====== Using expressions to create a dynamic watchface ======
Use operators, mathematical functions or conditional statements to build a more dynamic watchface.

===== Built-in operators =====
Watchface Builder supports following operators:
      * Addition: 2 + 2
      * Subtraction: 2 - 2
      * Multiplication: 2 * 2
      * Division: 2 / 2
      * Exponentation: 2 ^ 2
      * Unary Minus,Plus (Sign Operators): +2 - (-2)
      * Modulo: 2 % 2

===== Mathematical Functions =====
You can also use mathematical functions for your expression. These expressions are supported:

      * abs: absolute value
      * acos: arc cosine
      * asin: arc sine
      * atan: arc tangent
      * cbrt: cubic root
      * ceil: nearest upper integer
      * cos: cosine
      * cosh: hyperbolic cosine
      * exp: euler's number raised to the power (e^x)
      * floor: nearest lower integer
      * log: logarithmus naturalis (base e)
      * log10: logarithm (base 10)
      * log2: logarithm (base 2)
      * sin: sine
      * sinh: hyperbolic sine
      * sqrt: square root
      * tan: tangent
      * tanh: hyperbolic tangent

==== Example ====
<code>ceil({wct})</code>
Returns the integer value for the current temperature

===== Conditional statements  =====
You can use condition statements. The syntax is:

<code>$condition?true value:false value$</code>

Following operators are supported for a condition:
  * greater equal >=
  * lower equal <=
  * lower <
  * greater >
  * equals ==
  * not equals !=

==== Example ====
For example if you want a blinking watchface layer set following expression on your opacity property.

<code>${ds}%2==0?100:0$</code>

Every time the seconds value changes and the value divided by two gives no rest, the layer will be displayed.