Use expressions to change values

[alehtinen]

Been testing nexrender for few days and found out that sometimes "expression" works better than "value" and it allows you to somewhat simplify your script. For at least color and text this seems to work pretty well.

For color, instead of using something like "value": [0.137, 0.784, 0.125] (example from old thread) you could use
"expression": "(hexToRgb('23c820'))" to achieve the same thing with hex color code.

And for text, instead of having, lets say three different blocks for font, text and color values, you could use

      {
          "type": "data",
          "layerName": "my text field",
          "property": "Source Text",
          "expression": "style.setText('INSERT TEXT HERE').setFont('Arial-BoldItalicMT').setFillColor(hexToRgb('ffffff'))"
      }