基于Qt QGraphicsView的简易画图软件.zip

#include "UICanvasItemBase.h" #include "Utils.h" #include <QPainter> #include <QGraphicsSceneMouseEvent> #include <QDebug> #include <QGraphicsView> #include <QGraphicsScene> #include <QVector2D> #include <QVector3D> #include <cmath> #include <math.h> #include <QJsonObject> #include "NDNodeBase.h" #include "NDAttributeBase.h" #include "NDRealAttribute.h" #include "NDIntAttribute.h" #include "RALLBlockSignal.h" #include "UICanvasItemManager.h" #include "UICanvasView.h" QImage UICanvasItemBase::m_closeIcon; QImage UICanvasItemBase::m_resizeIcon; QImage UICanvasItemBase::m_rotateIcon; UICanvasItemBase::UICanvasItemBase(QGraphicsItem* parentItem) :QGraphicsItem(parentItem) ,m_cPenColor(255, 0, 0) ,m_cBrushColor(200, 100, 100) { this->setFlag(QGraphicsItem::ItemIsSelectable, true); this->setFlag(QGraphicsItem::ItemSendsGeometryChanges, true); initIcon(); // 初始化基本属性 initNodeBase(); // 获取中心位置 m_size = QSize(100, 100); QPointF centerPos = g_currentCanvasManager->getCurrentCanvasView()->getCenterPos(); this->setPos(centerPos); } UICanvasItemBase::~UICanvasItemBase() { } void UICanvasItemBase::setItemResizeable(bool resizeable) { m_isResizeable = resizeable; } NDNodeBase* UICanvasItemBase::getCurrentNode(void) const { return m_pNode; } void UICanvasItemBase::setItemResizeRatio(bool resizeRation, qreal rationValue) { m_isRatioScale = resizeRation; m_ratioValue = rationValue; } QRectF UICanvasItemBase::boundingRect() const { QRectF rectF = getCustomRect(); if (!this->isSelected()) return rectF; rectF.adjust(-m_nInterval, -m_nInterval, m_nInterval, m_nInterval); rectF.adjust(-m_nEllipseWidth, -m_nEllipseWidth, m_nEllipseWidth, m_nEllipseWidth); return rectF; } void UICanvasItemBase::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) { painter->setRenderHint(QPainter::Antialiasing, true); painter->setRenderHint(QPainter::SmoothPixmapTransform, true); painter->setRenderHint(QPainter::TextAntialiasing, true); // 自定义绘制 customPaint(painter, option, widget); if (!this->isSelected()) return; // 设置画笔 QPen pen; pen.setWidth(m_nPenWidth); pen.setColor(m_cPenColor); pen.setStyle(Qt::DashLine); painter->setPen(pen); QRectF itemRect = this->getCustomRect(); // 绘制轮廓线 QRectF outLintRect = itemRect.adjusted(-m_nInterval, -m_nInterval, m_nInterval, m_nInterval); painter->drawRect(outLintRect); painter->setPen(Qt::NoPen); painter->setBrush(m_cBrushColor); // 绘制控制点 painter->drawEllipse(outLintRect.topRight(), m_nEllipseWidth, m_nEllipseWidth); if (!m_closePixmap.isNull()) painter->drawPixmap(QRect(outLintRect.topRight().x() - m_nEllipseWidth / 2, \ outLintRect.topRight().y() - m_nEllipseWidth / 2, \ m_nEllipseWidth, m_nEllipseWidth), m_closePixmap); painter->drawEllipse(outLintRect.bottomLeft(), m_nEllipseWidth, m_nEllipseWidth); if (!m_rotatePixmap.isNull()) painter->drawPixmap(QRect(outLintRect.bottomLeft().x() - m_nEllipseWidth / 2, \ outLintRect.bottomLeft().y() - m_nEllipseWidth / 2, \ m_nEllipseWidth, m_nEllipseWidth), m_rotatePixmap); if (m_isResizeable) { painter->drawEllipse(outLintRect.bottomRight(), m_nEllipseWidth, m_nEllipseWidth); if (!m_resizePixmap.isNull()) painter->drawPixmap(QRect(outLintRect.bottomRight().x() - m_nEllipseWidth / 2, \ outLintRect.bottomRight().y() - m_nEllipseWidth / 2, \ m_nEllipseWidth, m_nEllipseWidth), m_resizePixmap); } } QPainterPath UICanvasItemBase::shape() const { QPainterPath path; path.addRect(boundingRect()); return path; } void UICanvasItemBase::mousePressEvent(QGraphicsSceneMouseEvent *event) { QRectF itemRect = this->getCustomRect(); QRectF outLintRect = itemRect.adjusted(-m_nInterval, -m_nInterval, m_nInterval, m_nInterval); // 获取当前模式 QPointF pos = event->pos(); QPointF scenePos = event->scenePos(); if (itemRect.contains(pos)) m_itemOper = t_move; else if (g_utilTool->getDistance(pos, outLintRect.topRight()) <= m_nEllipseWidth) { g_currentCanvasManager->deleteCanvasItem(m_pNode); return; } else if (g_utilTool->getDistance(pos, outLintRect.bottomLeft()) <= m_nEllipseWidth) m_itemOper = t_rotate; else if (g_utilTool->getDistance(pos, outLintRect.bottomRight()) <= m_nEllipseWidth) m_itemOper = t_resize; // 保存当前的一些信息 m_pos = pos; m_pressedPos = scenePos; m_startPos = this->pos(); m_startRotate = m_rotate; m_startSize = m_size; return QGraphicsItem::mousePressEvent(event); } void UICanvasItemBase::mouseMoveEvent(QGraphicsSceneMouseEvent *event) { // 获取场景坐标和本地坐标 QPointF scenePos = event->scenePos(); QPointF pos = event->pos(); if (m_itemOper == t_move) { // 处理移动 mouseMoveMoveOperator(scenePos, pos); } else if (m_itemOper == t_resize) { // 处理更改大小 mouseMoveResizeOperator(scenePos, pos); } else if (m_itemOper == t_rotate) { // 处理旋转 mouseMoveRotateOperator(scenePos, pos); } return QGraphicsItem::mouseMoveEvent(event); } void UICanvasItemBase::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) { // 获取场景坐标和本地坐标 QPointF scenePos = event->scenePos(); QPointF pos = event->pos(); if (m_itemOper == t_move) { // 处理移动 mouseReleaseMoveOperator(scenePos, pos); } else if (m_itemOper == t_resize) { // 处理更改大小 mouseReleaseResizeOperator(scenePos, pos); } else if (m_itemOper == t_rotate) { // 处理旋转 mouseReleaseRotateOperator(scenePos, pos); } m_itemOper = t_none; return QGraphicsItem::mouseReleaseEvent(event); } QVariant UICanvasItemBase::itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value) { if (change == QGraphicsItem::ItemSelectedChange) prepareGeometryChange(); else if (change == QGraphicsItem::ItemPositionHasChanged) { updateAttribute(); } return QGraphicsItem::itemChange(change, value); } void UICanvasItemBase::mouseMoveMoveOperator(const QPointF& scenePos, const QPointF& loacalPos) { qreal xInterval = scenePos.x() - m_pressedPos.x(); qreal yInterval = scenePos.y() - m_pressedPos.y(); this->setPos(m_startPos + QPointF(xInterval, yInterval)); this->update(); } void UICanvasItemBase::mouseMoveResizeOperator(const QPointF& scenePos, const QPointF& loacalPos) { if (!m_isResizeable) return; qreal ratio = m_ratioValue; qreal itemWidth = abs(loacalPos.x()) * 2 - m_nInterval - m_nEllipseWidth; qreal itemHeight = abs(loacalPos.y()) * 2 - m_nInterval - m_nEllipseWidth; if (m_isRatioScale) itemHeight = itemWidth * 1.0 / ratio; // 设置图片的最小大小为10 if (itemWidth < 10 || itemHeight < 10) return; m_size = QSize(itemWidth, itemHeight); m_pWidthAttribute->setValue(m_size.width()); m_pHeightAttribute->setValue(m_size.height()); this->update(); } void UICanvasItemBase::mouseMoveRotateOperator(const QPointF& scenePos, const QPointF& loacalPos) { // 获取并设置为单位向量 QVector2D startVec(m_pos.x() - 0, m_pos.y() - 0); startVec.normalize(); QVector2D endVec(loacalPos.x() - 0, loacalPos.y() - 0); endVec.normalize(); // 单位向量点乘，计算角度 qreal dotValue = QVector2D::dotProduct(startVec, endVec); if (dotValue > 1.0) d