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#!/usr/bin/perl -w
use strict;
package DrawView;
use Qt;
use Qt::isa qw(Qt::Widget);
use Qt::slots
updateIt => ['int'],
printIt => [];
use Qt::attributes qw(
printer
bgroup
_print
drawindex
maxindex
);
#
# First we define the functionality our demo should present
# to the user. You might add different demo-modes if you wish so
#
#
# This function draws a color wheel.
# The coordinate system x=(0..500), y=(0..500) spans the paint device.
#
sub drawColorWheel {
my $p = shift;
my $f = Qt::Font("times", 18, &Qt::Font::Bold);
$p->setFont($f);
$p->setPen(&black);
$p->setWindow(0, 0, 500, 500); # defines coordinate system
for my $i (0..35) {
my $matrix = Qt::WMatrix;
$matrix->translate(250.0, 250.0); # move to center
$matrix->shear(0.0, 0.3); # twist it
$matrix->rotate($i*10.0); # rotate 0,10,20,.. degrees
$p->setWorldMatrix($matrix); # use this world matrix
my $c = Qt::Color;
$c->setHsv($i*10, 255, 255); # rainbow effect
$p->setBrush($c); # solid fill with color $c
$p->drawRect(70, -10, 80, 10); # draw the rectangle
my $n = sprintf "H=%d", $i*10;
$p->drawText(80+70+5, 0, $n); # draw the hue number
}
}
#
# This function draws a few lines of text using different fonts.
#
sub drawFonts {
my $p = shift;
my @fonts = qw(Helvetica Courier Times);
my @sizes = (10, 12, 18, 24, 36);
my $y = 0;
for my $f (@fonts) {
for my $s (@sizes) {
my $font = Qt::Font($f, $s);
$p->setFont($font);
my $fm = $p->fontMetrics;
$y += $fm->ascent;
$p->drawText(10, $y, "Quartz Glyph Job Vex'd Cwm Finks");
$y += $fm->descent;
}
}
}
#
# This function draws some shapes
#
sub drawShapes {
my $p = shift;
my $b1 = Qt::Brush(&blue);
my $b2 = Qt::Brush(&green, &Dense6Pattern); # green 12% fill
my $b3 = Qt::Brush(&NoBrush); # void brush
my $b4 = Qt::Brush(&CrossPattern); # black cross pattern
$p->setPen(&red);
$p->setBrush($b1);
$p->drawRect(10, 10, 200, 100);
$p->setBrush($b2);
$p->drawRoundRect(10, 150, 200, 100, 20, 20);
$p->setBrush($b3);
$p->drawEllipse(250, 10, 200, 100);
$p->setBrush($b4);
$p->drawPie(250, 150, 200, 100, 45*16, 90*16);
}
our @drawFunctions = (
# title presented to user, reference to the function
{ name => "Draw color wheel", f => \&drawColorWheel },
{ name => "Draw fonts" , f => \&drawFonts },
{ name => "Draw shapes" , f => \&drawShapes },
);
#
# Construct the DrawView with buttons.
#
sub NEW {
shift->SUPER::NEW(@_);
setCaption("PerlQt Draw Demo Application");
setBackgroundColor(&white);
# Create a button group to contain all buttons
bgroup = Qt::ButtonGroup(this);
bgroup->resize(200, 200);
this->connect(bgroup, SIGNAL('clicked(int)'), SLOT('updateIt(int)'));
# Calculate the size for the radio buttons
my $maxwidth = 80;
my $maxheight = 10;
my $fm = bgroup->fontMetrics;
for my $i (0 .. $#drawFunctions) {
my $n = $drawFunctions[$i]{name};
my $w = $fm->width($n);
$maxwidth = max($w, $maxwidth);
}
$maxwidth += 30;
for my $i (0 .. $#drawFunctions) {
my $n = $drawFunctions[$i]{name};
my $rb = Qt::RadioButton($n, bgroup);
$rb->setGeometry(10, $i*30+10, $maxwidth, 30);
$maxheight += 30;
$rb->setChecked(1) unless $i;
$i++;
}
$maxheight += 10;
drawindex = 0;
maxindex = scalar @drawFunctions;
$maxwidth += 20;
bgroup->resize($maxwidth, $maxheight);
printer = Qt::Printer;
_print = Qt::PushButton("Print...", bgroup);
_print->resize(80, 30);
_print->move($maxwidth/2 - _print->width/2, maxindex*30+20);
this->connect(_print, SIGNAL('clicked()'), SLOT('printIt()'));
bgroup->resize($maxwidth, _print->y+_print->height+10);
resize(640,300);
}
sub updateIt {
my $index = shift;
if($index < maxindex) {
drawindex = $index;
update();
}
}
sub drawIt {
my $p = shift;
$drawFunctions[drawindex]{f}->($p);
}
sub printIt {
if(printer->setup(this)) {
my $paint = Qt::Painter(printer);
drawIt($paint);
}
}
sub paintEvent {
my $paint = Qt::Painter(this);
drawIt($paint);
}
sub resizeEvent {
bgroup->move(int(width() - bgroup->width), int(0));
}
package main;
use Qt;
use DrawView;
my $app = Qt::Application(\@ARGV);
my $draw = DrawView;
$app->setMainWidget($draw);
$draw->setCaption("PerlQt Example - Drawdemo");
$draw->show;
exit $app->exec;
|
