{"id":2361,"date":"2012-06-01T08:58:29","date_gmt":"2012-06-01T12:58:29","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/?p=2361"},"modified":"2012-06-01T08:58:29","modified_gmt":"2012-06-01T12:58:29","slug":"friday-fun-another-powershell-console-graph","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/powershell\/2361\/friday-fun-another-powershell-console-graph\/","title":{"rendered":"Friday Fun: Another PowerShell Console Graph"},"content":{"rendered":"

Late last year I posted a demo script to create a horizontal bar graph<\/a> in the PowerShell console. I liked it and many of you did as well. But I also wanted to be able to create a vertical bar graph, ie one with columns. This is much trickier since you have to tell PowerShell exactly where to \"paint\" the graph.<\/p>\n

I've posted other articles on using the coordinates in the host and that is what I ended up doing for today's Friday Fun. This demo script only works in the PowerShell console. It will run in the ISE but you won't get the desired result. Let me post the code and then I'll go through a few things.<\/p>\n


\nParam([string]$computername=$env:computername)<\/p>\n

Clear-Host<\/p>\n

#get the data
\n$drives=Get-WmiObject -Class Win32_LogicalDisk -Filter \"drivetype=3\" -computername $computername<\/p>\n

#define a set of colors for the graphs
\n$colors=@(\"Yellow\",\"Magenta\",\"Green\",\"Cyan\",\"Red\")<\/p>\n

#set cursor position
\n$Coordinate = New-Object System.Management.Automation.Host.Coordinates
\n$Coordinate.X= 10
\n$Coordinate.Y= [int]($host.ui.rawui.WindowSize.Height -5)<\/p>\n

#save starting coordinates
\n$startY=$Coordinate.Y
\n$startX=$Coordinate.X<\/p>\n

#counter for colors
\n$c=0<\/p>\n

#adjust Y so we can write the caption
\n$Coordinate.Y+=1<\/p>\n

foreach ($drive in $drives) {
\n #set the color to the first color in the array of colors
\n $color=$colors[$c]
\n $legend=$drive.DeviceID
\n #calculate used space value
\n $used=$Drive.Size - $Drive.FreeSpace
\n [int]$usedValue=($used\/($drive.size))*10
\n #adjust for values less than 0 so something gets graphed
\n if ($usedValue -le 0) {
\n [int]$usedValue=($used\/($drive.size))*50
\n }<\/p>\n

#format usage as a percentage
\n $usedPer=\"{0:p2}\" -f ($used\/($drive.size))
\n #set the cursor to the new coordinates
\n $host.ui.rawui.CursorPosition=$Coordinate
\n #write the caption
\n write-host $legend -nonew
\n #move the Y coordinate up to start the graph
\n $coordinate.Y-=1<\/p>\n

for ($i=$usedValue;$i -gt 0;$i--) {
\n $host.ui.rawui.CursorPosition=$Coordinate
\n #draw the color space for the graph
\n write-host \" \" -BackgroundColor $color -nonewline
\n #move Y up 1
\n $coordinate.y--
\n #repeat until we reach the $usedValue
\n }
\n #set new coordinate
\n $host.ui.rawui.CursorPosition=$Coordinate
\n #write the usage percentage at the top of the bar
\n write-host $usedPer -nonewline<\/p>\n

#reset Y to where we started + 1
\n $Coordinate.Y=($startY+1)
\n #move X to the right
\n $coordinate.x+=8
\n #reset coordinates
\n $host.ui.rawui.CursorPosition=$Coordinate
\n #increment the color counter
\n $c++<\/p>\n

#repeat for the next drive<\/p>\n

} #foreach<\/p>\n

#reset coordinates so we can write a legend
\n$coordinate.Y=$StartY+2
\n$coordinate.X=$startX
\n$host.ui.rawui.CursorPosition=$Coordinate
\nwrite-host (\"Drive Usage for {0}\" -f $drives[0].__SERVER)<\/p>\n

#move cursor to bottom of the screen and write a blank line
\n$Coordinate.X=1
\n$coordinate.Y=[int]($host.ui.rawui.WindowSize.Height-2)
\n$host.ui.rawui.CursorPosition=$Coordinate
\nwrite-host \"\"<\/p>\n

#your PowerShell prompt will now be displayed
\n<\/code><\/p>\n

This script gets drive usage and creates a vertical bar chart displaying disk utilization. Everyone loves a good drive space report and they always make good demos.<\/p>\n

The script creates a System.Management.Automation.Host.Coordinates object, setting the value of X and Y that should be starting in the bottom left corner of the console.<\/p>\n


\n#set cursor position
\n$Coordinate = New-Object System.Management.Automation.Host.Coordinates
\n$Coordinate.X= 10
\n$Coordinate.Y= [int]($host.ui.rawui.WindowSize.Height -5)
\n#save starting coordinates
\n$startY=$Coordinate.Y
\n$startX=$Coordinate.X
\n<\/code><\/p>\n

I'm also saving these values so I can reset. The script will have to \"move\" the cursor around the screen to draw the graphs. Once I calculate the values for each drive, I write a blank line using Write-Host with -Backgroundcolor to get the desired graphing effect.<\/p>\n


\nfor ($i=$usedValue;$i -gt 0;$i--) {
\n $host.ui.rawui.CursorPosition=$Coordinate
\n #draw the color space for the graph
\n write-host \" \" -BackgroundColor $color -nonewline
\n #move Y up 1
\n $coordinate.y--
\n #repeat until we reach the $usedValue
\n }
\n<\/code><\/p>\n

Notice after each write I move the Y point \"up\", until I reach the limit of the current value. I set values as a percentage scaled to 10 so the graph doesn't end up outside of the buffer. I also made an adjustment for low values that wouldn't normally trigger a graph so that I get something written to the screen.<\/p>\n


\n #calculate used space value
\n $used=$Drive.Size - $Drive.FreeSpace
\n [int]$usedValue=($used\/($drive.size))*10
\n #adjust for values less than 0 so something gets graphed
\n if ($usedValue -le 0) {
\n [int]$usedValue=($used\/($drive.size))*50
\n }
\n<\/code><\/p>\n

After drawing the graph I move the cursor position back to the beginning and write a legend.<\/p>\n


\n#reset coordinates so we can write a legend
\n$coordinate.Y=$StartY+2
\n$coordinate.X=$startX
\n$host.ui.rawui.CursorPosition=$Coordinate
\nwrite-host (\"Drive Usage for {0}\" -f $drives[0].__SERVER)
\n<\/code><\/p>\n

Here's the end result.<\/p>\n

\"\"<\/a><\/p>\n

This script is really just a proof of concept. I haven't created any functions to simply any of this or make it easy to use with other values. This is also a bit advanced so if you look at this and it makes your head hurt, don't worry about it. You would only use something like this in special cases. Still, I'd like to know what you think, how it works for you and if you extend it to a more re-usable form.<\/p>\n

Download demo-bargraph<\/a>. The script will default to the local computer, but you can run specify any computer you want.<\/p>\n


\nPS C:\\Scripts\\> .\\demo-bargraph.ps1 Mycomputer
\n<\/code><\/p>\n

Enjoy and have fun.<\/p>\n","protected":false},"excerpt":{"rendered":"

Late last year I posted a demo script to create a horizontal bar graph in the PowerShell console. I liked it and many of you did as well. But I also wanted to be able to create a vertical bar graph, ie one with columns. 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What I find frustrating is the use of\u2026","rel":"","context":"In "PowerShell"","block_context":{"text":"PowerShell","link":"https:\/\/jdhitsolutions.com\/blog\/category\/powershell\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/jdhitsolutions.com\/blog\/wp-content\/uploads\/2011\/12\/colordrivegraph-300x129.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":449,"url":"https:\/\/jdhitsolutions.com\/blog\/powershell\/449\/drive-report-console-chart\/","url_meta":{"origin":2361,"position":1},"title":"Drive Report Console Chart","author":"Jeffery Hicks","date":"October 15, 2009","format":false,"excerpt":"In thinking about some of my recent posts, I realize I should make clear that these scripts and functions are not necessarily good PowerShell examples. They don\u2019t take advantage of objects and the pipeline. They are single purpose and one-dimensional. Not that there\u2019s anything wrong with that. 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