/// <summary>
/// Plots this Equation onto the specified <paramref name="graph"/> with the given <paramref name="plotParams"/>.
/// This method will determine which method of plotting is most appropriate for this equation. This could be the
/// implicit plotting method for implicit equations, or explicit plotting with respect to one of the two plotted
/// variables in the graph. Explicit plotting will be attempted wherever possible.
/// </summary>
/// <param name="graph">The Graph to plot this IPlottable onto.</param>
/// <param name="graphics">The GDI+ drawing surface to use for plotting this IPlottable.</param>
/// <param name="graphSize">The size of the Graph on the screen. This is a property of the display rather than the
/// graph and is thus not included in the graph's parameters.</param>
/// <param name="plotParams">The parameters used to plot this IPlottable.</param>
/// <param name="resolution">The plotting resolution to use. Using a coarser resolution may make the plotting
/// process faster, and is thus more suitable when the display is being resized or moved.</param>
public void PlotOnto(Graph graph, Graphics graphics, Size graphSize, PlottableParameters plotParams, PlotResolution resolution)
{
if (resolution == PlotResolution.Resize)
{
return;
}
if (ParseTree == null)
{
Parse();
}
BinaryParseTreeNode parseTreeRoot = ParseTree as BinaryParseTreeNode;
var originalSmoothingMode = graphics.SmoothingMode;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; // smoother pen for the graph
using (Pen graphPen = new Pen(plotParams.PlotColor, EquationPenWidth))
{
if (parseTreeRoot.Left is VariableParseTreeNode && // if the only instance of a variable is on the left eg. y=x+1
!parseTreeRoot.Right.ContainsVariable((parseTreeRoot.Left as VariableParseTreeNode).Variable))
{
PlotExplicit(
graph,
graphics,
graphSize,
graphPen,
(parseTreeRoot.Left as VariableParseTreeNode).Variable,
parseTreeRoot.Right,
resolution);
}
else if (parseTreeRoot.Right is VariableParseTreeNode && // if the only instance of a variable is on the right eg. y-1=x
!parseTreeRoot.Left.ContainsVariable((parseTreeRoot.Right as VariableParseTreeNode).Variable))
{
PlotExplicit(
graph,
graphics,
graphSize,
graphPen,
(parseTreeRoot.Right as VariableParseTreeNode).Variable,
parseTreeRoot.Left,
resolution);
}
else // if variables are equated implicitly eg. xy=x+y-x^2
{
PlotImplicit(graph, graphics, graphSize, graphPen, resolution);
}
}
graphics.SmoothingMode = originalSmoothingMode;
}
/// <summary>
/// Plots this DataSet onto <paramref name="graph"/>.
/// </summary>
/// <param name="graph">The Graph to plot this IPlottable onto.</param>
/// <param name="graphics">The GDI+ drawing surface to use for plotting this IPlottable.</param>
/// <param name="graphSize">The size of the Graph on the screen. This is a property of the display rather than the
/// graph and is thus not included in the graph's parameters.</param>
/// <param name="plotParams">The parameters used to plot this IPlottable.</param>
/// <param name="resolution">The plotting resolution to use. This does not have an effect for data sets.</param>
public void PlotOnto(Graph graph, Graphics graphics, Size graphSize, PlottableParameters plotParams, PlotResolution resolution)
{
if (resolution == PlotResolution.Resize)
{
return;
}
int horizontalVariableIndex = IndexOfVariable(graph.Parameters.HorizontalAxis),
verticalVariableIndex = IndexOfVariable(graph.Parameters.VerticalAxis);
if (horizontalVariableIndex == -1)
{
throw new Exception("This data set cannot be plotted over the " +
graph.Parameters.HorizontalAxis.ToString() +
" variable, as it does not contain such a variable.");
}
if (verticalVariableIndex == -1)
{
throw new Exception("This data set cannot be plotted over the " +
graph.Parameters.VerticalAxis.ToString() +
" variable, as it does not contain such a variable.");
}
using (Pen dataPointPen = new Pen(plotParams.PlotColor, DataPointPenWidth))
{
foreach (double[] row in Data)
{
double horizontal = row[horizontalVariableIndex],
vertical = row[verticalVariableIndex];
int graphX, graphY;
graph.ToImageSpace(
graphSize,
horizontal, vertical,
out graphX, out graphY);
graphics.DrawLine(dataPointPen, graphX - DataPointCrossSize, graphY - DataPointCrossSize, graphX + DataPointCrossSize, graphY + DataPointCrossSize);
graphics.DrawLine(dataPointPen, graphX - DataPointCrossSize, graphY + DataPointCrossSize, graphX + DataPointCrossSize, graphY - DataPointCrossSize);
}
}
}
