C++ Schleife, GDI, wo liegt der Fehler?

[Thilo87]

Hallo,

verstehe einfach nicht, wo mein Fehler liegt? Ich möchte verschiedene Ellipsen zeichnen. Mit WAVEPOINTER::AddCurve fügt man einem Array eine Ellipse hinzu, die dann mit WAVEPOINTER::Draw in einer Schleife gezeichnet wird. Aber das funktioniert nicht?! Er zeichnet immer nur die allererste Ellipse.

//wavepointer.h

#include <Windows.h>
#include <GdiPlus.h>

class WAVEPOINTER{
private:
	INT32 iPosX;
	INT32 iPosY;
	INT32 iMidPointRadius; // Radius des Mittelpunktes

	INT32 iCurves;
	INT32 iRadius[100];
	Gdiplus::Color cLineColor[100];

public:
	WAVEPOINTER(INT32 iRadius, INT32 iPosX, INT32 iPosY, INT32 iMidPointRadius, Gdiplus::Color cLineColor);

	void AddCurve(INT32 iRadius, Gdiplus::Color cLineColor);
	void Draw(HDC hDC); 
};

// wavepointer.cpp
#include "stdafx.h"

WAVEPOINTER::WAVEPOINTER(INT32 iRadius, INT32 iPosX, INT32 iPosY, INT32 iMidPointRadius, Gdiplus::Color cLineColor){
	this->iRadius[0] = iRadius;
	this->iPosX = iPosX;
	this->iPosY = iPosY;
	this->cLineColor[0] = cLineColor;
	this->iMidPointRadius = iMidPointRadius;

	this->iCurves = 1;
};

void WAVEPOINTER::Draw(HDC hDC){
	Graphics	gGraphics(hDC);

	for (INT32 i = 0; i < iCurves; i++) {
		Pen			pPen(cLineColor[i]);
		SolidBrush	sbBrush(cLineColor[i]);

		// Außenlinie
		gGraphics.DrawEllipse(&pPen,iPosX,iPosY,iRadius[i],iRadius[i]);

		// Mittelpunkt
		gGraphics.FillEllipse(&sbBrush,(INT32) (iPosX + iRadius[i]/2 - iMidPointRadius/2), (INT32) (iPosY + iRadius[i]/2 - iMidPointRadius/2),iMidPointRadius,iMidPointRadius);
	}
};

void WAVEPOINTER::AddCurve(INT32 iRadius, Gdiplus::Color cLineColor){
	this->iRadius[iCurves] = iRadius;
	this->cLineColor[iCurves] = cLineColor;

	iCurves++;
};

// main.cpp
#pragma comment(lib, "gdiplus.lib")

#include "stdafx.h"
[b]WAVEPOINTER wpWavePointer(400,20,20,7,Color(0,0,255));[/b]

//---------------------------------------------------------------------------
HWND hWnd;
LPCTSTR ClsName = L"GDIFund";
LPCTSTR WindowCaption = L"GDI Fundamentals";
LRESULT CALLBACK WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
//---------------------------------------------------------------------------

INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow)
{
	GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR           gdiplusToken;  
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

    MSG         Msg;
    WNDCLASSEX  WndClsEx;

    WndClsEx.cbSize        = sizeof(WNDCLASSEX);
    WndClsEx.style         = CS_HREDRAW | CS_VREDRAW;
    WndClsEx.lpfnWndProc   = WndProc;
    WndClsEx.cbClsExtra    = NULL;
    WndClsEx.cbWndExtra    = NULL;
    WndClsEx.hInstance     = hInstance;
    WndClsEx.hIcon         = LoadIcon(hInstance, IDI_APPLICATION);
    WndClsEx.hCursor       = LoadCursor(NULL, IDC_ARROW);
    WndClsEx.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    WndClsEx.lpszMenuName  = NULL;
    WndClsEx.lpszClassName = ClsName;
    WndClsEx.hIconSm       = LoadIcon(hInstance, IDI_APPLICATION);

    RegisterClassEx(&WndClsEx);

    hWnd = CreateWindowEx(WS_EX_OVERLAPPEDWINDOW,
                          ClsName,
                          WindowCaption,
                          WS_OVERLAPPEDWINDOW,
                          100,
                          120,
                          640,
                          480,
                          NULL,
                          NULL,
                          hInstance,
                          NULL);

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

[b]wpWavePointer.AddCurve(100,Color(255,0,0));[/b]

    while( GetMessage(&Msg, NULL, 0, 0) )
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }

	GdiplusShutdown(gdiplusToken);

    return 0;
}

//---------------------------------------------------------------------------
LRESULT CALLBACK WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
	HDC hDC;
	PAINTSTRUCT ps;

    switch(Msg)
    {
    case WM_DESTROY:
        PostQuitMessage(WM_QUIT);
        break;
	case WM_PAINT:
		hDC = BeginPaint(hWnd, &ps);
		[b]wpWavePointer.Draw(hDC);[/b]
		EndPaint(hWnd,&ps);
		break;
    default:
        return DefWindowProc(hWnd, Msg, wParam, lParam);
    }
    return 0;
}

Danke,

Thilo

[Thilo87]

Irgendwie sind die Arrays wieder zurückgesetzt, wenn Draw() aufgerufen wird...

[Thilo87]

Oh oh ich habs. AddCurve muss natürlich vor ShowWindow(). Danke ^^