Dynamically changing plot height?

[Victor Kryukov]

Hello,

is there an easy way to change the height of the plot? I know about the 'height = ' argument to plotOutput, but I'm plotting charts based on dynamically generated results. Sometimes I want charts to be just 400px, as it would be enough to show my data, while in othercase I want them as tall as 1100px. In other cases yet, I don't want to show the plot at all and don't want to have an empty space in place of chart.

Any ideas?

[Victor Kryukov]

Nevermind - I just realized that uiOutput / renderUI is what I need.

[Joe Cheng]

You don't need to use renderUI for this case, instead use the renderPlot method's height argument and pass it a function, not a number. The function will be evaluated reactively and the return value is expected to be a number, which will be used as the height of the plot in pixels. The only other thing you need to do is pass height="auto" to plotOutput (since the height is going to be determined by the renderPlot height function).

I believe this is documented somewhat in ?renderPlot.

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[Victor Kryukov]

Thanks Joe, this is brilliant. For some reason I didn't look at renderPlot, just plotOutput, and yes, it is documented pretty clearly in renderPlot. 

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[Josh Lindsteadt]

Hey guys,  I am still struggling with this. I created assetheight() function to calculate the changing height of the plot, but currently it says it cannot execute because it is not inside a reactive function.  I have tried moving the height function around, but without any luck. How would I modify the following code to be able to dynamically change the height? Thanks.

    output$riskretPlot <- renderPlot(function(){

      makeAssetPlot()

    }, height=assetheight(), width=800)

[Joe Cheng]

Just need to remove the first "function()" (as renderPlot takes an expression, not a function); and then remove the () from assetheight (as the height parameter is a function, not an expression).

    output$riskretPlot <- renderPlot({

      makeAssetPlot()

    }, height=assetheight, width=800)

It is a little inconsistent, I know.

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[Will L]

What should assetheight be to make the aspect ratio 1?