paysages3d/gui_qt/basepreview.cpp

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#include "basepreview.h"
#include <math.h>
#include <QVector>
#include <QPainter>
#include <QTimer>
#include <QWheelEvent>
class PreviewDrawer:public QThread
{
public:
PreviewDrawer(BasePreview* preview):
QThread(),
_preview(preview)
{
_running = false;
}
void askStop()
{
_running = false;
}
static inline void usleep(int us)
{
QThread::usleep(us);
}
protected:
void run()
{
_running = true;
while (_running)
{
_preview->doRender();
QThread::usleep(50000);
}
}
private:
BasePreview* _preview;
bool _running;
};
BasePreview::BasePreview(QWidget* parent) :
QWidget(parent)
{
this->lock_drawing = new QMutex();
this->conf_scroll_xmin = 0.0;
this->conf_scroll_xmax = 0.0;
this->conf_scroll_xinit = 0.0;
this->conf_scroll_ymin = 0.0;
this->conf_scroll_ymax = 0.0;
this->conf_scroll_yinit = 0.0;
this->conf_scale_min = 1.0;
this->conf_scale_max = 1.0;
this->conf_scale_init = 1.0;
this->conf_scale_step = 0.0;
this->conf_scroll_logarithmic = false;
this->scaling = 1.0;
this->scalingbase = 1.0;
this->xoffset = 0.0;
this->yoffset = 0.0;
this->pixbuf = new QImage(this->size(), QImage::Format_ARGB32);
this->pixbuf->fill(0x00000000);
this->alive = true;
this->need_restart = false;
this->need_render = true;
QObject::connect(this, SIGNAL(contentChange()), this, SLOT(update()));
QObject::connect(this, SIGNAL(redrawRequested()), this, SLOT(handleRedraw()));
this->setMinimumSize(256, 256);
this->setMaximumSize(256, 256);
this->resize(256, 256);
this->updater = new PreviewDrawer(this);
}
BasePreview::~BasePreview()
{
alive = false;
((PreviewDrawer*)updater)->askStop();
updater->wait();
delete updater;
delete pixbuf;
delete lock_drawing;
}
void BasePreview::updateData()
{
}
QColor BasePreview::getColor(double x, double y)
{
return QColor(0, 0, 0);
}
void BasePreview::configScaling(double min, double max, double step, double init, bool logarithmic)
{
double size = (double)width();
if (size >= 1.0)
{
conf_scale_min = min / size;
conf_scale_max = max / size;
conf_scale_step = step / size;
conf_scale_init = init / size;
conf_scroll_logarithmic = logarithmic;
scalingbase = init / size;
if (conf_scroll_logarithmic && conf_scale_max - conf_scale_min > 0.0000001)
{
scalingbase = pow((scalingbase - conf_scale_min) / (conf_scale_max - conf_scale_min), 0.5) * (conf_scale_max - conf_scale_min) + conf_scale_min;
}
updateScaling();
redraw();
}
}
void BasePreview::configScrolling(double xmin, double xmax, double xinit, double ymin, double ymax, double yinit)
{
conf_scroll_xmin = xmin;
conf_scroll_xmax = xmax;
conf_scroll_xinit = xinit;
conf_scroll_ymin = ymin;
conf_scroll_ymax = ymax;
conf_scroll_yinit = yinit;
xoffset = xinit;
yoffset = yinit;
redraw();
}
void BasePreview::start()
{
this->updater->start();
}
void BasePreview::doRender()
{
if (this->alive)
{
if (this->need_render)
{
this->need_render = false;
this->renderPixbuf();
emit contentChange();
}
}
}
void BasePreview::redraw()
{
emit(redrawRequested());
}
void BasePreview::handleRedraw()
{
lock_drawing->lock();
updateData();
QImage part = pixbuf->copy();
pixbuf->fill(0x00000000);
QPainter painter(pixbuf);
painter.setOpacity(0.99);
painter.drawImage(0, 0, part);
need_render = true;
need_restart = true;
lock_drawing->unlock();
}
void BasePreview::resizeEvent(QResizeEvent* event)
{
QImage* image;
this->lock_drawing->lock();
image = this->pixbuf;
this->pixbuf = new QImage(this->size(), QImage::Format_ARGB32);
this->pixbuf->fill(0x00000000);
this->need_render = true;
this->need_restart = true;
delete image;
this->lock_drawing->unlock();
}
void BasePreview::paintEvent(QPaintEvent* event)
{
QPainter painter(this);
painter.drawImage(0, 0, *this->pixbuf);
}
void BasePreview::renderPixbuf()
{
QColor col;
bool done;
int x, y, w, h;
w = this->pixbuf->width();
h = this->pixbuf->height();
this->need_restart = false;
for (x = 0; x < w; x++)
{
this->lock_drawing->lock();
if (this->need_restart || !this->alive)
{
this->lock_drawing->unlock();
return;
}
done = false;
for (y = 0; y < h; y++)
{
if (this->need_restart || !this->alive)
{
this->lock_drawing->unlock();
return;
}
if (qAlpha(this->pixbuf->pixel(x, y)) < 255)
{
col = this->getColor((double)(x - w / 2) * this->scaling + this->xoffset, (double)(y - h / 2) * this->scaling + this->yoffset);
col.setAlpha(255);
this->pixbuf->setPixel(x, y, col.rgb());
done = true;
}
}
if (done && (x == w - 1 || x % 10 == 0))
{
emit contentChange();
}
this->lock_drawing->unlock();
PreviewDrawer::usleep(100);
}
}
void BasePreview::updateScaling()
{
if (conf_scroll_logarithmic && conf_scale_max - conf_scale_min > 0.0000001)
{
scaling = pow((scalingbase - conf_scale_min) / (conf_scale_max - conf_scale_min), 2.0) * (conf_scale_max - conf_scale_min) + conf_scale_min;
}
else
{
scaling = scalingbase;
}
}
void BasePreview::mousePressEvent(QMouseEvent* event)
{
if (event->button() == Qt::LeftButton)
{
mousex = event->x();
mousey = event->y();
}
}
void BasePreview::mouseMoveEvent(QMouseEvent* event)
{
int dx, dy;
int ndx, ndy;
int width, height;
if (event->buttons() & Qt::LeftButton)
{
dx = event->x() - mousex;
dy = event->y() - mousey;
ndx = dx;
ndy = dy;
if (xoffset - dx * scaling > conf_scroll_xmax)
{
ndx = (int)floor((conf_scroll_xmax - xoffset) / scaling);
}
if (xoffset - dx * scaling < conf_scroll_xmin)
{
ndx = (int)floor((conf_scroll_xmin - xoffset) / scaling);
}
if (yoffset - dy * scaling > conf_scroll_ymax)
{
ndy = (int)floor((conf_scroll_ymax - yoffset) / scaling);
}
if (yoffset - dy * scaling < conf_scroll_ymin)
{
ndy = (int)floor((conf_scroll_ymin - yoffset) / scaling);
}
if (ndx != 0 || ndy != 0)
{
width = this->width();
height = this->height();
if (ndx <= -width || ndx >= width || ndy <= -height || ndy >= height)
{
xoffset -= (double)ndx * scaling;
yoffset -= (double)ndy * scaling;
lock_drawing->lock();
pixbuf->fill(0x00000000);
need_render = true;
lock_drawing->unlock();
}
else
{
int xstart, xsize, ystart, ysize;
lock_drawing->lock();
xoffset -= (double)ndx * scaling;
yoffset -= (double)ndy * scaling;
if (ndx < 0)
{
xstart = -ndx;
xsize = width + ndx;
}
else
{
xstart = 0;
xsize = width - ndx;
}
if (ndy < 0)
{
ystart = -ndy;
ysize = height + ndy;
}
else
{
ystart = 0;
ysize = height - ndy;
}
QImage part = pixbuf->copy(xstart, ystart, xsize, ysize);
QPainter painter(pixbuf);
pixbuf->fill(0x00000000);
painter.drawImage(xstart + ndx, ystart + ndy, part);
need_render = true;
lock_drawing->unlock();
emit contentChange();
}
}
mousex = event->x();
mousey = event->y();
}
}
void BasePreview::wheelEvent(QWheelEvent* event)
{
double factor;
double old_scaling;
int width, height;
int new_width, new_height;
if (event->modifiers() & Qt::ShiftModifier)
{
factor = 5.0;
}
else if (event->modifiers() & Qt::ControlModifier)
{
factor = 0.2;
}
else
{
factor = 1.0;
}
if (event->orientation() == Qt::Vertical)
{
if (event->delta() > 0 && scalingbase > conf_scale_min)
{
scalingbase -= factor * conf_scale_step;
if (scalingbase < conf_scale_min)
{
scalingbase = conf_scale_min;
}
}
else if (event->delta() < 0 && scalingbase < conf_scale_max)
{
scalingbase += factor * conf_scale_step;
if (scalingbase > conf_scale_max)
{
scalingbase = conf_scale_max;
}
}
else
{
event->ignore();
return;
}
}
else
{
event->ignore();
return;
}
old_scaling = scaling;
updateScaling();
width = pixbuf->width();
height = pixbuf->height();
if (scaling < old_scaling)
{
lock_drawing->lock();
new_width = (int)floor(((double)width) * scaling / old_scaling);
new_height = (int)floor(((double)height) * scaling / old_scaling);
QImage part = pixbuf->copy((width - new_width) / 2, (height - new_height) / 2, new_width, new_height).scaled(width, height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
QPainter painter(pixbuf);
pixbuf->fill(0x00000000);
painter.setOpacity(0.99);
painter.drawImage(0, 0, part);
need_render = true;
lock_drawing->unlock();
emit contentChange();
}
else if (scaling > old_scaling)
{
lock_drawing->lock();
QImage part = pixbuf->scaled((int)floor(((double)width) * old_scaling / scaling), (int)floor(((double)height) * old_scaling / scaling), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
QPainter painter(pixbuf);
pixbuf->fill(0x00000000);
painter.setOpacity(0.99);
painter.drawImage((width - part.width()) / 2, (height - part.height()) / 2, part);
need_render = true;
lock_drawing->unlock();
emit contentChange();
}
event->accept();
}