You can zoom an image with BiDisp control programmatically. You can use the BZoomStep or ZoomArea functions or methods.
[C++]
#include “BiDisp.h”
void CMyView::ZoomStep()
{
// 1. parameter (HWND): Window handle to display image
// 2. parameter (LPPOINT): Coordinates of the mouse pointer
// 3. parameter (ZOOMFLAG): Determines the operation of zoom.
// 4. parameter (LPZOOMSTRUCT): Zoom structure
// 5. parameter (DISPLAYSTRUCT): Display information structure
BZoomStep(m_hWnd, &rScale, zoomflg, &m_zm, &sDisplay);
DispZoom();
}
void CMyView::DispZoom()
{
CopyRect(&rScale, &m_zm.rScaleOut);
SetRect(&sDisplay.rOrigo, 0, 0, 0, 0);
sDisplay.rOrigo.left = m_zm.pOrigoOut.x;
sDisplay.rOrigo.top = m_zm.pOrigoOut.y;
if(hDib)
{
DisplayDIBStart(m_hWnd, hDib, &sDisplay.rOrigo,
&rScale, wDisplayMode, &sDisplay);
}
}
[VB]
Private Sub ZoomImage()
Dim iLeft As Long
Dim iTop As Long
Dim iRight As Long
Dim iBottom As Long
iLeft = 10
iTop = 10
iRight = 30
iBottom = 30
‘ parameters: Zooming rectnagle coordinates
BiDisp.ZoomArea (iLeft, iTop, iRight, iBottom)
End Sub
[C#]
private void ZoomImage()
{
int iLeft, iTop, iBottom, iRight;
iLeft = iTop = 10;
iRight = iBottom = 30;
// parameters: Zooming rectnagle coordinates
BiDisp.ZoomArea(iLeft, iTop, iRight, iBottom);
}