Another wxPerl example ported from the "wxBook" and wxIndustrial Controls. This one draws a round panel meter. Move your mouse across the meter display to move the needle.
Use this meter with Device::Serialport::Arduino to display analog data from your Arduino of choice.
#! /home/pete/CitrusPerl/perl/bin/perl
#
# AngularMeter.pl
# This script draws a simulated round panel meter.
#
#
# Written in wxPerl. Tested on Citrus Perl 5.16 with wxWidgets 2.8.x.
# Ported by: James M. Lynes. Jr.
# Last Modified Date: January 20, 2013
#
# Adapted from AngularMeter.cpp by Marco Cavallini
# based in part(mostly) on the work of
# the KWIC project (http://www.koansoftware.com/kwic/index.htm).
# Referenced on pg 596 of the "Wx Book" -
# "Cross-Platform GUI Programming with wxWidgets", Smart, Hock, & Csom
+or
#
# Added limit checking with green/red zones - Normal/Hi-limit
# could reverse colors to alarm on a low limit if needed.
# Added animation - ***Needle follows left/right mouse movement***
# Added Meter identification label
# Could add mouse click event to capture value at that point
# and use the meter as an input device.
#
use 5.010;
use strict;
use warnings;
use Wx qw(:everything :allclasses);
use Wx::Event qw( EVT_PAINT EVT_SIZE EVT_MOTION);
use Math::Trig;
#
# Configuration Data -------------------------------------------------
+-----------------
#
my $MeterWidth = 350; # Define the meter size
my $MeterHeight = $MeterWidth; # Must be square to look
+ right
my $ScaledVal = 0;
my $RealVal = 0;
my $Tick = 9; # Number of tic marks
my $Sec = 2; # Number of sections - green/red
my $RangeStart = 0; # Define Meter Span - Min
my $RangeEnd = 100; # - Max
my $AlarmLimit = 65; # Alarm Limit
my $AngleStart = -20; # East is 0 degrees, + is CCW
my $AngleEnd = 200;
my @SectorColours = (wxGREEN, wxRED); # Only using two sect
+ions
my $BackColour = wxLIGHT_GREY;
my $NeedleColour = wxBLACK;
my $BorderColour = wxBLUE;
my $PI = 4.0*atan(1.0);
my $Font = Wx::Font->new(10, wxFONTFAMILY_SWISS, wxNORMAL, wxNORMAL);
my $DrawCurrent = 1; # Turn on/off value displayed
+as text
my $Label = "Process Temperature - degC"; # Label Meter at bott
+om of display
my $ramp = 25; # Initial value/needle position
my $lastpos = 0; # Last mouse position
#
# Main Application ---------------------------------------------------
+--------------------
#
my $app = Wx::SimpleApp->new;
my $frame = Wx::Frame->new(undef, -1, "Simulated Round Panel Meter",
wxDefaultPosition, [$MeterWidth, $MeterHeight]);
SetValue($ramp); # Initial value/needle position
EVT_PAINT( $frame, \&onPaint );
EVT_SIZE( $frame, \&onSize );
EVT_MOTION( $frame, \&onMotion );
$frame->Show;
$app->MainLoop;
#
# Dismiss a size event
#
sub onSize{
my($self, $event) = @_;
$event->Skip();
}
sub onMotion { # Change the setpoint value and
+redraw
my($self, $event) = @_;
my $x = $event->GetPosition->x; # Current mouse positio
+n
if($x > $lastpos) {$ramp += 1; $lastpos = $x} # Mouse right, in
+crement needle
if($x < $lastpos) {$ramp -= 1; $lastpos = $x} # Mouse left, dec
+rement needle
if($ramp >= $RangeEnd) {$ramp = $RangeEnd;} # Clamp to max
+range
if($ramp <= $RangeStart) {$ramp = $RangeStart;} # Clamp to min
+range
SetValue($ramp);
$self->Refresh;
$self->Update;
}
#
# Paint the simulated LCD Display ------------------------------------
+----------------------
#
sub onPaint {
my($self, $event) = @_;
my $dc = Wx::PaintDC->new($self);
my( $w, $h) = $dc->GetSizeWH();
my $memdc = Wx::MemoryDC->new();
$memdc->SelectObject(Wx::Bitmap->new($MeterWidth, $MeterHeight));
my $brush = Wx::Brush->new($BackColour, wxSOLID);
$memdc->SetBackground($brush);
$memdc->SetBrush($brush);
$memdc->Clear();
my $pen = Wx::Pen->new($BorderColour, 2, wxSOLID);
$memdc->SetPen($pen);
$memdc->DrawRectangle(0, 0, $w, $h);
DrawSectors($memdc);
if($Tick > 0) {DrawTicks($memdc);}
DrawNeedle($memdc);
if($DrawCurrent) { # Display current value as t
+ext
my $valuetext = sprintf("%d", $RealVal);
my @te = $memdc->GetTextExtent($valuetext);
my $x = ($w-$te[0])/2;
$memdc->SetFont($Font);
$memdc->DrawText($valuetext, $x, ($h/2)+20);
}
DrawLabel($memdc);
$dc->Blit(0, 0, $w, $h, $memdc, 0, 0);
}
sub DrawNeedle {
my($dc) = @_;
my($w, $h) = $dc->GetSizeWH();
my $pen = Wx::Pen->new($NeedleColour, 1, wxSOLID);
$dc->SetPen($pen);
my $brush = Wx::Brush->new($NeedleColour, wxSOLID);
$dc->SetBrush($brush);
my $val = ($ScaledVal + $AngleStart) * $PI/180;
my $dyi = sin($val-90)*2;
my $dxi = cos($val-90)*2;
my @points;
$points[0] = Wx::Point->new($w/2-$dxi, $h/2-$dyi);
$dxi = cos($val) * ($h/2-4);
$dyi = sin($val) * ($h/2-4);
$points[2] = Wx::Point->new($w/2-$dxi, $h/2-$dyi);
$dxi = cos($val+90)*2;
$dyi = sin($val+90)*2;
$points[4] = Wx::Point->new($w/2-$dxi, $h/2-$dyi);
$points[5] = $points[0];
$val = ($ScaledVal + $AngleStart + 1) * $PI/180;
$dxi = cos($val) * ($h/2-10);
$dyi = sin($val) * ($h/2-10);
$points[3] = Wx::Point->new($w/2-$dxi, $h/2-$dyi);
$val = ($ScaledVal + $AngleStart - 1) * $PI/180;
$dxi = cos($val) * ($h/2-10);
$dyi = sin($val) * ($h/2-10);
$points[1] = Wx::Point->new($w/2-$dxi, $h/2-$dyi);
$dc->DrawPolygon(\@points, 0, 0, wxODDEVEN_RULE);
$brush = Wx::Brush->new(wxWHITE, wxSOLID); # Draw white
+ dot at base of needle
$dc->SetBrush($brush);
$dc->DrawCircle($w/2, $h/2, 4);
}
sub DrawSectors {
my($dc) = @_;
my($w, $h) = $dc->GetSizeWH();
my $pen = Wx::Pen->new(wxBLACK, 1, wxSOLID);
$dc->SetPen($pen);
my $starc = $AngleStart;
my $endarc = $starc + (($AngleEnd - $AngleStart) * ($AlarmLimit/$R
+angeEnd));
my $ctr = 0;
while($ctr < $Sec) {
my $brush = Wx::Brush->new($SectorColours[$ctr], wxSOLID);
$dc->SetBrush($brush);
$dc->DrawEllipticArc(0, 0, $w, $h, 180-$endarc, 180-$starc);
$starc = $endarc;
$endarc = $AngleEnd;
$ctr++;
}
my $val = $AngleStart * $PI / 180;
my $dx = cos($val) * $h/2;
my $dy = sin($val) * $h/2;
$dc->DrawLine($w/2, $h/2, $w/2-$dx, $h/2-$dy);
$val = $AngleEnd * $PI / 180;
$dx = cos($val) * $h/2;
$dy = sin($val) * $h/2;
$dc->DrawLine($w/2, $h/2, $w/2-$dx, $h/2-$dy);
}
sub DrawTicks {
my($dc) = @_;
my($w, $h) = $dc->GetSizeWH();
my $interval = ($AngleEnd - $AngleStart) / ($Tick +1);
my $valint = $interval + $AngleStart;
my $ctr = 0;
while($ctr < $Tick) {
my $val = $valint * $PI/180;
my $dx = cos($val) * $h/2;
my $dy = sin($val) * $h/2;
my $tx = cos($val) * (($h/2)-10);
my $ty = sin($val) * (($h/2)-10);
$dc->DrawLine($w/2-$tx, $h/2-$ty, $w/2-$dx, $h/2-$dy);
my $DeltaRange = $RangeEnd - $RangeStart;
my $DeltaAngle = $AngleEnd - $AngleStart;
my $Coeff = $DeltaAngle / $DeltaRange;
my $rightval = (($valint - $AngleStart) / $Coeff) + $RangeStar
+t;
my $string = sprintf("%d", $rightval+.5);
my($tew, $teh, $dct, $ext) = $dc->GetTextExtent($string);
$val = ($valint - 4) * $PI/180;
$tx = cos($val) * (($h/2)-12);
$ty = sin($val) * (($h/2)-12);
$dc->SetFont($Font);
$dc->DrawRotatedText($string, $w/2-$tx, $h/2-$ty, 90-$valint);
$valint = $valint + $interval;
$ctr++;
}
}
sub SetValue { # Scale the value for displa
+y
my($Value) = @_;
my $DeltaRange = $RangeEnd - $RangeStart;
my $RangeZero = $DeltaRange - $RangeStart;
my $DeltaAngle = $AngleEnd - $AngleStart;
my $Coeff = $DeltaAngle / $DeltaRange;
$ScaledVal = ($Value - $RangeStart) * $Coeff;
$RealVal = $Value;
}
sub DrawLabel { # Draw a label at bottom of
+ meter
my($dc) = @_;
my($w, $h) = $dc->GetSizeWH();
my @te = $dc->GetTextExtent($Label);
my $x = ($w-$te[0])/2;
$dc->DrawText($Label, $x, $h-25);
}
