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imageviewer.cpp
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imageviewer.cpp
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#include "imageviewer.h"
#include "label/imagelabel.h"
#include "types.h"
#include <QApplication>
#include <QDebug>
#include <QFontMetrics>
#include <QKeyEvent>
#include <QMenu>
#include <QPainter>
#include <limits>
#include <cmath>
ImageViewer::ImageViewer(QWidget *parent)
: QWidget{parent} {
setMouseTracking(true);
setBackgroundRole(QPalette::Mid);
setAutoFillBackground(true);
setFocusPolicy(Qt::ClickFocus);
mBackground = QImage(":/mask.png");
}
void ImageViewer::paintEvent(QPaintEvent *event) {
Q_UNUSED(event)
QPainter painter(this);
painter.fillRect(rect(), QBrush(mBackground));
painter.save();
PaintInfo info;
info.painter = &painter;
info.size = mImageLabel ? mImageLabel->image().size() : QSizeF{0, 0};
info.worldScale = getWorldScale();
info.offset = mImageOriginOffset;
// render image with half pixel offset
QTransform halfPixel;
halfPixel.translate(mImageOriginOffset.x(), mImageOriginOffset.y());
painter.setTransform(halfPixel * getWorldTransform());
if (mImageLabel && mImageLabel->category()->visible()) {
mImageLabel->onPaint(info);
}
// Setup world transform matrix
painter.setTransform(getWorldTransform());
painter.setRenderHint(QPainter::Antialiasing);
foreach (auto &label, mLabels) {
if (!label->category()->visible()) {
continue;
}
label->onPaint(info);
}
foreach (auto &editor, mEditors) {
if (!editor->category()->visible()) {
continue;
}
editor->onPaint(info);
}
painter.restore();
displayInfo(painter);
}
void ImageViewer::mousePressEvent(QMouseEvent *event) {
setMousePos(event);
if (event->button() != Qt::LeftButton || QApplication::keyboardModifiers() != Qt::NoModifier) {
return;
}
if (mInPixelSelect) {
auto pos = mMousePos.toPoint();
if (!mImageLabel || mImageLabel->image().isNull()) {
mSelectedColor = QColor();
} else {
// check valid position
const auto &img = mImageLabel->image();
if (pos.x() >= 0 && pos.x() < img.width() && pos.y() >= 0 && pos.y() < img.height()) {
mSelectedColor = img.pixelColor(pos);
} else {
mSelectedColor = QColor();
}
}
emit pixelValueChanged(pos, mSelectedColor);
} else {
if (mSelectedEditor && mSelectedEditor->isCreation()) {
mSelectedEditor->select(mMousePos);
update();
return;
}
auto pos = mMousePos;
mSelectedEditor.reset();
for (auto i = mEditors.size() - 1; i >= 0; i--) {
auto &editor = mEditors[ i ];
if (editor->category()->visible() && editor->select(pos)) {
mSelectedEditor = editor;
// unselect other label
pos.setX(std::numeric_limits<float>::max());
}
}
}
update();
}
void ImageViewer::mouseReleaseEvent(QMouseEvent *event) {
setMousePos(event);
if (!mSelectedEditor) {
return;
}
if (event->button() == Qt::LeftButton) {
mSelectedEditor->release();
} else if (event->button() == Qt::RightButton) {
// modify
mSelectedEditor->modify(mMousePos);
}
update();
}
void ImageViewer::mouseMoveEvent(QMouseEvent *event) {
auto oldMousePos = mMousePos;
setMousePos(event);
auto oldPos = mMousePosPixels;
mMousePosPixels = event->pos();
// highlight
if (event->buttons() == Qt::NoButton) {
foreach (auto editor, mEditors) {
if (!editor->category()->visible()) {
continue;
}
editor->moving(mMousePos, oldMousePos);
}
}
if (mSelectedEditor && (event->buttons() & Qt::LeftButton)) {
mSelectedEditor->moving(mMousePos, oldMousePos);
update();
return;
}
if ((event->buttons() & Qt::MiddleButton) || (event->buttons() & Qt::LeftButton)) {
auto delta = oldPos - mMousePosPixels;
mWorldOffset -= QPointF(delta.x() / mWorldScale, delta.y() / mWorldScale);
mFitToViewOnResize = false;
}
update();
}
void ImageViewer::wheelEvent(QWheelEvent *event) {
if (mSelectedEditor && QApplication::keyboardModifiers() == Qt::NoModifier) {
auto delta = event->angleDelta().y() / 128.;
mSelectedEditor->rotate(delta);
update();
return;
}
if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
double scale = mWorldScale * pow(mScaleFactor, event->angleDelta().y() / 240.);
auto oldWorldScale = mWorldScale;
setWorldScale(scale);
auto deltaX =
(mWorldOffset.x() * oldWorldScale + mMousePos.x() * (oldWorldScale - mWorldScale)) /
mWorldScale;
auto deltaY =
(mWorldOffset.y() * oldWorldScale + mMousePos.y() * (oldWorldScale - mWorldScale)) /
mWorldScale;
mWorldOffset.setX(deltaX);
mWorldOffset.setY(deltaY);
mFitToViewOnResize = false;
}
update();
}
void ImageViewer::keyPressEvent(QKeyEvent *event) {
if (event->key() == Qt::Key_Delete) {
if (!mSelectedEditor) {
return;
}
mEditors.removeAll(mSelectedEditor);
mSelectedEditor.reset();
}
update();
}
void ImageViewer::resizeEvent(QResizeEvent *event) {
if (mFitToViewOnResize) {
fitToView();
}
QWidget::resizeEvent(event);
}
void ImageViewer::resetWorldTransform() {
setWorldScale(1.0);
mWorldOffset = {0, 0};
}
void ImageViewer::setWorldScaleAndUpdate(double value) {
auto oldWorldScale = mWorldScale;
auto centerPos = getWorldTransform().inverted().map(QPointF(width() / 2., height() / 2.));
setWorldScale(value);
const auto deltaX =
(mWorldOffset.x() * oldWorldScale + centerPos.x() * (oldWorldScale - mWorldScale)) /
mWorldScale;
const auto deltaY =
(mWorldOffset.y() * oldWorldScale + centerPos.y() * (oldWorldScale - mWorldScale)) /
mWorldScale;
mWorldOffset.setX(deltaX);
mWorldOffset.setY(deltaY);
mFitToViewOnResize = false;
update();
}
void ImageViewer::zoomIn() {
setWorldScaleAndUpdate(getWorldScale() + mScaleStep);
}
void ImageViewer::zoomOut() {
setWorldScaleAndUpdate(getWorldScale() - mScaleStep);
}
void ImageViewer::fitToView() {
if (!mImageLabel || mImageLabel->image().isNull()) {
resetWorldTransform();
} else {
const auto &img = mImageLabel->image();
auto scaleX = double(width()) / img.width();
auto scaleY = double(height()) / img.height();
setWorldScale(std::min(scaleX, scaleY));
mWorldOffset = {(width() / mWorldScale - img.width()) / 2,
(height() / mWorldScale - img.height()) / 2};
}
mFitToViewOnResize = true;
update();
}
void ImageViewer::resetToOriginalSize() {
setWorldScaleAndUpdate(1.0);
}
QTransform ImageViewer::getWorldTransform() const {
QTransform scale;
QTransform translate;
scale.scale(mWorldScale, mWorldScale);
translate.translate(mWorldOffset.x(), mWorldOffset.y());
return translate * scale;
}
void ImageViewer::setWorldScale(double value) {
if (mMaxScale <= value || mMinScale >= value) {
return;
}
mWorldScale = value;
emit scaleFactorChanged(mWorldScale);
}
double ImageViewer::getWorldScale() const {
return mWorldScale;
}
QPointF ImageViewer::getMousePos() {
return mMousePos;
}
void ImageViewer::setMousePos(QMouseEvent *event) {
mMousePos = getWorldTransform().inverted().map(QPointF(event->pos()));
}
void ImageViewer::displayInfo(QPainter &painter) {
painter.save();
QImage empty;
const auto &img =
(mImageLabel && !mImageLabel->image().isNull()) ? mImageLabel->image() : empty;
auto str1 = (img.isNull() ? "" : QString("%1x%2 ").arg(img.width()).arg(img.height())) +
QString::number(mWorldScale * 100.f, 'f', 2) + "%";
auto str2 = QString("%1,%2").arg(mMousePos.x()).arg(mMousePos.y());
auto str3 = img.format() != QImage::Format_Grayscale8
? QString("R:%1,G:%2,B:%3")
.arg(mSelectedColor.red())
.arg(mSelectedColor.green())
.arg(mSelectedColor.blue())
: QString("L:%1").arg(mSelectedColor.lightness());
QFontMetrics fm(painter.font());
#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
int width1 = fm.boundingRect(str1).width();
int width2 = fm.boundingRect(str2).width();
int width3 = fm.boundingRect(str3).width();
#else
int width1 = fm.width(str1);
int width2 = fm.width(str2);
int width3 = fm.width(str3);
#endif
int height1 = fm.height();
int width = width1 > width2 ? width1 : width2;
int height = height1 * 2;
if (mInPixelSelect) {
width = width > width3 ? width : width3;
height = height1 * 3;
}
painter.setPen(QPen(Qt::transparent));
painter.setBrush(QColor(35, 35, 35, 100));
painter.drawRect(QRect(0, 0, width + 5, height + 5));
painter.setPen(QPen(QColor(150, 250, 150)));
painter.drawText(2, height1, str1);
painter.drawText(2, height1 * 2, str2);
if (mInPixelSelect) {
painter.drawText(2, height1 * 3, str3);
}
painter.restore();
}
void ImageViewer::loadImage(const QString &filepath) {
const QImage img(filepath);
setImage(img);
}
void ImageViewer::setImage(const QImage &img_) {
if (img_.isNull()) {
return;
}
mImageLabel.reset(new ImageLabel);
mImageLabel->setImage(img_);
emit imageSizeChanged(img_.size());
if (mFitToViewOnLoad) {
fitToView();
}
update();
}
QImage ImageViewer::image() const {
if (!mImageLabel || mImageLabel->image().isNull()) {
return {};
}
return mImageLabel->image();
}
QImage ImageViewer::rendering() const {
if (!mImageLabel || mImageLabel->image().isNull()) {
return {};
}
auto &img = mImageLabel->image();
QPixmap target = QPixmap::fromImage(img, Qt::ColorOnly);
QPainter painter(&target);
PaintInfo info;
info.painter = &painter;
info.worldScale = 1.;
info.size = img.size();
info.offset = {0, 0};
foreach (auto &label, mLabels) {
if (!label->category()->visible()) {
continue;
}
label->onPaint(info);
}
foreach (auto &editor, mEditors) {
if (!editor->category()->visible()) {
continue;
}
editor->onPaint(info);
}
return target.toImage();
}
void ImageViewer::addLabel(const QSharedPointer<Label> &label) {
if (!label) {
return;
}
auto imageLabel = label.dynamicCast<ImageLabel>();
if (imageLabel) {
mImageLabel = imageLabel;
} else {
mLabels.append(label);
}
update();
}
void ImageViewer::removeLabel(const QSharedPointer<Label> &label) {
mLabels.removeAll(label);
if (mImageLabel == label) {
mImageLabel.reset();
}
update();
}
void ImageViewer::clearLabel() {
mLabels.clear();
mImageLabel.reset();
update();
}
void ImageViewer::addEditor(const QSharedPointer<LabelEditor> &editor) {
if (!editor) {
return;
}
mEditors.append(editor);
if (editor->isCreation()) {
mSelectedEditor = editor;
}
update();
}
void ImageViewer::removeEditor(const QSharedPointer<LabelEditor> &editor) {
mEditors.removeAll(editor);
mSelectedEditor.reset();
update();
}
void ImageViewer::clearEditor() {
mEditors.clear();
mSelectedEditor.reset();
update();
}
void ImageViewer::setInSelect(bool pixelSelect) {
mInPixelSelect = pixelSelect;
}