下面阴影处理中// GetRValue(oldcolor) * alpha / 1;改成/255,怎么与/1没什么变化?????

[mirroatl199]

/*========================================================================
	说明:	在指定的矩形区域内绘制阴影.	
==========================================================================*/
void DrawShadow(CDC *pDC, CRect rect)
{
	COLORREF oldcolor = RGB(255, 255, 255);
	BYTE newValR, newValG, newValB;
	BYTE AlphaArray[] = {140, 170, 212, 240};
	BYTE AlphaArray2[] = {170, 205, 220, 240, 240, 250, 255};
	
	// 底部的阴影 -----------------------------------------
	int i, j;
	for (j = 0; j < 4; j++)
	{
		for (i = 6; i <= rect.right - 5; i++)
		{
			oldcolor = pDC->GetPixel(i, rect.bottom - (4 - j));
			newValR = GetRValue(oldcolor) * AlphaArray[j] / 255;  
			newValG = GetGValue(oldcolor) * AlphaArray[j] / 255;  
			newValB = GetBValue(oldcolor) * AlphaArray[j] / 255;  
			pDC->SetPixel(i, rect.bottom - (4 - j), RGB(newValR, newValG, newValB));
		}
	}
	
	// 右边的阴影 -----------------------------------------
	for (i = 0; i < 4; i++)
	{
		for (j = 6; j <= rect.bottom - 5; j++)
		{
			oldcolor = pDC->GetPixel(rect.right - (4 - i), j);
			newValR = GetRValue(oldcolor) * AlphaArray[i] / 255;  
			newValG = GetGValue(oldcolor) * AlphaArray[i] / 255;  
			newValB = GetBValue(oldcolor) * AlphaArray[i] / 255;  
			pDC->SetPixel(rect.right - (4 - i), j, RGB(newValR, newValG, newValB));
		}
	}
	
	// 其他部位的阴影 --------------------------------------
	for (i = 0; i < 4; i++)
	{
		for (j = 0; j < 4; j++)
		{
			if ((i + j) > 6) break;
			BYTE alpha = AlphaArray2[i + j];
			oldcolor = pDC->GetPixel(rect.right - 4 + i, rect.bottom - 4 + j);
			newValR = GetRValue(oldcolor) * alpha / 1;  //改成/255,怎么与/1没什么变化?????
			newValG = GetGValue(oldcolor) * alpha / 1;  
			newValB = GetBValue(oldcolor) * alpha / 1;  
			pDC->SetPixel(rect.right - 4 + i, rect.bottom - 4 + j, RGB(newValR, newValG, newValB));
			
			oldcolor = pDC->GetPixel(rect.right - 4 + i, rect.top + 5 - j);
			newValR = GetRValue(oldcolor) * alpha / 1;  
			newValG = GetGValue(oldcolor) * alpha / 1;  
			newValB = GetBValue(oldcolor) * alpha / 1;  
			pDC->SetPixel(rect.right - 4 + i, rect.top + 5 - j, RGB(newValR, newValG, newValB));
			
			oldcolor = pDC->GetPixel(rect.left - i + 5, rect.bottom - 4 + j);
			newValR = GetRValue(oldcolor) * alpha / 1;  
			newValG = GetGValue(oldcolor) * alpha / 1;  
			newValB = GetBValue(oldcolor) * alpha / 1;  
			pDC->SetPixel(rect.left - i + 5, rect.bottom - 4 + j, RGB(newValR, newValG, newValB));
		}
	}
}

[jimette]

AlphaArray[j] / 255; 是一个100% 到 0%之间的小数 你确定没变化！

[fengbingchun]

二值图？？？？

[mirroatl199]

真没有 要不发程序给你?

引用 1 楼 sha_jinhao 的回复:

AlphaArray[j] / 255; 是一个100% 到 0%之间的小数 你确定没变化！

[编程小白_大场]

呵呵，来学习一下，还没有做过这个，呵呵。