87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
// SPDX-FileCopyrightText: 2025 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
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// SPDX-License-Identifier: GPL-3.0-only
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#include "JFJochImage.h"
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#include <QScrollBar>
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#include <QWheelEvent>
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JFJochImage::JFJochImage(QWidget *parent) : QGraphicsView(parent) {
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setDragMode(QGraphicsView::NoDrag); // Disable default drag mode
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setTransformationAnchor(QGraphicsView::AnchorUnderMouse); // Zoom anchors
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setRenderHint(QPainter::Antialiasing); // Enable smooth rendering
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setRenderHint(QPainter::SmoothPixmapTransform);
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setFocusPolicy(Qt::ClickFocus);
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// Connect the horizontal scrollbar's valueChanged signal
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connect(horizontalScrollBar(), &QScrollBar::valueChanged, this, &JFJochImage::onScroll);
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// Connect the vertical scrollbar's valueChanged signal
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connect(verticalScrollBar(), &QScrollBar::valueChanged, this, &JFJochImage::onScroll);
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}
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void JFJochImage::onScroll(int value) {
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updateOverlay();
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}
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void JFJochImage::changeBackground(float val) {
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background = val;
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Redraw();
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}
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void JFJochImage::changeForeground(float val) {
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foreground = val;
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Redraw();
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}
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void JFJochImage::setColorMap(int color_map) {
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try {
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color_scale.Select(static_cast<ColorScaleEnum>(color_map));
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Redraw();
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} catch (...) {
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}
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}
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void JFJochImage::setFeatureColor(QColor input) {
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feature_color = input;
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Redraw();
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}
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void JFJochImage::wheelEvent(QWheelEvent *event) {
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if (!scene()) return;
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const double zoomFactor = 1.15; // Zoom factor
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// Get the position of the mouse in scene coordinates
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QPointF targetScenePos = mapToScene(event->position().toPoint());
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if (event->modifiers() == Qt::ShiftModifier) {
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float new_foreground = foreground + event->angleDelta().y() / 120.0f;
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if (new_foreground < 1)
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new_foreground = 1.0;
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foreground = new_foreground;
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emit foregroundChanged(foreground);
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Redraw();
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} else {
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// Perform zooming
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if (event->angleDelta().y() > 0) {
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if (scale_factor * zoomFactor < 500.0) {
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scale_factor *= zoomFactor;
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scale(zoomFactor, zoomFactor);
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}
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} else {
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if (scale_factor > 0.2) {
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scale_factor *= 1.0 / zoomFactor;
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scale(1.0 / zoomFactor, 1.0 / zoomFactor);
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}
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}
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// Adjust the view's center to keep the zoom focused on the mouse position
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QPointF updatedViewportCenter = mapToScene(viewport()->rect().center());
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QPointF delta = targetScenePos - updatedViewportCenter;
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translate(delta.x(), delta.y()); // Shift the view
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updateOverlay();
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}
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}
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