#include "l_bitmap.h"
L_LTDIS_API L_INT L_CurveToBezier(pCurve, pOutPointCount, OutPoint)
Converts a curve (defined by an array of points that the curve passes through) to an array of Bezier points. The resulting array can be used to with the Windows C APIs PolyBezier and PolyBezierTo.
Pointer to a CURVE structure that defines a curve.
Pointer to a variable to be updated with the number of Bezier control points.
Pointer to an array of POINT structures to be updated with the Bezier control points.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
This function is used to convert a standard curve to an array of Bezier control points. A LEAD standard curve (CURVE_STANDARD) is defined by the CURVE structure, and one of the fields is an array of POINT structures. The standard curve passes through all of the points in the array, and is continuous at each point. This function can be used to draw this curve by converting it to an array of Bezier points, and using the Windows C API PolyBezier (or PolyBezierTo) to draw the equivalent Bezier.
To use this function, declare a variable of type CURVE, and fill in the appropriate fields. For this function, all fields of the CURVE structure are required EXCEPT uFillMode, which is ignored. For more information, refer to the CURVE structure.
The OutPoint
must point to an array of POINT structures that is large enough to hold the Bezier control points. At most, the resulting array must hold (3n + 1) entries, where n is the number of points in the CURVE_STANDARD curve. If this function is called with OutPoint set to NULL, pOutPointCount
will be updated with the required number of entries in the OutPoint array.
Required DLLs and Libraries
Win32, x64, Linux.
This sample draws a smooth closed curve on hDC that goes through five points
L_INT CurveToBezierExample(HDC hDC)
{
L_INT nRet;
CURVE Curve;
POINT points[5];
L_INT nOutPointCount;
LPPOINT pOutPoints;
HPEN hPen, hPrevPen;
L_INT nPrevROP2;
//Define the points of the curve
points[0].x = 130;
points[0].y = 130;
points[1].x = 130;
points[1].y = 300;
points[2].x = 230;
points[2].y = 230;
points[3].x = 175;
points[3].y = 175;
points[4].x = 230;
points[4].y = 130;
Curve.uStructSize = sizeof(CURVE);
Curve.nType = CURVE_STANDARD;
Curve.nPointCount = 5;
Curve.pPoints = points;
Curve.uFillMode = L_POLY_WINDING; //This member is ignored
Curve.dTension = 0.5;
Curve.nClose = CURVE_CLOSE;
Curve.nReserved = 0;
//Determined the number of required points
nRet = L_CurveToBezier(&Curve, &nOutPointCount, NULL);
if (nRet != SUCCESS)
return nRet;
pOutPoints = (LPPOINT)malloc( sizeof(POINT) * nOutPointCount);
if (pOutPoints == NULL)
return FAILURE;
nRet = L_CurveToBezier(&Curve, &nOutPointCount, pOutPoints);
if (nRet != SUCCESS)
{
free(pOutPoints);
return nRet;
}
//Create a pen
hPen = CreatePen(PS_SOLID, 1,RGB(255,255,255));
hPrevPen = (HPEN)SelectObject(hDC, hPen);
nPrevROP2 = SetROP2(hDC, R2_XORPEN);
//Draw the curve that goes through the original five points
nRet = PolyBezier(hDC, pOutPoints, nOutPointCount);
//Restore the hDC
SetROP2(hDC, nPrevROP2);
SelectObject(hDC, hPrevPen);
DeleteObject(hPen);
free(pOutPoints);
return SUCCESS;
}
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