/****************************************************************************
PROGRAM: Select.c
PURPOSE: Contains library routines for selecting a region
FUNCTIONS:
StartSelection(HWND, POINT, LPRECT, int) - begin selection area
UpdateSelection(HWND, POINT, LPRECT, int) - update selection area
EndSelection(POINT, LPRECT) - end selection area
ClearSelection(HWND, LPRECT, int) - clear selection area
*******************************************************************************/
#include "windows.h"
#include "select.h"
extern int xco, yco, xco_sto, yco_sto;
extern int dHeight, dWidth;
extern unsigned char rvenster_xrb, rvenster_ylo;
/****************************************************************************
FUNCTION: StartSelection(HWND, POINT, LPRECT, int)
PURPOSE: Begin selection of region
****************************************************************************/
void StartSelection(HWND hWnd, POINT ptCurrent, LPRECT lpSelectRect, int fFlags)
{
if (lpSelectRect->left != lpSelectRect->right || 
lpSelectRect->top != lpSelectRect->bottom)
ClearSelection(hWnd, lpSelectRect, fFlags);
lpSelectRect->right = ptCurrent.x;
lpSelectRect->bottom = ptCurrent.y;
xco = ptCurrent.x / dWidth + 1;
yco = ptCurrent.y / dHeight + 1;
if (xco > rvenster_xrb)
xco = rvenster_xrb;
if (yco > rvenster_ylo)
yco = rvenster_ylo;
if (xco <1)
xco = 1;
if (yco <1)
yco = 1;
/* If you are extending the box, then invert the current rectangle */
if ((fFlags & SL_SPECIAL) == SL_EXTEND)
ClearSelection(hWnd, lpSelectRect, fFlags);
/* Otherwise, set origin to current location */
else {
lpSelectRect->left = ptCurrent.x;
lpSelectRect->top = ptCurrent.y;
}
SetCapture(hWnd);
}
/****************************************************************************
FUNCTION: UpdateSelection(HWND, POINT, LPRECT, int) - update selection area
PURPOSE: Update selection
****************************************************************************/
void UpdateSelection(HWND hWnd, POINT ptCurrent, LPRECT lpSelectRect, int fFlags)
{
HDC hDC;
short OldROP;
hDC = GetDC(hWnd);
switch (fFlags & SL_TYPE) {
case SL_BOX:
OldROP = SetROP2(hDC, R2_NOTXORPEN);
MoveTo(hDC, lpSelectRect->left, lpSelectRect->top);
LineTo(hDC, lpSelectRect->right, lpSelectRect->top);
LineTo(hDC, lpSelectRect->right, lpSelectRect->bottom);
LineTo(hDC, lpSelectRect->left, lpSelectRect->bottom);
LineTo(hDC, lpSelectRect->left, lpSelectRect->top);
LineTo(hDC, ptCurrent.x, lpSelectRect->top);
LineTo(hDC, ptCurrent.x, ptCurrent.y);
LineTo(hDC, lpSelectRect->left, ptCurrent.y);
LineTo(hDC, lpSelectRect->left, lpSelectRect->top);
SetROP2(hDC, OldROP);
break;
case SL_BLOCK:
PatBlt(hDC,
lpSelectRect->left,
lpSelectRect->bottom,
lpSelectRect->right - lpSelectRect->left,
ptCurrent.y - lpSelectRect->bottom,
DSTINVERT);
PatBlt(hDC,
lpSelectRect->right,
lpSelectRect->top,
ptCurrent.x - lpSelectRect->right,
ptCurrent.y - lpSelectRect->top,
DSTINVERT);
break;
}
lpSelectRect->right = ptCurrent.x;
lpSelectRect->bottom = ptCurrent.y;
xco_sto = ptCurrent.x / dWidth + 1;
yco_sto = ptCurrent.y / dHeight + 1;
if (xco_sto >rvenster_xrb)
xco_sto = rvenster_xrb;
if (yco_sto >rvenster_ylo)
yco_sto = rvenster_ylo;
if (xco_sto <1)
xco_sto = 1;
if (yco_sto <1)
yco_sto = 1;
ReleaseDC(hWnd, hDC);
}
/****************************************************************************
FUNCTION: EndSelection(POINT, LPRECT)
PURPOSE: End selection of region, release capture of mouse movement
***************************************************************************/
void EndSelection(POINT ptCurrent, LPRECT lpSelectRect)
{
lpSelectRect->right = ptCurrent.x;
lpSelectRect->bottom = ptCurrent.y;
ReleaseCapture();
}
/****************************************************************************
FUNCTION: ClearSelection(HWND, LPRECT, int) - clear selection area
PURPOSE: Clear the current selection
****************************************************************************/
void ClearSelection(HWND hWnd, LPRECT lpSelectRect,
int fFlags)
{
HDC hDC;
short OldROP;
hDC = GetDC(hWnd);
switch (fFlags & SL_TYPE) {
case SL_BOX:
OldROP = SetROP2(hDC, R2_NOTXORPEN);
MoveTo(hDC, lpSelectRect->left, lpSelectRect->top);
LineTo(hDC, lpSelectRect->right, lpSelectRect->top);
LineTo(hDC, lpSelectRect->right, lpSelectRect->bottom);
LineTo(hDC, lpSelectRect->left, lpSelectRect->bottom);
LineTo(hDC, lpSelectRect->left, lpSelectRect->top);
SetROP2(hDC, OldROP);
break;
case SL_BLOCK:
PatBlt(hDC,
lpSelectRect->left,
lpSelectRect->top,
lpSelectRect->right - lpSelectRect->left,
lpSelectRect->bottom - lpSelectRect->top,
DSTINVERT);
break;
}
ReleaseDC(hWnd, hDC);
}