public void DrawGraph()
{
_hzAxisY = _coords.ToYPix(0);
if (_hzAxisY < 0)
{
_hzAxisY = 0;
}
if (_hzAxisY > _coords.Height)
{
_hzAxisY = _coords.Height;
}
_hzNumsY = _hzAxisY + 14;
if (_hzAxisY > _coords.Height - 10)
{
_hzNumsY = _coords.Height - 3;
}
_vtAxisX = _coords.ToXPix(0);
if (_vtAxisX < 0)
{
_vtAxisX = 0;
}
if (_vtAxisX > _coords.Width)
{
_vtAxisX = _coords.Width;
}
_vtNumsX = _vtAxisX - 5;
if (_vtAxisX < 10)
{
_vtNumsX = 20;
}
if (_coords.UseXLog)
{
DrawLinesLogX();
}
else
{
if (_horizontalLinesVisible)
{
DrawHorizontalLines();
}
}
if (_coords.UseYLog)
{
DrawLinesLogY();
}
else
{
if (_verticalLinesVisible)
{
DrawVerticalLines();
}
}
}
private void DrawNewton(CanvasDrawingSession ds)
{
if (_parser?.RootNode == null)
{
return;
}
var width = _coords.Width;
var height = _coords.Height;
var xmin = _coords.XStart;
var xmax = _coords.XEnd;
var ymin = _coords.YStart;
var ymax = _coords.YEnd;
var xpixstep = (xmax - xmin) / width;
var ypixstep = -(ymax - ymin) / height;
var bitmap = new byte[width * height * 4]; // 4 bytes per pixel
for (var i = 0; i < bitmap.Length; i++)
{
bitmap[i] = 0;
}
var toler = xpixstep * xpixstep * 0.1;
var xGridStep = xpixstep * _nStep;
var yGridStep = ypixstep * _nStep;
for (var x1 = xmin; x1 < xmax; x1 += xGridStep)
{
for (var y1 = ymin; y1 < ymax; y1 -= yGridStep)
{
double score;
if (_nStep > 1)
{
var widefact = 1;
score = GetNewtonScore(
x1 - xpixstep * widefact,
y1 + ypixstep * widefact,
x1 + xGridStep + xpixstep * widefact,
y1 - yGridStep - ypixstep * widefact,
x1 + xGridStep / 2,
y1 - yGridStep / 2,
10,
toler * 10
);
}
else
{
score = 1;
}
if (score > 0)
{
for (int i = 0; i < _nStep; i++)
{
for (var j = 0; j < _nStep; j++)
{
var x2 = x1 + i * xpixstep;
var y2 = y1 - j * ypixstep;
score = GetNewtonScore(
x2,
y2,
x2 + xpixstep,
y2 - ypixstep,
x2 + xpixstep / 2,
y2 - ypixstep / 2,
5,
toler
);
if (score > 0)
{
var xn = (int)_coords.ToXPix(x2 + xpixstep / 2);
var yn = (int)_coords.ToYPix(y2 - ypixstep / 2);
SetPix(bitmap, xn, yn, (int)(255 * score));
}
}
}
}
}
}
var target = new CanvasRenderTarget(ds, _coords.Width, _coords.Height);
target.SetPixelBytes(bitmap);
ds.DrawImage(target);
}