LBitmapRgn::SetRgnPolygon
#include "ltwrappr.h"
virtual L_INT LBitmapRgn::SetRgnPolygon(pPoints, uPoints, uFillMode=L_POLY_WINDING)
POINT * pPoints; |
/* pointer to an array of POINT structures */ |
L_UINT uPoints; |
/* number of points in the array */ |
L_UINT uFillMode; |
/* flag that indicates how to handle complex crossing lines */ |
Creates or updates the associated class object's bitmap region by adding a polygonal region.
Parameter |
Description |
|
pPoints |
Pointer to an array of POINT structures. The points in the array must be in the order in which the vertices of the polygon are connected. To create the line that closes the polygon, the last point in the array is connected to the first point of the array. |
|
uPoints |
The number of points in the array specified by the pPoints parameter. |
|
uFillMode |
Flag that indicates how to handle complex crossing lines. The following are valid values, which are illustrated below: |
|
|
Value |
Meaning |
|
L_POLY_WINDING |
[0] All pixels that are inside the resulting exterior lines are in the region. |
|
L_POLY_ALTERNATE |
[1] The region includes the area between odd-numbered and even-numbered polygon sides on each scan line. |
|
|
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
To update an existing region, you specify how the new region is to be combined with the existing one. For descriptions of the possibilities, refer to Creating a Bitmap Region.
Required DLLs and Libraries
LTDIS For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
Example
L_INT LBitmapRgn__SetRgnPolygonExample(HWND hWnd) { RGNXFORM XFormBtmp; // Structure for transforming display coordinates RECT rClientArea; // Client area of the current window L_INT nRet = 0; LBitmapRgn lBmpRgn ; LBitmapBase lBmpBase ; LBitmapBase lBmpMask ; HRGN hRgn ; POINT PolyPt[5]; // Array of points that defines the polygon POINT *pPolyPt = PolyPt; // Pointer to the array of points // Get the client area of the current window GetClientRect(hWnd,&rClientArea); // Load a bitmap nRet = lBmpBase.Load(TEXT("C:\\Program Files\\LEAD Technologies, Inc\\LEADTOOLS 15.0\\Images\\IMAGE1.CMP"), 32, ORDER_BGR); if (nRet == SUCCESS) { lBmpRgn.SetBitmap(&lBmpBase) ; L_UINT uCombineMode = lBmpRgn.GetRgnCombineMode() ; uCombineMode |= L_RGN_OR ; lBmpRgn.SetRgnCombineMode(uCombineMode) ; nRet =lBmpRgn.SetRgnColor(RGB(0,0,0)) ; if(nRet !=SUCCESS) return nRet; // create mask region from bitmap nRet = lBmpRgn.CreateMaskFromBitmapRgn(&lBmpMask, sizeof(lBmpMask)) ; if (nRet == SUCCESS) { // set region from mask bitmap lBmpRgn.SetRgnFromMask(lBmpMask) ; } else return nRet; // get the region transform used with region function lBmpRgn.GetRgnXForm(&XFormBtmp) ; /* Set RGNXFORM fields, assuming that the display rectangle is the same as the client area of the current window */ XFormBtmp.uViewPerspective = TOP_LEFT; XFormBtmp.nXScalarNum = lBmpBase.GetWidth(); XFormBtmp.nXScalarDen = rClientArea.right; XFormBtmp.nYScalarNum = lBmpBase.GetHeight() ; XFormBtmp.nYScalarDen = rClientArea.bottom; XFormBtmp.nXOffset = 0; XFormBtmp.nYOffset = 0; // set the region transform to be used in region functions nRet =lBmpRgn.SetRgnXForm(&XFormBtmp) ; if(nRet !=SUCCESS) return nRet; // Specify the vertices of the polygon (a 5-pointed star) pPolyPt[0].x = 0; pPolyPt[0].y = 0; pPolyPt[1].x = rClientArea.right / 3; pPolyPt[1].y = rClientArea.bottom / 2; pPolyPt[2].x = rClientArea.right / 3; pPolyPt[2].y = 0; pPolyPt[3].x = 0; pPolyPt[3].y = rClientArea.bottom / 3; pPolyPt[4].x = rClientArea.right / 2; pPolyPt[4].y = rClientArea.bottom / 3; // Create a polygonal region nRet =lBmpRgn.SetRgnPolygon( pPolyPt, 5, L_POLY_ALTERNATE); if(nRet !=SUCCESS) return nRet; // Save the first polygonal region hRgn = lBmpRgn.GetRgnHandle(); // Free the region nRet =lBmpRgn.Free(); if(nRet !=SUCCESS) return nRet; // Add the saved region to the new one nRet =lBmpRgn.SetRgnHandle(hRgn); if(nRet !=SUCCESS) return nRet; /* ... ... ... */ // Delete the HRGN object DeleteObject(hRgn); } return nRet; }