#include "QGView.h"
#include <QScrollBar>
#include <QDebug>
#include "ControlItem.h"
#include "BaseItem.h"
#include <QFileDialog>
#include <QAction>
#include <QLabel>
#include "QGScene.h"
#include <QHBoxLayout>


QGView::QGView(QWidget *parent) : QGraphicsView(parent)
{
	//https://gitee.com/falion/qt-draw-region
    this->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);//解决拖动是背景图片残影
    setDragMode(QGraphicsView::ScrollHandDrag);
    drawBg();

    //反锯齿
    setRenderHints(QPainter::Antialiasing);
    // 隐藏水平/竖直滚动条
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    this->setBackgroundBrush(Qt::gray);

    /*以鼠标中心进行缩放*/
    setMouseTracking(true);
    setTransformationAnchor(QGraphicsView::AnchorUnderMouse);//设置视口变换的锚点，这个属性控制当视图做变换时应该如何摆放场景的位置
    setResizeAnchor(QGraphicsView::AnchorUnderMouse);

    // 设置场景范围
    setSceneRect(INT_MIN / 2, INT_MIN / 2, INT_MAX, INT_MAX);
    //setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));

    scene=new QGScene(this);
    this->setScene(scene);



    addAction(new QAction(QString::fromLocal8Bit("保存原图"),this));
    addAction(new QAction(QString::fromLocal8Bit("保存截图"),this));
    setContextMenuPolicy(Qt::ActionsContextMenu);

    GrayValue=new QLabel(this);//显示灰度值
    GrayValue->setStyleSheet("color:rgb(50,255,0); background-color:rgb(80,80,80,180); font-size: 23px;font-weight: 400px;");
    GrayValue->setFixedWidth(160);
    GrayValue->setFixedHeight(60);
}
void QGView::DispImage(QImage &Image)
{
    ImageCatch=Image.copy();
    image=QPixmap::fromImage(Image);
    GetFit();
}
void QGView::AddItems(BaseItem *item)
{
    this->scene->addItem(item);
    scene->UpDateZoom(1.0/ZoomValue);
}

void QGView::DispItem(const QPainterPath &ItemPath, bool onImage)
{
    if(onImage)
    {
       // QPainter painter(&pixmap);//https://gitee.com/falion/qt-draw-region
    }else
    {

    }
}


void QGView::ClearObj()
{
    foreach(auto item,scene->items())
    {
        scene->removeItem(item);
    }
}
void QGView::ZoomFrame(double value)
{   
    scene->UpDateZoom(1.0/value);
    this->setTransform(QTransform(value,0,0,value,0,0));
}
void QGView::GetFit()
{    
    if(this->width()<1||image.width()<1)
    {
        return;
    }
    //图片自适应方法
    qreal winWidth=this->width();
    qreal winHeight=this->height();
    qreal ScaleWidth=(image.width()+1)/winWidth;
    qreal ScaleHeight=(image.height()+1)/winHeight;
    qreal row1,column1;
    if(ScaleWidth>=ScaleHeight)
    {
        row1= -(1) * ((winHeight * ScaleWidth) - image.height()) / 2;
        column1 = 0  ;
        ZoomValue=1/ScaleWidth;
    }
    else
    {
        row1= 0;
        column1 = -(1.0) * ((winWidth * ScaleHeight) - image.width()) / 2 ;
        ZoomValue=1/ScaleHeight;
    }
    PixX=column1*ZoomValue;
    PixY=row1*ZoomValue;
    ZoomFrame(ZoomValue);
    QScrollBar *pHbar =  this->horizontalScrollBar();
    pHbar->setSliderPosition(PixX);
    QScrollBar *pVbar = this->verticalScrollBar();
    pVbar->setSliderPosition(PixY);
}
void QGView::drawBg()
{
    bgPix.fill(color1);
    QPainter painter(&bgPix);
    painter.fillRect(0, 0, 32, 32, color2);
    painter.fillRect(32, 32, 32, 32, color2);
    painter.end();
}
void QGView::mousePressEvent(QMouseEvent *event)
{
    //qDebug()<<"click";
    QGraphicsView::mousePressEvent(event);
}
void QGView::resizeEvent(QResizeEvent *event)
{
    GetFit();
    QGraphicsView::resizeEvent(event);
}
void QGView::mouseReleaseEvent(QMouseEvent *event)
{
    QGraphicsView::mouseReleaseEvent(event);
}
void QGView::mouseDoubleClickEvent(QMouseEvent *event)
{
    GetFit();
    QGraphicsView::mouseDoubleClickEvent(event);
}
void QGView::mouseMoveEvent(QMouseEvent *event)
{
    auto item=this->mapToScene(event->pos());
    int X=item.x();
    int Y=item.y();

    if(X>-1&&X<ImageCatch.width()&&Y>-1&&Y<ImageCatch.height())
    {
        int R,G,B;
        ImageCatch.pixelColor(X, Y).getRgb(&R,&G,&B);

        QString InfoVal=QString("[%1 %2 %3]\n{X%4 Y%5}").arg(QString::number(R),3,' ')
                .arg(QString::number(G),3,' ')
                .arg(QString::number(B),3,' ')
                .arg(QString::number((int)X),4,' ')
                .arg(QString::number((int)Y),4,' ');
        GrayValue->setText(InfoVal);
    }

    QGraphicsView::mouseMoveEvent(event);
}
void QGView::wheelEvent(QWheelEvent *event)
{
    ZoomValue=event->angleDelta().y()>0?ZoomValue*1.1:ZoomValue*0.9;
    ZoomValue=qMax(ZoomValue,0.1);
    ZoomValue=qMin(ZoomValue,40.0);
    ZoomFrame(ZoomValue);
}
void QGView::drawForeground(QPainter *painter, const QRectF &rect)
{
    Q_UNUSED(rect);
    Q_UNUSED(painter);
    painter->drawPixmap(QPoint(), QPixmap(100,100));//绘制背景曾
}
void QGView::drawBackground(QPainter *painter, const QRectF &rect)
{
    Q_UNUSED(rect);
    painter->drawPixmap(QPoint(), image);//绘制背景曾
}
void QGView::paintEvent(QPaintEvent *event)
{
    QPainter paint(this->viewport());
    paint.drawTiledPixmap(QRect(QPoint(0,0),QPoint(this->width(),this->height())), bgPix);//绘制背景曾
    QGraphicsView::paintEvent(event);
}