void RefreshDisplay()
{
OutputState os = PrepareCalculators();
if (os != null)
{
// Refresh result label immediately
string resultText = null;
try {
foreach (var c in os.Calcs)
{
resultText = resultText == null ? "" : resultText + ", ";
resultText += CalculatorCore.Eval(c.Expr, c.Vars);
}
txtResult.Enabled = true;
} catch (Exception e) {
if (resultText == null)
{
resultText = e.Message;
}
txtResult.Enabled = false;
}
txtResult.Text = resultText;
if (_bw.IsBusy)
{
_refreshRequested = true;
return;
}
os.Bitmap = new DirectBitmap(graphPanel.ClientSize);
_bw.RunWorkerAsync(os);
}
}
DirectBitmap _prevBitmap; // bitmap used in most recent frame (often same as current)
public CalcForm()
{
InitializeComponent();
// Prepare to calculate and draw on a background thread
_bw.DoWork += (s, e) => {
var state = (OutputState)(e.Result = e.Argument);
try {
foreach (var c in state.Calcs)
{
c.Run(); // do calculations
}
state.RenderAll();
} catch {
if (state.Bitmap != _outState?.Bitmap)
{
state.Bitmap.Dispose(); // the new bitmap won't be used
}
throw;
}
};
_bw.RunWorkerCompleted += (s, e) => {
if (panelError.Visible = (e.Error != null))
{
txtError.Text = e.Error.Message;
}
else
{
_outState = (OutputState)e.Result;
if (_prevBitmap != _outState.Bitmap)
{
using (_prevBitmap)
_prevBitmap = _outState.Bitmap;
}
graphPanel.Image = _prevBitmap.Bitmap;
}
if (_refreshRequested)
{
_refreshRequested = false;
RefreshDisplay();
}
};
}
public static GraphRange New(string rangeName, LNode range, int numPixels, Dictionary <Symbol, LNode> varDict)
{
if (range == null)
{
return new GraphRange(-1, 1, numPixels, Pens.MidnightBlue, null)
{
AutoRange = true
}
}
;
if (range.Calls(CodeSymbols.Colon, 2) && range[0].IsId && string.Compare(range[0].Name.Name, rangeName, true) == 0)
{
range = range[1]; // ignore axis prefix like "x:" or "y:"
}
if (range.Calls(CodeSymbols.Sub, 2) || range.Calls(CodeSymbols.DotDot, 2))
{
double lo = CalculatorCore.Eval(range[0], varDict);
double hi = CalculatorCore.Eval(range[1], varDict);
Pen pen = OutputState.MakePen(range);
string label = range.Attrs.Select(a => a.Value as string).FirstOrDefault(s => s != null);
var result = new GraphRange(lo, hi, numPixels, pen, label)
{
RangeExpr = range
};
foreach (var attr in range.Attrs)
{
if (attr.Value is int)
{
result.RoughLineCount = (int)attr.Value;
}
}
return(result);
}
throw new FormatException("Invalid range for {axis}: {range}".Localized("axis", rangeName, "range", range));
}
}
