public async Task Calc([Remainder] string expression)
{
try
{
double result = ExpressionSolver.SolveExpression(expression);
await ReplyAsync(result.ToString());
}
catch (ParseException e)
{
await ReplyAsync(e.Message);
}
}
public async Task Graph(Size size, [Remainder] string expression)
{
int height = size.Height;
int width = size.Width;
if (height * width > 1000000)
{
await ReplyAsync($"Please use a grid with an area less than or equal to 1,000,000.");
return;
}
else if (width < 100 || height < 100)
{
await ReplyAsync($"Graphs must have a width and height of at least 100");
return;
}
try
{
using Stream stream = await Task.Run(() =>
{
using Bitmap graph = new Bitmap(width % 10 == 0 ? width + 1 : width, height % 10 == 0 ? height + 1 : height);
using Graphics graphics = Graphics.FromImage(graph);
graphics.Clear(Color.White);
for (int x = 0; x < graph.Width; x += width / 10)
{
graphics.DrawLine(new Pen(Color.Gray, 1), x, 0, x, graph.Height - 1);
}
for (int y = 0; y < graph.Width; y += height / 10)
{
graphics.DrawLine(new Pen(Color.Gray, 1), 0, y, graph.Width - 1, y);
}
ExpressionSolver solver = new ExpressionSolver(expression, true);
IExpression expr = solver.Parse();
for (double x = -graph.Width / 2; x < graph.Width / 2; x += 0.01)
{
solver.SetVariable('x', new Number(x));
double y = Math.Round(expr.Evaluate()) + graph.Height / 2;
int yPlot = graph.Height - (int)y - 1;
if (yPlot < 0 || yPlot >= graph.Height || double.IsNaN(y))
{
continue;
}
graph.SetPixel((int)x + graph.Width / 2, yPlot, Color.Red);
}
MemoryStream stream = new MemoryStream();
graph.Save(stream, ImageFormat.Png);
stream.Position = 0;
return(stream);
});
// Using Discord namespace conflicts with System.Drawing classes
Discord.Embed embed = new Discord.EmbedBuilder()
.WithTitle("Graphing Calculator")
.WithDescription($"Expression: y = {expression}\nSize: {height}x{width}")
.WithImageUrl("attachment://graph.png")
.Build();
await Context.Channel.SendFileAsync(stream, "graph.png", embed : embed);
}
catch (ParseException e)
{
await ReplyAsync(e.Message);
}
}
