_SHOW);

// standard windows message loop
MSG msg;
int status;
while ((status = GetMessage (&msg, 0, 0, 0)) != 0)
{
if (status == -1)
return -1;
// avoid processing messages for the dialog
if (!IsDialogMessa ge (HDialog, & msg))
{
TranslateMessag e ( & msg );
DispatchMessage ( & msg );
}
}

return (int)(msg.wPara m);
}

[newb16]

You wrote ( or more likely copypasted ) the whole windows application source and screwed entirely the very line of ( you own ) calculation with phase, amplitude and stuff. You can't just leave blanks for multiplications like in formulas, use that starry stuff for it. And you know, your compiler must have written something like 'error: line xxx: wrong_stuff_goe s_here' - it's useful to tell us about them to let people not guess.