Qt5基础图形绘制小项目---MainWidget类

其他 2018-05-24 19:30:11 阅读次数: 0 
#ifndef MAINWIDGET_H
#define MAINWIDGET_H

#include <QWidget>
#include "paintarea.h"
#include <QLabel>
#include <QComboBox>
#include <QSpinBox>
#include <QPushButton>
#include <QGridLayout>
#include <QGradient>

class MainWidget : public QWidget
{
    Q_OBJECT
    
public:
    MainWidget(QWidget *parent = 0);
    ~MainWidget();
private:
    PaintArea *paintArea;

    QLabel *shapeLabel;
    QComboBox *shapeComboBox;
    QLabel *penWidthLabel;
    //微调框
    QSpinBox *penWidthSpinBox;
    QLabel *penColorLabel;
    QFrame *penColorFrame;
    QPushButton *penColorBtn;
    QLabel *penStyleLabel;
    QComboBox *penStyleComboBox;
    QLabel *penCapLabel;
    QComboBox *penCapComboBox;
    QLabel *penJoinLabel;
    QComboBox *penJoinComboBox;
    QLabel *fillRuleLabel;
    QComboBox *fillRuleComboBox;
    QLabel *spreadLabel;
    QComboBox *spreadComboBox;
    QGradient::Spread spread;
    QLabel *brushStyleLabel;
    QComboBox *brushStyleComboBox;
    QLabel *brushColorLabel;
    QFrame *brushColorFrame;
    QPushButton *brushColorBtn;

    QGridLayout *rightLayout;

protected slots:
    void ShowShape(int);
    void ShowPenWidth(int);
    void ShowPenColor();
    void ShowPenStyle(int);
    void ShowPenCap(int);
    void ShowPenJoin(int);
    void ShowSpreadStyle();
    void ShowFillRule();
    void ShowBrushColor();
    void ShowBrush(int);
};

#endif // MAINWIDGET_H

#include "mainwidget.h"
#include <QColorDialog>
//乱码解决方案
#pragma execution_character_set("utf-8")
MainWidget::MainWidget(QWidget *parent)
    : QWidget(parent)
{
    paintArea =new PaintArea;

    shapeLabel =new QLabel(tr("形状："));            //形状选择下拉列表框
    shapeComboBox =new QComboBox;
    shapeComboBox->addItem(tr("Line"),PaintArea::Line);
    shapeComboBox->addItem(tr("Rectangle"),PaintArea::Rectangle);
    shapeComboBox->addItem(tr("RoundedRect"),PaintArea::RoundRect);
    shapeComboBox->addItem(tr("Ellipse"),PaintArea::Ellipse);
    shapeComboBox->addItem(tr("Polygon"),PaintArea::Polygon);
    shapeComboBox->addItem(tr("Polyline"),PaintArea::Polyline);
    shapeComboBox->addItem(tr("Points"),PaintArea::Points);
    shapeComboBox->addItem(tr("Arc"),PaintArea::Arc);
    shapeComboBox->addItem(tr("Path"),PaintArea::Path);
    shapeComboBox->addItem(tr("Text"),PaintArea::Text);
    shapeComboBox->addItem(tr("Pixmap"),PaintArea::Pixmap);
    connect(shapeComboBox,SIGNAL(activated(int)),this,SLOT(ShowShape (int)));

    penColorLabel =new QLabel(tr("画笔颜色："));     	//画笔颜色选择控件
    penColorFrame =new QFrame;
    penColorFrame->setFrameStyle(QFrame::Panel|QFrame::Sunken);
    //设置窗体自动填充背景
    penColorFrame->setAutoFillBackground(true);
    penColorFrame->setPalette(QPalette(Qt::blue));
    penColorBtn =new QPushButton(tr("更改"));
    connect(penColorBtn,SIGNAL(clicked()),this,SLOT(ShowPenColor()));

    penWidthLabel =new QLabel(tr("画笔线宽："));     	//画笔线宽选择控件
    penWidthSpinBox =new QSpinBox;
    penWidthSpinBox->setRange(0,20);
    connect(penWidthSpinBox,SIGNAL(valueChanged(int)),this,SLOT (ShowPenWidth(int)));

    penStyleLabel =new QLabel(tr("画笔风格："));     	//画笔风格选择下拉列表框
    penStyleComboBox =new QComboBox;
    penStyleComboBox->addItem(tr("SolidLine"),static_cast<int>(Qt::SolidLine));
    penStyleComboBox->addItem(tr("DashLine"),static_cast<int>(Qt::DashLine));
    penStyleComboBox->addItem(tr("DotLine"),static_cast<int>(Qt::DotLine));
    penStyleComboBox->addItem(tr("DashDotLine"),static_cast<int>(Qt::DashDotLine));
    penStyleComboBox->addItem(tr("DashDotDotLine"),static_cast<int>(Qt::DashDotDotLine));
    penStyleComboBox->addItem(tr("CustomDashLine"),static_cast<int>(Qt::CustomDashLine));
    connect(penStyleComboBox,SIGNAL(activated(int)),this,SLOT (ShowPenStyle(int)));

    penCapLabel =new QLabel(tr("画笔顶帽："));        //画笔顶端风格选择下拉列表框
    penCapComboBox =new QComboBox;
    penCapComboBox->addItem(tr("SquareCap"),Qt::SquareCap);
    penCapComboBox->addItem(tr("FlatCap"),Qt::FlatCap);
    penCapComboBox->addItem(tr("RoundCap"),Qt::RoundCap);
    connect(penCapComboBox,SIGNAL(activated(int)),this,SLOT(ShowPenCap (int)));

    penJoinLabel =new QLabel(tr("画笔连接点："));     //画笔连接点风格选择下拉列表框
    penJoinComboBox =new QComboBox;
    penJoinComboBox->addItem(tr("BevelJoin"),Qt::BevelJoin);
    penJoinComboBox->addItem(tr("MiterJoin"),Qt::MiterJoin);
    penJoinComboBox->addItem(tr("RoundJoin"),Qt::RoundJoin);
    connect(penJoinComboBox,SIGNAL(activated(int)),this,SLOT(ShowPenJoin (int)));

    fillRuleLabel =new QLabel(tr("填充模式："));    	//填充模式选择下拉列表框
    fillRuleComboBox =new QComboBox;
    fillRuleComboBox->addItem(tr("Odd Even"),Qt::OddEvenFill);
    fillRuleComboBox->addItem(tr("Winding"),Qt::WindingFill);
    connect(fillRuleComboBox,SIGNAL(activated(int)),this,SLOT (ShowFillRule()));

    spreadLabel =new QLabel(tr("铺展效果："));    	//铺展效果选择下拉列表框
    spreadComboBox =new QComboBox;
    spreadComboBox->addItem(tr("PadSpread"),QGradient::PadSpread);
    spreadComboBox->addItem(tr("RepeatSpread"),QGradient::RepeatSpread);
    spreadComboBox->addItem(tr("ReflectSpread"),QGradient:: ReflectSpread);
    connect(spreadComboBox,SIGNAL(activated(int)),this,SLOT (ShowSpreadStyle()));

    brushColorLabel =new QLabel(tr("画刷颜色："));   	//画刷颜色选择控件
    brushColorFrame =new QFrame;

    brushColorFrame->setFrameStyle(QFrame::Panel|QFrame::Sunken);
    brushColorFrame->setAutoFillBackground(true);
    brushColorFrame->setPalette(QPalette(Qt::green));
    brushColorBtn =new QPushButton(tr("更改"));
    connect(brushColorBtn,SIGNAL(clicked()),this,SLOT (ShowBrushColor()));

    brushStyleLabel =new QLabel(tr("画刷风格："));   	//画刷风格选择下拉列表框
    brushStyleComboBox =new QComboBox;
    brushStyleComboBox->addItem(tr("SolidPattern"),static_cast<int>(Qt::SolidPattern));
    brushStyleComboBox->addItem(tr("Dense1Pattern"),static_cast<int>(Qt::Dense1Pattern));
    brushStyleComboBox->addItem(tr("Dense2Pattern"),static_cast<int>(Qt::Dense2Pattern));
    brushStyleComboBox->addItem(tr("Dense3Pattern"),static_cast<int>(Qt::Dense3Pattern));
    brushStyleComboBox->addItem(tr("Dense4Pattern"),static_cast<int>(Qt::Dense4Pattern));
    brushStyleComboBox->addItem(tr("Dense5Pattern"),static_cast<int>(Qt::Dense5Pattern));
    brushStyleComboBox->addItem(tr("Dense6Pattern"),static_cast<int>(Qt::Dense6Pattern));
    brushStyleComboBox->addItem(tr("Dense7Pattern"),static_cast<int>(Qt::Dense7Pattern));
    brushStyleComboBox->addItem(tr("HorPattern"),static_cast<int>(Qt::HorPattern));
    brushStyleComboBox->addItem(tr("VerPattern"),static_cast<int>(Qt::VerPattern));
    brushStyleComboBox->addItem(tr("CrossPattern"),static_cast<int>(Qt::CrossPattern));
    brushStyleComboBox->addItem(tr("BDiagPattern"),static_cast<int>(Qt::BDiagPattern));
    brushStyleComboBox->addItem(tr("FDiagPattern"),static_cast<int>(Qt::FDiagPattern));
    brushStyleComboBox->addItem(tr("DiagCrossPattern"),static_cast<int>(Qt:: DiagCrossPattern));
    brushStyleComboBox->addItem(tr("LinearGradientPattern"),static_cast<int>(Qt:: LinearGradientPattern));
    brushStyleComboBox->addItem(tr("ConicalGradientPattern"),static_cast<int>(Qt:: ConicalGradientPattern));
    brushStyleComboBox->addItem(tr("RadialGradientPattern"),static_cast<int>(Qt:: RadialGradientPattern));
    brushStyleComboBox->addItem(tr("TexturePattern"),static_cast<int>(Qt::TexturePattern));
    connect(brushStyleComboBox,SIGNAL(activated(int)),this,SLOT (ShowBrush(int)));

    rightLayout =new QGridLayout;                   //控制面板的布局
    rightLayout->addWidget(shapeLabel,0,0);
    rightLayout->addWidget(shapeComboBox,0,1);
    rightLayout->addWidget(penColorLabel,1,0);
    rightLayout->addWidget(penColorFrame,1,1);
    rightLayout->addWidget(penColorBtn,1,2);
    rightLayout->addWidget(penWidthLabel,2,0);
    rightLayout->addWidget(penWidthSpinBox,2,1);
    rightLayout->addWidget(penStyleLabel,3,0);
    rightLayout->addWidget(penStyleComboBox,3,1);
    rightLayout->addWidget(penCapLabel,4,0);
    rightLayout->addWidget(penCapComboBox,4,1);
    rightLayout->addWidget(penJoinLabel,5,0);
    rightLayout->addWidget(penJoinComboBox,5,1);
    rightLayout->addWidget(fillRuleLabel,6,0);
    rightLayout->addWidget(fillRuleComboBox,6,1);
    rightLayout->addWidget(spreadLabel,7,0);
    rightLayout->addWidget(spreadComboBox,7,1);
    rightLayout->addWidget(brushColorLabel,8,0);
    rightLayout->addWidget(brushColorFrame,8,1);
    rightLayout->addWidget(brushColorBtn,8,2);
    rightLayout->addWidget(brushStyleLabel,9,0);
    rightLayout->addWidget(brushStyleComboBox,9,1);

    QHBoxLayout *mainLayout =new QHBoxLayout(this);   	//整体的布局
    mainLayout->addWidget(paintArea);
    mainLayout->addLayout(rightLayout);
    mainLayout->setStretchFactor(paintArea,1);
    mainLayout->setStretchFactor(rightLayout,0);

    ShowShape(shapeComboBox->currentIndex());     		//显示默认的图形
}

MainWidget::~MainWidget()
{
    
}

void MainWidget::ShowShape(int value)
{

    PaintArea::Shape shape = PaintArea::Shape(shapeComboBox->itemData(value,Qt::UserRole).toInt());
    paintArea->setShape(shape);
}

void MainWidget::ShowPenColor()
{
    QColor color = QColorDialog::getColor(static_cast<int>(Qt::blue));
    penColorFrame->setPalette(QPalette(color));
    int value = penWidthSpinBox->value();
    Qt::PenStyle style = Qt::PenStyle(penStyleComboBox->itemData(penStyleComboBox->currentIndex(),Qt::UserRole).toInt());
    Qt::PenCapStyle cap = Qt::PenCapStyle(penCapComboBox->itemData(penCapComboBox->currentIndex(),Qt::UserRole).toInt());
    Qt::PenJoinStyle join=Qt::PenJoinStyle(penJoinComboBox->itemData(penJoinComboBox->currentIndex(),Qt::UserRole).toInt());

    paintArea->setPen(QPen(color,value,style,cap,join));
}

void MainWidget::ShowPenWidth(int value)
{
    QColor color = penColorFrame->palette().color(QPalette::Window);
    Qt::PenStyle style = Qt::PenStyle(penStyleComboBox->itemData(penStyleComboBox->currentIndex(),Qt::UserRole).toInt());
    Qt::PenCapStyle cap = Qt::PenCapStyle(penCapComboBox->itemData(penCapComboBox->currentIndex(),Qt::UserRole).toInt());
    Qt::PenJoinStyle join=Qt::PenJoinStyle(penJoinComboBox->itemData(penJoinComboBox->currentIndex(),Qt::UserRole).toInt());

    paintArea->setPen(QPen(color,value,style,cap,join));
}

void MainWidget::ShowPenStyle(int styleValue)
{
    QColor color = penColorFrame->palette().color(QPalette::Window);
    int value = penWidthSpinBox->value();
    Qt::PenStyle style = Qt::PenStyle(penStyleComboBox->itemData(styleValue,Qt::UserRole).toInt());
    Qt::PenCapStyle cap = Qt::PenCapStyle(penCapComboBox->itemData(penCapComboBox->currentIndex(),Qt::UserRole).toInt());
    Qt::PenJoinStyle join=Qt::PenJoinStyle(penJoinComboBox->itemData(penJoinComboBox->currentIndex(),Qt::UserRole).toInt());

    paintArea->setPen(QPen(color,value,style,cap,join));
}

void MainWidget::ShowPenCap(int capValue)
{
    QColor color = penColorFrame->palette().color(QPalette::Window);
    int value = penWidthSpinBox->value();
    Qt::PenStyle style = Qt::PenStyle(penStyleComboBox->itemData(penStyleComboBox->currentIndex(),Qt::UserRole).toInt());
    Qt::PenCapStyle cap = Qt::PenCapStyle(penCapComboBox->itemData(capValue,Qt::UserRole).toInt());
    Qt::PenJoinStyle join=Qt::PenJoinStyle(penJoinComboBox->itemData(penJoinComboBox->currentIndex(),Qt::UserRole).toInt());

    paintArea->setPen(QPen(color,value,style,cap,join));
}

void MainWidget::ShowPenJoin(int joinValue)
{
    QColor color = penColorFrame->palette().color(QPalette::Window);
    int value = penWidthSpinBox->value();
    Qt::PenStyle style = Qt::PenStyle(penStyleComboBox->itemData(penStyleComboBox->currentIndex(),Qt::UserRole).toInt());
    Qt::PenCapStyle cap = Qt::PenCapStyle(penCapComboBox->itemData(penCapComboBox->currentIndex(),Qt::UserRole).toInt());
    Qt::PenJoinStyle join=Qt::PenJoinStyle(penJoinComboBox->itemData(joinValue,Qt::UserRole).toInt());

    paintArea->setPen(QPen(color,value,style,cap,join));
}

void MainWidget::ShowFillRule()
{
    Qt::FillRule rule = Qt::FillRule(fillRuleComboBox->itemData(fillRuleComboBox->currentIndex(),Qt::UserRole).toInt());
    paintArea->setFillRule(rule);
}

void MainWidget::ShowSpreadStyle()
{
    spread = QGradient::Spread(spreadComboBox->itemData(spreadComboBox->currentIndex(),Qt::UserRole).toInt());
}

void MainWidget::ShowBrushColor()
{
    QColor color = QColorDialog::getColor(static_cast<int>(Qt::blue));
    brushColorFrame->setPalette(QPalette(color));
    ShowBrush(brushStyleComboBox->currentIndex());
}

void MainWidget::ShowBrush(int value)
{
    QColor color = brushColorFrame->palette().color(QPalette::Window);
    Qt::BrushStyle style = Qt::BrushStyle(brushStyleComboBox->itemData(value,Qt::UserRole).toInt());
    if(style == Qt::LinearGradientPattern)
    {
        QLinearGradient linearGradient(0,0,400,400);
        linearGradient.setColorAt(0.0,Qt::white);
        linearGradient.setColorAt(0.2,color);
        linearGradient.setColorAt(1.0,Qt::black);
        linearGradient.setSpread(spread);
        paintArea->setBrush(linearGradient);
    }
    else if(style == Qt::RadialGradientPattern)
    {
        QRadialGradient radialGradient(200,200,150,150,100);
        radialGradient.setColorAt(0.0,Qt::white);
        radialGradient.setColorAt(0.2,color);
        radialGradient.setColorAt(1.0,Qt::black);
        radialGradient.setSpread(spread);
        paintArea->setBrush(radialGradient);
    }
    else if(style == Qt::ConicalGradientPattern)
    {
        QConicalGradient conicalGradient(200,200,30);
        conicalGradient.setColorAt(0.0,Qt::white);
        conicalGradient.setColorAt(0.2,color);
        conicalGradient.setColorAt(1.0,Qt::black);
        paintArea->setBrush(conicalGradient);
    }
    else if(style == Qt::TexturePattern)
    {
        paintArea->setBrush(QBrush(QPixmap("butterfly.png")));
    }
    else
    {
        paintArea->setBrush(QBrush(color,style));
    }
}

 画笔：

         选用不用的参数，对应画笔的不同风格，如下图所示

 

  画笔笔帽：

    

  画笔连接点：

  

填充效果：

  

 铺展效果：

    铺展效果有三种，分别为QGradient::PadSpread、QGradient::RepeatSpread和QGradient:: ReflectSpread。其中，PadSpread是默认的铺展效果，也是最常见的铺展效果，没有被渐变覆盖的区域填充单一的起始颜色或终止颜色；RepeatSpread效果与ReflectSpread效果只对线性渐变和圆形渐变起作用，如下图所示：

  

画刷风格：

   

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