BOOL CChildView::EncodeCrop(LPPOINT lptStart, LPPOINT lptEnd, LPRECT lpRect)
{
int x, y, c1, c2, c;
double slope;
c1 = EncodePoint(lptStart, lpRect);
c2 = EncodePoint(lptEnd , lpRect);
if (c1 & c2)
return FALSE;
if (lptStart->x == lptEnd->x)
{
if (c1 & BOTTOM) lptStart->y = lpRect->bottom;
else if (c1 & TOP) lptStart->y = lpRect->top;
if (c2 & BOTTOM) lptEnd->y = lpRect->bottom;
else if (c2 & TOP) lptEnd->y = lpRect->top;
return TRUE;
}
slope = (double)(lptEnd->y - lptStart->y) / (double)(lptEnd->x - lptStart->x);
while (c1 | c2)
{
if (c1)
c = c1;
else
c = c2;
if (c & LEFT)
{
x = lpRect->left;
y = (int)(lptStart->y + slope * (lpRect->left - lptStart->x));
}
else if (c & TOP)
{
y = lpRect->top;
x = (int)(lptStart->x + (lpRect->top - lptStart->y) / slope);
}
else if (c & RIGHT)
{
x = lpRect->right;
y = (int)(lptStart->y + slope * (lpRect->right - lptStart->x));
}
else if (c & BOTTOM)
{
y = lpRect->bottom;
x = (int)(lptStart->x + (lpRect->bottom - lptStart->y) / slope);
}
if (c == c1)
{
lptStart->x = x;
lptStart->y = y;
c1 = EncodePoint(lptStart, lpRect);
}
else
{
lptEnd->x = x;
lptEnd->y = y;
c2 = EncodePoint(lptEnd, lpRect);
}
}
return TRUE;
}
void ECP::EncodePoint(byte *encodedPoint, const Point &P, bool compressed) const
{
ArraySink sink(encodedPoint, EncodedPointSize(compressed));
EncodePoint(sink, P, compressed);
assert(sink.TotalPutLength() == EncodedPointSize(compressed));
}
void EC2N::DEREncodePoint(BufferedTransformation &bt, const Point &P, bool compressed) const
{
SecByteBlock str(EncodedPointSize(compressed));
EncodePoint(str, P, compressed);
DEREncodeOctetString(bt, str);
}
void EC2N::EncodePoint(byte *encodedPoint, const Point &P, bool compressed) const
{
ArraySink sink(encodedPoint, EncodedPointSize(compressed));
EncodePoint(sink, P, compressed);
CRYPTOPP_ASSERT(sink.TotalPutLength() == EncodedPointSize(compressed));
}
