How do I invert the y-axis on my JQplot JavaScript line chart using the jqplot.canvasAxisTickRenderer?

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I am having trouble inverting the left-side y-axis on my line chart, which is generated by jQuery/JQplot scripts.

I have two separate JavaScript arrays with identical x values (dates) in both arrays. My chart has a y-axis and a y2axis. I would like to invert the y-axis so that the lower values start from the top down, instead of bottom up.

This is a snippet of my code:

C#

var rsWell2 =['3/30/2000', 74.38], ['1/26/2001', 62.23], ['2/15/2002', 63.67...
var rsWell4 = ['3/30/2000', -53.38], ['1/26/2001', -41.23], ['2/15/2002', -42.67]...


var plot1 = $.jqplot('chart', [rsWell2, rsWell4], { ...


xaxis:{
                        tickOptions:{
                            fontSize: '9pt',
                            angle:-60,
                            formatString:'%D'
                        },
                        tickRenderer:$.jqplot.CanvasAxisTickRenderer,

                        label: 'Date',
                        renderer:$.jqplot.DateAxisRenderer


                    },



yaxis:{

                       label: 'Depth to Water Level (ft below land)',
                       labelRenderer: $.jqplot.CanvasAxisLabelRenderer,

                       rendererOptions:{

                           tickRenderer:$.jqplot.CanvasAxisTickRenderer},
                       tickOptions:{
                           fontSize: ...
                           formatString: ...
                           alignTicks: true

                           //min: Math.max.apply(null, rsWell2),
                           //max: Math.min.apply(null, rsWell2)

                       }

y2axis:{
                        
                            tickOptions:{...}
                         
                        }

Because my array values are always changing, I cannot specify a min and max value. I have tried many different ways and am now very frustrated! How can I accomplish this? Any help is greatly appreciated.

Liz

Posted 10-Jul-15 10:09am

Liz Heal

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Comments

Sergey Alexandrovich Kryukov 10-Jul-15 23:53pm

How about y -> y_max - y?
—SA

Liz Heal 13-Jul-15 10:07am

This is what I currently have:

var rsWell6 = rsWell5.slice(1);
var minVal = Math.min.apply(null, rsWell6);
var maxVal = Math.max.apply(null, rsWell6);

//need to fix math here

var minVal1 = Math.floor(minVal) - 10;
var maxVal1 = Math.round(maxVal) + 10;

more code...

rendererOptions:{
alignTicks: true,
min: maxVal1,
max: minVal1,

...

This does work. However, the tick scaling does not line up correctly to the other y-axis. Any thoughts?

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