在Windows窗体上使用VB6旋转ImageBox,可以通过以下步骤实现:
Private Const TIMER_ID As Long = 1
Private Const TIMER_INTERVAL As Long = 50
Private Const ROTATION_STEP As Single = 1.0
Private rotationAngle As Single
Private rotationTimer As Long
hDC = GetDC(0)
hMemDC = CreateCompatibleDC(hDC)
cx = GetDeviceCaps(hDC, HORZRES)
cy = GetDeviceCaps(hDC, VERTRES)
cxRot = cx * 2
cyRot = cy * 2
hRotatedBmp = CreateCompatibleBitmap(hDC, cxRot, cyRot)
hOldBmp = SelectObject(hMemDC, hRotatedBmp)
hRotatedDC = CreateCompatibleDC(hDC)
hRotatedBmpOld = SelectObject(hRotatedDC, hRotatedBmp)
BitBlt hRotatedDC, 0, 0, cxRot, cyRot, hMemDC, 0, 0, SRCCOPY
SetStretchBltMode hRotatedDC, HALFTONE
SetViewportOrgEx hRotatedDC, cx, cy, 0
SetGraphicsMode hRotatedDC, GM_ADVANCED
Dim xForm As XFORM
xForm.eM11 = Cos(angle * 3.14159 / 180)
xForm.eM12 = Sin(angle * 3.14159 / 180)
xForm.eM21 = -Sin(angle * 3.14159 / 180)
xForm.eM22 = Cos(angle * 3.14159 / 180)
xForm.eDx = 0
xForm.eDy = 0
SetWorldTransform hRotatedDC, xForm
BitBlt hMemDC, 0, 0, cx, cy, hRotatedDC, 0, 0, SRCCOPY
SelectObject hRotatedDC, hRotatedBmpOld
DeleteDC hRotatedDC
SelectObject hMemDC, hOldBmp
DeleteDC hMemDC
ReleaseDC 0, hDC
ImageRotate = hRotatedBmp
End Function
通过以上步骤,你可以在VB6的Windows窗体上实现旋转ImageBox的效果。请注意,以上代码仅适用于VB6,并且仅提供了基本的旋转功能。如果需要更复杂的图像处理功能,建议使用其他专业的图像处理库或工具。
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