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|
package RenderArea;
use strict;
use warnings;
use QtCore4;
use QtGui4;
# [0]
use constant {
NoTransformation => 0,
Translate => 1,
Rotate => 2,
Scale => 3
};
# [0]
# [1]
use QtCore4::isa qw( Qt::Widget );
# [1]
# [2]
sub operations() {
return this->{operations};
}
sub shape() {
return this->{shape};
}
sub xBoundingRect() {
return this->{xBoundingRect};
}
sub yBoundingRect() {
return this->{yBoundingRect};
}
# [2]
# [0]
sub NEW
{
my ($class, $parent) = @_;
$class->SUPER::NEW($parent);
my $newFont = this->font();
$newFont->setPixelSize(12);
this->setFont($newFont);
my $fontMetrics = Qt::FontMetrics($newFont);
this->{xBoundingRect} = $fontMetrics->boundingRect(this->tr('x'));
this->{yBoundingRect} = $fontMetrics->boundingRect(this->tr('y'));
this->{operations} = [];
}
# [0]
# [1]
sub setOperations
{
my ($operations) = @_;
# Make sure to copy the array
this->{operations} = [@{$operations}];
this->update();
}
# [1]
# [2]
sub setShape
{
my ($shape) = @_;
this->{shape} = $shape;
this->update();
}
# [2]
# [3]
sub minimumSizeHint
{
return Qt::Size(182, 182);
}
# [3]
# [4]
sub sizeHint
{
return Qt::Size(232, 232);
}
# [4]
# [5]
sub paintEvent
{
my ($event) = @_;
my $painter = Qt::Painter(this);
$painter->setRenderHint(Qt::Painter::Antialiasing());
$painter->fillRect($event->rect(), Qt::Brush(Qt::white()));
$painter->translate(66, 66);
# [5]
# [6]
$painter->save();
this->transformPainter($painter);
this->drawShape($painter);
$painter->restore();
# [6]
# [7]
this->drawOutline($painter);
# [7]
# [8]
this->transformPainter($painter);
this->drawCoordinates($painter);
$painter->end();
}
# [8]
# [9]
sub drawCoordinates
{
my ($painter) = @_;
$painter->setPen(Qt::Color(Qt::red()));
$painter->drawLine(0, 0, 50, 0);
$painter->drawLine(48, -2, 50, 0);
$painter->drawLine(48, 2, 50, 0);
$painter->drawText(60 - this->xBoundingRect->width() / 2,
0 + this->xBoundingRect->height() / 2, this->tr('x'));
$painter->drawLine(0, 0, 0, 50);
$painter->drawLine(-2, 48, 0, 50);
$painter->drawLine(2, 48, 0, 50);
$painter->drawText(0 - this->yBoundingRect->width() / 2,
60 + this->yBoundingRect->height() / 2, this->tr('y'));
}
# [9]
# [10]
sub drawOutline
{
my ($painter) = @_;
$painter->setPen(Qt::darkGreen());
$painter->setPen(Qt::DashLine());
$painter->setBrush(Qt::NoBrush());
$painter->drawRect(0, 0, 100, 100);
}
# [10]
# [11]
sub drawShape
{
my ($painter) = @_;
$painter->fillPath(this->shape, Qt::Brush(Qt::blue()));
}
# [11]
# [12]
sub transformPainter
{
my ($painter) = @_;
foreach my $operation( @{this->operations} ) {
if ( $operation == Translate ) {
$painter->translate(50, 50);
}
elsif ( $operation == Scale ) {
$painter->scale(0.75, 0.75);
}
elsif ( $operation == Rotate ) {
$painter->rotate(60);
}
}
}
# [12]
1;
|
