public Stream Render(string latex)
{
var painter = new MathPainter {
LaTeX = latex
};
var path = Path.GetTempFileName();
var measures = painter.Measure();
SKBitmap bitMap = new SKBitmap(
width: ((int)measures.Width) + 2 * LatexBorder,
height: ((int)measures.Height) + 2 * LatexBorder
);
var canvas = new SKCanvas(bitMap);
painter.Draw(
canvas: canvas,
point: new SKPoint(LatexBorder, (measures.Height / 2.0f) + LatexBorder)
);
canvas.Flush();
using (var image = SKImage.FromBitmap(bitMap))
using (var data = image.Encode(SKEncodedImageFormat.Png, 100))
{
// save the data to a stream
using var streamf = File.OpenWrite(path);
data.SaveTo(streamf);
}
return(File.Open(path, FileMode.Open));
}
protected override void OnResultadoPaintSurface(SKSurface s, SKImageInfo i)
{
base.OnResultadoPaintSurface(s, i);
if (ViewModel == null)
{
return;
}
var p = new MathPainter(12)
{
TextColor = SKColors.White
};
p.LaTeX = (Result) ? @"\text{Es un número primo}" : @"\text{No es un número primo}";
var pM = p.Measure;
if (pM.HasValue)
{
Resultado.WidthRequest = pM.Value.Width;
Resultado.HeightRequest = pM.Value.Height;
}
p.Draw(s.Canvas, alignment: CSharpMath.Rendering.TextAlignment.Left);
}
virtual protected void OnEnunciadoPaintSurface(SKSurface s, SKImageInfo i)
{
s.Canvas.Clear(SKColors.Green);
if (ViewModel == null)
{
return;
}
var p = new MathPainter(12)
{
TextColor = SKColors.White
};
p.LaTeX = $@"\text{{{ViewModel?.Numero}. {EnunciadoStr}}}";
var pM = p.Measure;
if (pM.HasValue)
{
Enunciado.WidthRequest = pM.Value.Width;
Enunciado.HeightRequest = pM.Value.Height;
}
p.Draw(s.Canvas, alignment: CSharpMath.Rendering.TextAlignment.Left);
}
public int Add(MathPainter argPainter)
{
var pId = Interlocked.Increment(ref mLastId);
mPainters[pId] = argPainter;
return(pId);
}
private static bool TryRender(string input, out Image image, out string errorMessage)
{
MathPainter painter = new MathPainter {
LaTeX = input, FontSize = 25, DisplayErrorInline = false
};
try
{
Stream stream = painter.DrawAsStream(format: SKEncodedImageFormat.Png);
image = Image.FromStream(stream);
errorMessage = null;
return(true);
}
catch (NullReferenceException)
{
image = null;
errorMessage = painter.ErrorMessage;
return(false);
}
}
public static void BindDisplay(this MathKeyboard keyboard,
SKCanvasView view, MathPainter settings, SKColor caretColor,
CaretShape caretShape = CaretShape.IBeam, SKStrokeCap cap = SKStrokeCap.Butt)
{
view.EnableTouchEvents = true;
view.Touch +=
(sender, e) => {
if (e.ActionType == SKTouchAction.Pressed)
{
keyboard.MoveCaretToPoint(new System.Drawing.PointF(e.Location.X, e.Location.Y));
}
};
keyboard.RedrawRequested += (_, __) => view.InvalidateSurface();
view.PaintSurface +=
(sender, e) => {
var c = e.Surface.Canvas;
c.Clear();
MathPainter.DrawDisplay(settings, keyboard.Display, c);
keyboard.DrawCaret(new SkiaCanvas(c, cap, AntiAlias.Enable), caretColor.FromNative(), caretShape);
};
}
public Size CalcSize(MathPainter p) => p.Measure.Value.Size.ToSize() + new Size(4, 4);
public MainPage()
{
// Basic functionality
var view = new SKCanvasView {
HeightRequest = 225
};
var keyboard = new MathKeyboard();
var viewModel =
(Rendering.MathKeyboard) typeof(MathKeyboard)
.GetField("Keyboard", BindingFlags.NonPublic | BindingFlags.Instance)
.GetValue(keyboard);
view.EnableTouchEvents = true;
view.Touch +=
(sender, e) => {
if (e.ActionType == SKTouchAction.Pressed)
{
viewModel.MoveCaretToPoint
(new System.Drawing.PointF(e.Location.X, e.Location.Y));
}
};
keyboard.RedrawRequested += (_, __) => view.InvalidateSurface();
view.PaintSurface +=
(sender, e) => {
var c = e.Surface.Canvas;
c.Clear();
MathPainter.DrawDisplay(new MathPainter {
TextColor = SKColors.Black
},
keyboard.Display, c);
keyboard.DrawCaret(c, CaretShape.IBeam);
};
// Input from physical keyboard
var entry = new Entry {
Placeholder = "Enter keystrokes..."
};
entry.TextChanged += (sender, e) => {
entry.Text = "";
foreach (var c in e.NewTextValue)
{
viewModel.KeyPress((Editor.MathKeyboardInput)c);
}
};
// Debug labels
var latex = new Label {
Text = "LaTeX = "
};
var ranges = new Label {
Text = "Ranges = "
};
var index = new Label {
Text = "Index = "
};
viewModel.RedrawRequested += (sender, e) => {
latex.Text = "LaTeX = " + viewModel.LaTeX;
ranges.Text = "Ranges = " + string.Join(", ",
((ListDisplay <Fonts, Glyph>)viewModel.Display).Displays.Select(x => x.Range));
index.Text = "Index = " + viewModel.InsertionIndex;
};
// Assemble
Content = new StackLayout
{
Children = { latex, ranges, index, view, keyboard, entry }
};
}
