Adjust The minValue

At the very least, you must set the minValue  property on scaleY .

scaleY: {
    minValue:20
    ...
}

Example:  https://demos.zingchart.com/view/embed/0P1S746R

If you'd like to set the minimum value programmatically, you can the ZingChart API do some preprocessing and analysis before rendering the chart. Say we want to to set the chart 'minValue' to be 10 below the lowest value, we can do that dynamically with 'zingchart.bind(null,'dataparse',...)'

zingchart.bind(null, 'dataparse', function(e,oGraph) {
  var dynamicMinvalue = 0;
 
  // sanity checks so we don't throw console error with malformed graph JSON
  if (oGraph && oGraph.graphset && oGraph.graphset[0]) {
    if (oGraph.graphset[0].series && oGraph.graphset[0].series[0]) {
      dynamicMinvalue = oGraph.graphset[0].series[0].values.reduce(function(a,b) {
        return Math.min(a, b);
      });
      oGraph.graphset[0].scaleY.minValue = (dynamicMinvalue - 10);
    }
  }
 
  return oGraph;
});

Example: https://demos.zingchart.com/view/embed/0P1S746R

Hide The Value

Apart from changing the minimum value. You can hide the value. In ZingChart we call this the scale item.

scaleY: {
    item: { // hide y zero
        rules: [
            {
                rule: '%i === 0',
                visible:false
            }  
        ]
    }
},
scaleX: {
    item: { // move x zero
        rules: [
            {
                rule: '%i === 0',
                offsetX: -10
            }  
        ]
    }
},

Example: https://demos.zingchart.com/view/embed/0P1S746R

Documentation

scales Tutorial
scale-x JSON Docs
scale-y JSON Docs
dataparse API Event

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