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minicanvas.cpp
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minicanvas.cpp
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#include "minicanvas.h"
#include "waterbased.h"
#include "maskbased.h"
#include "binarybrush.h"
#include "sketchbrush.h"
#include "basiceraser.h"
#include <QPainter>
#include <QMouseEvent>
#include <QtCore/qmath.h>
#include <QDebug>
MiniCanvas::MiniCanvas(QWidget *parent) :
QWidget(parent),
pre_size_(1280, 480),
result_(new QImage(pre_size_, QImage::Format_ARGB32_Premultiplied)),
mouse_press_(false),
tablet_press_(false)
{
setFocusPolicy(Qt::StrongFocus);
result_->fill(Qt::white);
brush_ = new BasicBrush;
brush_->setSurface(result_);
brush_->setColor(Qt::green);
brush_->setWidth(100);
brush_->setThickness(100);
}
QSize MiniCanvas::sizeHint() const
{
return pre_size_;
}
QSize MiniCanvas::minimumSizeHint() const
{
return pre_size_;
}
void MiniCanvas::paintEvent(QPaintEvent *)
{
QPainter painter(this);
painter.drawImage(0, 0, *result_.data());
}
void MiniCanvas::mousePressEvent(QMouseEvent *ev)
{
mouse_press_ = true;
brush_->drawPoint(ev->pos());
update();
}
void MiniCanvas::mouseMoveEvent(QMouseEvent *ev)
{
if(mouse_press_){
qDebug()<<"mouse event";
brush_->drawLineTo(ev->pos());
update();
}
}
void MiniCanvas::mouseReleaseEvent(QMouseEvent *)
{
mouse_press_ = false;
}
void MiniCanvas::tabletEvent(QTabletEvent *ev)
{
//TODO: fully support tablet
qreal pressure = ev->pressure();
QPoint pos = ev->pos();
qDebug()<<"pressure:"<<pressure<<"at"<<pos;
switch(ev->type()){
case QEvent::TabletPress:
brush_->drawPoint(ev->pos(), ev->pressure());
tablet_press_ = true;
update();
break;
case QEvent::TabletMove:
if(tablet_press_){
brush_->drawLineTo(ev->pos(), ev->pressure());
update();
}
break;
case QEvent::TabletRelease:
tablet_press_ = false;
// updateCursor();
break;
default:
break;
}
ev->accept();
}
void MiniCanvas::keyPressEvent(QKeyEvent *ev)
{
switch(ev->key()){
case Qt::Key_F1:
changeToBrush<BasicBrush>();
break;
case Qt::Key_F2:
changeToBrush<WaterBased>();
break;
case Qt::Key_F3:
changeToBrush<MaskBased>();
{
MaskBased* m = static_cast<MaskBased*>(brush_);
m->setMask(QImage(":/mask/canvas-print.png"));
}
break;
case Qt::Key_F4:
changeToBrush<BinaryBrush>();
break;
case Qt::Key_F5:
changeToBrush<SketchBrush>();
break;
case Qt::Key_F6:
changeToBrush<BasicEraser>();
break;
case Qt::Key_D:
result_->fill(Qt::white);
update();
break;
}
}
template<typename BrushType>
void MiniCanvas::changeToBrush()
{
if(std::is_base_of<AbstractBrush, BrushType>::value){
auto ss = brush_->settings();
auto surface = brush_->surface();
// NOTICE: since we're deleting base class, it needs virtual destructor!
delete brush_;
brush_ = new BrushType;
brush_->setSettings(ss);
brush_->setSurface(surface);
}else{
qCritical("Abnormal brush change!");
}
}