code_app/app/scanner/dialog_imageeditor.cpp

#include "dialog_imageeditor.h"
#include "ui_dialog_imageeditor.h"
#include "graphicsscene.h"
#include <QColorDialog>
#include <app_cfg.h>

int m_textSize[] = { 6, 7, 8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 28, 72 };
int m_lineWidth[] = { 1, 3, 5, 8 };
float m_scaled[] = { 0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f, 0.8f, 1.0f, 1.2f, 1.5f, 2.0f, 2.5f, 4.0f, 6.0f };
Dialog_ImageEditor::Dialog_ImageEditor(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::Dialog_ImageEditor)
    , m_scene(new GraphicsScene())
    , m_index_scaled(7)
{
    ui->setupUi(this);
    setWindowFlags(Qt::Dialog | Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint);
    for (int i = 0; i < ui->comboBox_textSize->count(); i++)
        ui->comboBox_textSize->setItemData(i, m_textSize[i]);
    for (int i = 0; i < ui->comboBox_lineWidth->count(); i++)
        ui->comboBox_lineWidth->setItemData(i, m_lineWidth[i]);
    ui->graphicsView->setScene(m_scene);

    m_clrName = getCfgValue("imageEditor", "color", QString("red"));
    ui->btn_color->setStyleSheet(QString("QPushButton{background-color:%1;border:1px solid %2}").arg(m_clrName).arg(m_clrName));

    ui->comboBox_lineWidth->setCurrentIndex(getCfgValue("imageEditor", "lineWidth", 0));
    ui->comboBox_textSize->setCurrentIndex(getCfgValue("imageEditor", "textSize", 0));

    ui->comboBox_textSize->setFixedWidth(80);
    ui->comboBox_lineWidth->setFixedWidth(120);
}

Dialog_ImageEditor::~Dialog_ImageEditor()
{
    delete ui;
}

void Dialog_ImageEditor::setImage(const QImage &image)
{
    m_imageSize = image.size();
    m_dpi_x = image.dotsPerMeterX();
    m_dpi_y = image.dotsPerMeterY();
    m_scene->addPixmap(QPixmap::fromImage(image));
}

QImage Dialog_ImageEditor::exportImage()
{
    QImage image(m_imageSize, QImage::Format_RGB888);
    image.setDotsPerMeterX(m_dpi_x);
    image.setDotsPerMeterY(m_dpi_y);
    QPainter painter(&image);
    m_scene->render(&painter);   //关键函数
    return image;
}

void Dialog_ImageEditor::on_btn_rect_clicked(bool checked)
{
    if (checked)
    {
        m_scene->createShape(GraphicsScene::Rect);
        ui->btn_arrow->setChecked(false);
        //ui->btn_rect->setChecked(false);
        ui->btn_ellipse->setChecked(false);
        ui->btn_text->setChecked(false);
        ui->btn_line->setChecked(false);
        ui->btn_pen->setChecked(false);
    }
}

void Dialog_ImageEditor::on_btn_ellipse_clicked(bool checked)
{
    if (checked)
    {
        m_scene->createShape(GraphicsScene::Ellipse);
        ui->btn_arrow->setChecked(false);
        ui->btn_rect->setChecked(false);
        //ui->btn_ellipse->setChecked(false);
        ui->btn_text->setChecked(false);
        ui->btn_line->setChecked(false);
        ui->btn_pen->setChecked(false);
    }
}

void Dialog_ImageEditor::on_btn_line_clicked(bool checked)
{
    if (checked)
    {
        m_scene->createShape(GraphicsScene::Line);
        ui->btn_arrow->setChecked(false);
        ui->btn_rect->setChecked(false);
        ui->btn_ellipse->setChecked(false);
        ui->btn_text->setChecked(false);
        //ui->btn_line->setChecked(false);
        ui->btn_pen->setChecked(false);
    }
}

void Dialog_ImageEditor::on_btn_text_clicked(bool checked)
{
    if (checked)
    {
        m_scene->createShape(GraphicsScene::Text);
        ui->btn_arrow->setChecked(false);
        ui->btn_rect->setChecked(false);
        ui->btn_ellipse->setChecked(false);
        //ui->btn_text->setChecked(false);
        ui->btn_line->setChecked(false);
        ui->btn_pen->setChecked(false);
    }
}

void Dialog_ImageEditor::on_btn_arrow_clicked(bool checked)
{
    if (checked)
    {
        m_scene->createShape(GraphicsScene::Arrow);
        //ui->btn_arrow->setChecked(false);
        ui->btn_rect->setChecked(false);
        ui->btn_ellipse->setChecked(false);
        ui->btn_text->setChecked(false);
        ui->btn_line->setChecked(false);
        ui->btn_pen->setChecked(false);
    }
}

void Dialog_ImageEditor::on_btn_pen_clicked(bool checked)
{
    if (checked)
    {
        m_scene->createShape(GraphicsScene::Pen);
        ui->btn_arrow->setChecked(false);
        ui->btn_rect->setChecked(false);
        ui->btn_ellipse->setChecked(false);
        ui->btn_text->setChecked(false);
        ui->btn_line->setChecked(false);
        //ui->btn_pen->setChecked(false);
    }
}

void Dialog_ImageEditor::on_btn_color_clicked()
{
    QColorDialog dlg;
    if (!dlg.exec())
        return;

    m_clrName = dlg.selectedColor().name();
    ui->btn_color->setStyleSheet(QString("QPushButton{background-color:%1;border:1px solid %2}").arg(m_clrName).arg(m_clrName));
    m_scene->setColor(dlg.selectedColor());
}

void Dialog_ImageEditor::on_comboBox_lineWidth_currentIndexChanged(int index)
{
    m_scene->setLineWidth(ui->comboBox_lineWidth->itemData(index).toInt());
}

void Dialog_ImageEditor::on_comboBox_textSize_currentIndexChanged(int index)
{
    m_scene->setTextSize(ui->comboBox_textSize->itemData(index).toInt());
}

void Dialog_ImageEditor::on_btn_undo_clicked()
{
    m_scene->unDo();
}

void Dialog_ImageEditor::on_btn_ok_clicked()
{
    saveCfgValue("imageEditor", "lineWidth", ui->comboBox_lineWidth->currentIndex());
    saveCfgValue("imageEditor", "textSize", ui->comboBox_textSize->currentIndex());
    saveCfgValue("imageEditor", "color", m_clrName);

    accept();
}

void Dialog_ImageEditor::on_btn_cancel_clicked()
{
    reject();
}

void Dialog_ImageEditor::on_btn_zoomIn_clicked()
{
    m_index_scaled++;
    QTransform tran;
    tran.scale(m_scaled[m_index_scaled], m_scaled[m_index_scaled]);
    ui->graphicsView->setTransform(tran);

    ui->btn_zoomOut->setEnabled(m_index_scaled > 0);
    ui->btn_zoomIn->setEnabled(m_index_scaled + 1 < sizeof(m_scaled) / sizeof(m_scaled[0]));
}

void Dialog_ImageEditor::on_btn_zoomOut_clicked()
{
    m_index_scaled--;
    QTransform tran;
    tran.scale(m_scaled[m_index_scaled], m_scaled[m_index_scaled]);
    ui->graphicsView->setTransform(tran);

    ui->btn_zoomOut->setEnabled(m_index_scaled > 0);
    ui->btn_zoomIn->setEnabled(m_index_scaled + 1 < sizeof(m_scaled) / sizeof(m_scaled[0]));
}

void Dialog_ImageEditor::on_btn_zoom_clicked()
{
    ui->graphicsView->setTransform(QTransform());
}