Xamarin Community Toolkit MathExpressionConverter
The MathExpressionConverteris a converter that allows users to calculate an expression at runtime from supplied arguments:
- x or x0 — The first argument
- x1 — The second argument
- ...
- xN-1 — The N argument
Warning
Avoid negative operations, constants or variables such as "-cos(30)", "-x" or "-pi", which will return an error. Instead, use multiplication by -1.
Syntax
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:xct="http://xamarin.com/schemas/2020/toolkit"
x:Class="MyLittleApp.MainPage">
<ContentPage.Resources>
<ResourceDictionary>
<xct:MathExpressionConverter x:Key="MathExpressionConverter" />
<xct:MultiMathExpressionConverter x:Key="MultiMathExpressionConverter" />
</ResourceDictionary>
</ContentPage.Resources>
<StackLayout>
<Frame
x:Name="CalculatedFrame"
HeightRequest="120"
CornerRadius="{Binding Source={x:Reference CalculatedFrame}, Path=HeightRequest, Converter={StaticResource MathExpressionConverter}, ConverterParameter='x/2'}">
<Label TextColor="Black">
<Label.Text>
<MultiBinding Converter="{StaticResource MultiMathExpressionConverter}"
ConverterParameter="x0 * x1"
StringFormat="The area of Frame = {0}">
<Binding Path="{Binding Source={x:Reference CalculatedFrame}, Path=HeightRequest}" />
<Binding Path="{Binding Source={x:Reference CalculatedFrame}, Path=WidthRequest}" />
</MultiBinding>
</Label.Text>
</Label>
</StackLayout>
</ContentPage>
Operations
| Operation | Example | Equivalent |
|---|---|---|
| + | x + 1 | — |
| - | x - 2 | — |
| * | x * -3 | — |
| / | x / 4 | — |
| ^ | x ^ 5 | Math.Pow |
| abs | abs(x) | Math.Abs |
| acos | acos(x) | Math.Acos |
| asin | asin(x) | Math.Asin |
| atan | atan(x) | Math.Atan |
| atan2 | atan2(x, 10) | Math.Atan2 |
| ceiling | ceiling(x) | Math.Ceiling |
| cos | cos(x) | Math.Cos |
| cosh | cosh(x) | Math.Cosh |
| exp | exp(x) | Math.Exp |
| floor | floor(x) | Math.Floor |
| ieeeremainder | ieeeremainder(x, 16) | Math.IEEERemainder |
| log | log(x, 17) | Math.Log |
| max | max(x, 18) | Math.Max |
| min | min(x, 19) | Math.Min |
| pow | round(x, 2) | Math.Pow |
| round | round(x, 1) | Math.Round |
| sign | sign(x) | Math.Sign |
| sin | sin(x) | Math.Sin |
| sinh | sinh(x) | Math.Sinh |
| sqrt | sqrt(x) | Math.Sqrt |
| tan | tan(x) | Math.Tan |
| tanh | tanh(x) | Math.Tanh |
| truncate | truncate(x) | Math.Truncate |
Constants
| Constant | Equivalent |
|---|---|
| e | Math.E |
| pi | Math.PI |
Sample
MathExpressionConverter sample page Source
You can see this in action in the Xamarin Community Toolkit Sample App.