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https://gitee.com/drabel/LibQQt.git
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135 lines
4.1 KiB
C++
Executable File
135 lines
4.1 KiB
C++
Executable File
#include "qqtgraphicsscene.h"
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#include <QGraphicsItem>
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#include <QPainter>
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#include "qqtdefine.h"
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#include "qqtgui-qt.h"
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QQTGraphicsScene::QQTGraphicsScene(QObject *parent) :
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QGraphicsScene(parent)
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{
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}
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QQTGraphicsScene::QQTGraphicsScene(const QRectF &sceneRect, QObject *parent) :
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QGraphicsScene(sceneRect, parent)
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{
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}
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QQTGraphicsScene::QQTGraphicsScene(qreal x, qreal y, qreal width, qreal height, QObject *parent) :
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QGraphicsScene(x, y, width, height, parent)
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{
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}
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/**
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* @brief QQTGraphicsScene::render
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* 经过测试，失真是由于render放缩QPainter和drawItems里面的itemPaint共同导致失真
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* 现在规整理如下，原则：Qpainter不允许改变
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* 重写itemPaint函数
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* @param painter
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* @param target
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* @param source
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* @param aspectRatioMode
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*/
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void QQTGraphicsScene::render(QPainter *painter, const QRectF &target, const QRectF &source, Qt::AspectRatioMode aspectRatioMode)
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{
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// Find the ideal x / y scaling ratio to fit a source into a target.
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QRectF sourceRect = sceneRect();
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QRectF targetRect = sourceRect;
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if(!source.isEmpty())
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sourceRect = source;
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if(!target.isEmpty())
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targetRect = target;
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qreal xratio = targetRect.width() / sourceRect.width();
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qreal yratio = targetRect.height() / sourceRect.height();
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QList<QGraphicsItem *> itemList = items();
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QGraphicsItem **itemArray = new QGraphicsItem *[itemList.size()];
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int numItems = itemList.size();
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for (int i = 0; i < numItems; ++i)
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itemArray[numItems - i - 1] = itemList.at(i);
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itemList.clear();
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painter->save();
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// Generate the style options
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QStyleOptionGraphicsItem *styleOptionArray = new QStyleOptionGraphicsItem[numItems];
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for (int i = 0; i < numItems; ++i) {
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QGraphicsItem *item = itemArray[i];
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QStyleOptionGraphicsItem option;
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option.state = QStyle::State_None;
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if (item->isSelected())
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option.state |= QStyle::State_Selected;
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if (item->isEnabled())
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option.state |= QStyle::State_Enabled;
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if (item->hasFocus())
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option.state |= QStyle::State_HasFocus;
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if (item == mouseGrabberItem())
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option.state |= QStyle::State_Sunken;
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option.exposedRect = item->boundingRect();
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option.rect.setLeft(item->pos().x()*xratio);
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option.rect.setWidth(option.exposedRect.width()*xratio);
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option.rect.setTop(item->pos().y()*yratio);
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option.rect.setHeight(option.exposedRect.height()*yratio);
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//pline() << xratio << yratio << item->pos() << option.rect << option.exposedRect;
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styleOptionArray[i] = option;
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}
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// Render the scene.
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drawBackground(painter, targetRect);
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drawItems(painter, numItems, itemArray, styleOptionArray);
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drawForeground(painter, targetRect);
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delete [] itemArray;
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delete [] styleOptionArray;
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painter->restore();
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}
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QQTGraphicsTextItem *QQTGraphicsScene::addText(const QString &text, const QFont &font)
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{
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QQTGraphicsTextItem* item = new QQTGraphicsTextItem;
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item->setFont(font);
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item->setPlainText(text);
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addItem(item);
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return item;
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}
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QQTGraphicsRectItem *QQTGraphicsScene::addRect(const QRectF &rect, const QPen &pen, const QBrush &brush)
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{
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QQTGraphicsRectItem* item = new QQTGraphicsRectItem;
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item->setRect(rect);
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item->setPen(pen);
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item->setBrush(brush);
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item->moveBy(rect.x(), rect.y());
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addItem(item);
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return item;
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}
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QQTGraphicsLineItem *QQTGraphicsScene::addLine(const QLineF &line, const QPen &pen)
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{
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QQTGraphicsLineItem* item = new QQTGraphicsLineItem;
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item->setLine(line);
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item->setPen(pen);
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item->moveBy(line.x1(), line.y1());
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addItem(item);
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return item;
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}
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void QQTGraphicsScene::drawItems(QPainter *painter, int numItems, QGraphicsItem *items[], const QStyleOptionGraphicsItem options[], QWidget *widget)
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{
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for (int i = 0; i < numItems; ++i) {
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QQTGraphicsItem *item = (QQTGraphicsItem*)items[i];
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if (item->flags() & QGraphicsItem::ItemClipsToShape) {
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//painter->setClipPath(item->shape(), Qt::IntersectClip);
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}
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item->paint(painter, &options[i], widget);
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}
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}
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