public void PineHLine(int xc, int yc, int xp1, int yp1, int xp2, int yp2,
int xh1, int yh1, int xh2)
{
if (doClipping && ClipLiangBarsky.Flags(xc, yc, clippingRectangle) != 0)
{
return;
}
byte[] covers = new byte[MAX_HALF_WIDTH * 2 + 4];
int index0 = 0;
int index1 = 0;
int x = xh1 << LineAA.SUBPIXEL_SHIFT;
int y = yh1 << LineAA.SUBPIXEL_SHIFT;
int w = SubPixelWidth;
DistanceInterpolator00 di = new DistanceInterpolator00(xc, yc, xp1, yp1, xp2, yp2, x, y);
x += LineAA.SUBPIXEL_SCALE / 2;
y += LineAA.SUBPIXEL_SCALE / 2;
int xh0 = xh1;
int dx = x - xc;
int dy = y - yc;
do
{
int d = (int)(AggMath.fast_sqrt(dx * dx + dy * dy));
covers[index1] = 0;
if (di.Distance1 <= 0 && di.Distance2 > 0 && d <= w)
{
covers[index1] = (byte)GetCover(d);
}
++index1;
dx += LineAA.SUBPIXEL_SCALE;
di.IncX();
}while (++xh1 <= xh2);
destImageSurface.BlendSolidHSpan(xh0, yh1, index1 - index0, Color, covers, index0);
}
public override void SemiDot(CompareFunction cmp, int xc1, int yc1, int xc2, int yc2)
{
if (doClipping && ClipLiangBarsky.Flags(xc1, yc1, clippingRectangle) != 0)
{
return;
}
int r = ((SubPixelWidth + LineAA.SUBPIXEL_MARK) >> LineAA.SUBPIXEL_SHIFT);
if (r < 1)
{
r = 1;
}
EllipseBresenhamInterpolator ei = new EllipseBresenhamInterpolator(r, r);
int dx = 0;
int dy = -r;
int dy0 = dy;
int dx0 = dx;
int x = xc1 >> LineAA.SUBPIXEL_SHIFT;
int y = yc1 >> LineAA.SUBPIXEL_SHIFT;
do
{
dx += ei.Dx;
dy += ei.Dy;
if (dy != dy0)
{
SemiDotHLine(cmp, xc1, yc1, xc2, yc2, x - dx0, y + dy0, x + dx0);
SemiDotHLine(cmp, xc1, yc1, xc2, yc2, x - dx0, y - dy0, x + dx0);
}
dx0 = dx;
dy0 = dy;
ei.Next();
}while (dy < 0);
SemiDotHLine(cmp, xc1, yc1, xc2, yc2, x - dx0, y + dy0, x + dx0);
}
public void MoveTo(int x1, int y1)
{
m_x1 = x1;
m_y1 = y1;
if (m_clipping)
{
m_f1 = ClipLiangBarsky.Flags(x1, y1, clipBox);
}
}
//--------------------------------------------------------------------
public void LineTo(int x2, int y2)
{
if (m_clipping)
{
int f2 = ClipLiangBarsky.Flags(x2, y2, clipBox);
if ((m_f1 & 10) == (f2 & 10) && (m_f1 & 10) != 0)
{
// Invisible by Y
m_x1 = x2;
m_y1 = y2;
m_f1 = f2;
return;
}
int x1 = m_x1;
int y1 = m_y1;
int f1 = m_f1;
int y3, y4;
int f3, f4;
switch (((f1 & 5) << 1) | (f2 & 5))
{
case 0: // Visible by X
LineClipY(x1, y1, x2, y2, f1, f2);
break;
case 1: // x2 > clip.x2
y3 = y1 + MulDiv(clipBox.Right - x1, y2 - y1, x2 - x1);
f3 = ClipLiangBarsky.GetFlagsY(y3, clipBox);
LineClipY(x1, y1, clipBox.Right, y3, f1, f3);
LineClipY(clipBox.Right, y3, clipBox.Right, y2, f3, f2);
break;
case 2: // x1 > clip.x2
y3 = y1 + MulDiv(clipBox.Right - x1, y2 - y1, x2 - x1);
f3 = ClipLiangBarsky.GetFlagsY(y3, clipBox);
LineClipY(clipBox.Right, y1, clipBox.Right, y3, f1, f3);
LineClipY(clipBox.Right, y3, x2, y2, f3, f2);
break;
case 3: // x1 > clip.x2 && x2 > clip.x2
LineClipY(clipBox.Right, y1, clipBox.Right, y2, f1, f2);
break;
case 4: // x2 < clip.x1
y3 = y1 + MulDiv(clipBox.Left - x1, y2 - y1, x2 - x1);
f3 = ClipLiangBarsky.GetFlagsY(y3, clipBox);
LineClipY(x1, y1, clipBox.Left, y3, f1, f3);
LineClipY(clipBox.Left, y3, clipBox.Left, y2, f3, f2);
break;
case 6: // x1 > clip.x2 && x2 < clip.x1
y3 = y1 + MulDiv(clipBox.Right - x1, y2 - y1, x2 - x1);
y4 = y1 + MulDiv(clipBox.Left - x1, y2 - y1, x2 - x1);
f3 = ClipLiangBarsky.GetFlagsY(y3, clipBox);
f4 = ClipLiangBarsky.GetFlagsY(y4, clipBox);
LineClipY(clipBox.Right, y1, clipBox.Right, y3, f1, f3);
LineClipY(clipBox.Right, y3, clipBox.Left, y4, f3, f4);
LineClipY(clipBox.Left, y4, clipBox.Left, y2, f4, f2);
break;
case 8: // x1 < clip.x1
y3 = y1 + MulDiv(clipBox.Left - x1, y2 - y1, x2 - x1);
f3 = ClipLiangBarsky.GetFlagsY(y3, clipBox);
LineClipY(clipBox.Left, y1, clipBox.Left, y3, f1, f3);
LineClipY(clipBox.Left, y3, x2, y2, f3, f2);
break;
case 9: // x1 < clip.x1 && x2 > clip.x2
y3 = y1 + MulDiv(clipBox.Left - x1, y2 - y1, x2 - x1);
y4 = y1 + MulDiv(clipBox.Right - x1, y2 - y1, x2 - x1);
f3 = ClipLiangBarsky.GetFlagsY(y3, clipBox);
f4 = ClipLiangBarsky.GetFlagsY(y4, clipBox);
LineClipY(clipBox.Left, y1, clipBox.Left, y3, f1, f3);
LineClipY(clipBox.Left, y3, clipBox.Right, y4, f3, f4);
LineClipY(clipBox.Right, y4, clipBox.Right, y2, f4, f2);
break;
case 12: // x1 < clip.x1 && x2 < clip.x1
LineClipY(clipBox.Left, y1, clipBox.Left, y2, f1, f2);
break;
}
m_f1 = f2;
}
else
{
ras.DrawLine(m_x1, m_y1,
x2, y2);
}
m_x1 = x2;
m_y1 = y2;
}
