unsafe void generate_alpha_mask(int cx, int cy)
{
m_alpha_buf = new byte[cx * cy];
fixed(byte *pAlphaBuffer = m_alpha_buf)
{
#if USE_CLIPPING_ALPHA_MASK
m_alpha_mask_rbuf.attach(pAlphaBuffer + 20 * cx + 20, (uint)cx - 40, (uint)cy - 40, cx, 1);
#else
m_alpha_mask_rbuf.attach(pAlphaBuffer, (uint)cx, (uint)cy, cx, 1);
#endif
FormatGray pixf = new FormatGray(m_alpha_mask_rbuf, new BlenderGray(), 1, 0);
FormatClippingProxy clippingProxy = new FormatClippingProxy(pixf);
ScanlinePacked8 sl = new ScanlinePacked8();
clippingProxy.Clear(new RGBA_Doubles(0));
VertexSource.Ellipse <T> ell = new AGG.VertexSource.Ellipse <T>();
System.Random randGenerator = new Random(1432);
int i;
int num = (int)m_num_cb.value().ToInt();
for (i = 0; i < num; i++)
{
if (i == num - 1)
{
ell.Init(width().Divide(2), height().Divide(2), M.New <T>(110), M.New <T>(110), 100);
g_rasterizer.AddPath(ell);
Renderer <T> .RenderSolid(clippingProxy, g_rasterizer, sl, new RGBA_Bytes(0, 0, 0, 255));
ell.Init(ell.X, ell.Y, ell.RX.Subtract(10), ell.RY.Subtract(10), 100);
g_rasterizer.AddPath(ell);
Renderer <T> .RenderSolid(clippingProxy, g_rasterizer, sl, new RGBA_Bytes(255, 0, 0, 255));
}
else
{
ell.Init(randGenerator.Next() % cx,
randGenerator.Next() % cy,
randGenerator.Next() % 100 + 20,
randGenerator.Next() % 100 + 20,
100);
// set the color to draw into the alpha channel.
// there is not very much reason to set the alpha as you will get the amount of
// transparency based on the color you draw. (you might want some type of different edeg effect but it will be minor).
g_rasterizer.AddPath(ell);
Renderer <T> .RenderSolid(clippingProxy, g_rasterizer, sl, new RGBA_Bytes((uint)((float)i / (float)num * 255), 0, 0, 255));
}
}
m_alpha_mask_rbuf.dettachBuffer();
}
}
public override void OnDraw()
{
FormatRGB pf = new FormatRGB(rbuf_window(), new BlenderBGR());
FormatGray pfr = new FormatGray(rbuf_window(), new BlenderGray(), 3, 2);
FormatGray pfg = new FormatGray(rbuf_window(), new BlenderGray(), 3, 1);
FormatGray pfb = new FormatGray(rbuf_window(), new BlenderGray(), 3, 0);
FormatClippingProxy clippingProxy = new FormatClippingProxy(pf);
FormatClippingProxy clippingProxyRed = new FormatClippingProxy(pfr);
FormatClippingProxy clippingProxyGreen = new FormatClippingProxy(pfg);
FormatClippingProxy clippingProxyBlue = new FormatClippingProxy(pfb);
RasterizerScanlineAA <T> ras = new RasterizerScanlineAA <T>();
ScanlinePacked8 sl = new ScanlinePacked8();
clippingProxy.Clear(m_UseBlackBackground.status() ? new RGBA_Doubles(0, 0, 0) : new RGBA_Doubles(1, 1, 1));
RGBA_Bytes FillColor = m_UseBlackBackground.status() ? new RGBA_Bytes(255, 255, 255, (uint)(m_alpha.value().ToInt())) : new RGBA_Bytes(0, 0, 0, (uint)(m_alpha.value().ToInt()));
VertexSource.Ellipse <T> er = new AGG.VertexSource.Ellipse <T>(width().Divide(2).Subtract(0.87 * 50), height().Divide(2).Subtract(0.5 * 50), M.New <T>(100), M.New <T>(100), 100);
ras.AddPath(er);
Renderer <T> .RenderSolid(clippingProxyRed, ras, sl, FillColor);
VertexSource.Ellipse <T> eg = new AGG.VertexSource.Ellipse <T>(width().Divide(2).Add(0.87 * 50), height().Divide(2).Subtract(0.5 * 50), M.New <T>(100), M.New <T>(100), 100);
ras.AddPath(eg);
Renderer <T> .RenderSolid(clippingProxyGreen, ras, sl, FillColor);
//renderer_scanlines.render_scanlines_aa_solid(ras, sl, rbg, new gray8(0, unsigned(m_alpha.Value())));
VertexSource.Ellipse <T> eb = new AGG.VertexSource.Ellipse <T>(width().Divide(2), height().Divide(2).Add(50), M.New <T>(100), M.New <T>(100), 100);
ras.AddPath(eb);
Renderer <T> .RenderSolid(clippingProxyBlue, ras, sl, FillColor);
//renderer_scanlines.render_scanlines_aa_solid(ras, sl, rbb, new gray8(0, unsigned(m_alpha.Value())));
//m_alpha.Render(ras, sl, clippingProxy);
//m_UseBlackBackground.Render(ras, sl, clippingProxy);
base.OnDraw();
}
