求解此类vc控件 如图 （急）

[www18665346]

颜色渐变的色带 上面可以多点选择
急用 谢谢各位！！！

[schlafenhamster]

参考：

	case WM_PAINT: /* Divide client width into equal-sized parts, one per palette                
					* entry, and re-calculate client width so that it will display                
					* exactly as many vertical bars as there are palette entries. */
       GetClientRect(hWnd,(LPRECT) &rClientRect);
       nSizeX = (rClientRect.right - rClientRect.left);
       nSizeX = (nSizeX/iNumColors) * iNumColors;
       nSizeY = rClientRect.bottom - rClientRect.top;
       GetWindowRect(hWnd,(LPRECT) &rClientRect);
       /* Adjust window width so that it can display exactly                
		* as many vertical bars( of equal width) as there are palette                
		* colors.                */ 
		SetWindowPos( hWnd,(HWND)NULL, 0, 0, nSizeX + 2*nXBorder, rClientRect.bottom - rClientRect.top,
				SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);
        hDC = BeginPaint(hWnd, &ps);
        /* Select the palette into the window device context and 
	     make the Palette Manager map the logical palette to the
	   system palette (realize it). */
		SelectPalette (hDC,(HPALETTE)hPal, 1);
//could not used !  
//n=RealizePalette (hDC);//=0 ??
		/* Calculate width of each color bar to be displayed */
		nIncr = nSizeX / iNumColors;
		/* Paint the individual bars separately on the app. window */
		for (nStart = iLoop = 0; iLoop < iNumColors; iLoop++)
		{/* Since this app. uses a logical palette, use the
            * PALETTEINDEX macro to specify the palette entry
            * index instead of using an explicit RGB value.	*/
			hBrush = CreateSolidBrush (PALETTEINDEX (iLoop));
			dwPal[iLoop] = GetNearestColor (hDC, PALETTEINDEX (iLoop) );
			hOldBrush    = (HBRUSH)SelectObject (hDC,hBrush) ; 
			PatBlt (hDC, nStart, 0, nIncr, nSizeY, PATCOPY);
			nStart       += nIncr;
			SelectObject (hDC, hOldBrush); 
			DeleteObject (hBrush) ;
		}
		wsprintf (szTitlebuf, "MyPal Colors= %d", iNumColors);
		SetWindowText (hWnd, (LPSTR)szTitlebuf); 
		EndPaint(hWnd,&ps);
		break ;

[写不动代码的人]

可以用GDI+实现

[www18665346]

其实我还是不懂.....求详细

[www18665346]

[Quote=引用 1 楼 的回复:]
参考：

C/C++ code

case WM_PAINT: /* Divide client width into equal-sized parts, one per palette
* entry, and re-calculate client width so that it will displ……
[/Quote]
没有直接使用的控件吗？

[schlafenhamster]

就是用不同的颜色绘颜色条

[ljmj3256]

那个应该是贴的图吧，然后可以点击获取鼠标单击处的颜色

[MFCJCK]

[Quote=引用 6 楼 的回复:]

那个应该是贴的图吧，然后可以点击获取鼠标单击处的颜色
[/Quote]

补充一下，这个就是自绘的控件。

[dog357]

绘制渐变色

BOOL CMyButton::DrawGraden(HDC hdc, CONST RECT *pRect, CONST DWORD *cl, int Num, DWORD dwMode)
{
	int Width;
	int Height;
	TRIVERTEX *pvert;
	GRADIENT_RECT    *pgRect;

	if (cl == NULL || Num < 1 || pRect == NULL || dwMode == GRADIENT_FILL_TRIANGLE)
	{
		::SetLastError(ERROR_INVALID_PARAMETER);
		return TRUE;
	}

	if (Num == 1)
	{
		HBRUSH hBrush = CreateSolidBrush(cl[0]);
		SelectObject(hdc, hBrush);
		FillRect(hdc, pRect, hBrush);
		DeleteObject(hBrush);
		return TRUE;
	}

	pvert = new TRIVERTEX[Num * 2 - 2];
	pgRect = new GRADIENT_RECT[Num];

	Width = pRect->right - pRect->left;
	Height = pRect->bottom - pRect->top;
	for (int i = 0; i < Num - 1; i++)
	{
		if (dwMode == GRADIENT_FILL_RECT_V)
		{
			pvert[i * 2].x = pRect->left;
			pvert[i * 2].y = pRect->top + Height / (Num - 1) * i;

			pvert[i * 2 + 1].x = pRect->right;
			pvert[i * 2 + 1].y = pRect->top + Height / (Num - 1) * (i + 1);
		}
		else if (dwMode == GRADIENT_FILL_RECT_H)
		{
			pvert[i * 2].x = pRect->left + Width / (Num - 1) * i;
			pvert[i * 2].y = pRect->top;

			pvert[i * 2 + 1].x = pRect->left + Width / (Num - 1) * (i + 1);
			pvert[i * 2 + 1].y = pRect->bottom;
		}

		pvert[i * 2] .Red    = (WORD)GetRValue((cl[i])) << 8;
		pvert[i * 2] .Green  = (WORD)GetGValue((cl[i])) << 8;
		pvert[i * 2] .Blue   = (WORD)GetBValue((cl[i])) << 8;
		pvert[i * 2] .Alpha  = 0x0000;

		pvert[i * 2 + 1] .Red    = (WORD)GetRValue((cl[i + 1])) << 8;
		pvert[i * 2 + 1] .Green  = (WORD)GetGValue((cl[i + 1])) << 8;
		pvert[i * 2 + 1] .Blue   = (WORD)GetBValue((cl[i + 1])) << 8;
		pvert[i * 2 + 1] .Alpha  = 0x0000;

		pgRect[i].UpperLeft  = i * 2;
		pgRect[i].LowerRight = i * 2 + 1;
	}

	BOOL bRet = ::GradientFill(hdc, pvert, Num * 2, pgRect, Num - 1, dwMode);

	delete []pvert;
	delete []pgRect;

	return bRet;
}

DrawGraden(dc.GetSafeHdc(), &CRect(rt.left + 1,rt.top + 1, rt.right - 1, rt.bottom), cl, 3, GRADIENT_FILL_RECT_V);		//绘制渐变色

[schlafenhamster]

http://www.zhaodll.com/ocx/m/41070.html

[wocow3]

矩形渐变GDI和容易就能实现，你这个只需要划分几个矩形块多次调用GradientFill拼起来即可

[www18665346]

[Quote=引用楼主 的回复:]
颜色渐变的色带 上面可以多点选择
急用 谢谢各位！！！
[/Quote]
你的代码从哪来的？

[gz_qmc]

自己写个控件不就得了