Add imageCropper

imagecropper/base/imagecropperlabel.h

@@ -0,0 +1,168 @@
+#ifndef IMAGECROPPERLABEL_H
+#define IMAGECROPPERLABEL_H
+
+#include <QLabel>
+#include <QPixmap>
+#include <QPen>
+
+enum class CropperShape {
+    UNDEFINED = 0,
+    RECT = 1,
+    SQUARE = 2,
+    FIXED_RECT = 3,
+    ELLIPSE = 4,
+    CIRCLE = 5,
+    FIXED_ELLIPSE = 6
+};
+
+enum class OutputShape {
+    RECT = 0,
+    ELLIPSE = 1
+};
+
+enum class SizeType {
+    fixedSize = 0,
+    fitToMaxWidth = 1,
+    fitToMaxHeight = 2,
+    fitToMaxWidthHeight = 3,
+};
+
+class ImageCropperLabel : public QLabel
+{
+    Q_OBJECT
+public:
+    ImageCropperLabel(int width, int height, QWidget *parent);
+
+    void setOriginalImage(const QPixmap &pixmap);
+    void setOutputShape(OutputShape shape) { outputShape = shape; }
+    QPixmap getCroppedImage();
+    QPixmap getCroppedImage(OutputShape shape);
+
+    /*****************************************
+     * Set cropper's shape
+    *****************************************/
+    void setRectCropper();
+    void setSquareCropper();
+    void setEllipseCropper();
+    void setCircleCropper();
+    void setFixedRectCropper(QSize size);
+    void setFixedEllipseCropper(QSize size);
+    void setCropper(CropperShape shape, QSize size); // not recommended
+
+    /*****************************************************************************
+     * Set cropper's fixed size
+    *****************************************************************************/
+    void setCropperFixedSize(int fixedWidth, int fixedHeight);
+    void setCropperFixedWidth(int fixedWidht);
+    void setCropperFixedHeight(int fixedHeight);
+
+    /*****************************************************************************
+     * Set cropper's minimum size
+     * default: the twice of minimum of the edge lenght of drag square
+    *****************************************************************************/
+    void setCropperMinimumSize(int minWidth, int minHeight)
+    {
+        cropperMinimumWidth = minWidth;
+        cropperMinimumHeight = minHeight;
+    }
+    void setCropperMinimumWidth(int minWidth) { cropperMinimumWidth = minWidth; }
+    void setCropperMinimumHeight(int minHeight) { cropperMinimumHeight = minHeight; }
+
+    /*************************************************
+     * Set the size, color, visibility of rectangular border
+    *************************************************/
+    void setShowRectBorder(bool show) { isShowRectBorder = show; }
+    QPen getBorderPen() { return borderPen; }
+    void setBorderPen(const QPen &pen) { borderPen = pen; }
+
+    /*************************************************
+     * Set the size, color of drag square
+    *************************************************/
+    void setShowDragSquare(bool show) { isShowDragSquare = show; }
+    void setDragSquareEdge(int edge) { dragSquareEdge = (edge >= 3 ? edge : 3); }
+    void setDragSquareColor(const QColor &color) { dragSquareColor = color; }
+
+    /*****************************************
+     *  Opacity Effect
+    *****************************************/
+    void enableOpacity(bool b = true) { isShowOpacityEffect = b; }
+    void setOpacity(double newOpacity) { opacity = newOpacity; }
+
+signals:
+    void croppedImageChanged();
+
+protected:
+    /*****************************************
+     * Event
+    *****************************************/
+    virtual void paintEvent(QPaintEvent *event) override;
+    virtual void mousePressEvent(QMouseEvent *e) override;
+    virtual void mouseMoveEvent(QMouseEvent *e) override;
+    virtual void mouseReleaseEvent(QMouseEvent *e) override;
+
+private:
+    /***************************************
+     * Draw shapes
+    ***************************************/
+    void drawFillRect(QPoint centralPoint, int edge, QColor color);
+    void drawRectOpacity();
+    void drawEllipseOpacity();
+    void drawOpacity(const QPainterPath &path); // shadow effect
+    void drawSquareEdge(bool onlyFourCorners);
+
+    /***************************************
+     * Other utility methods
+    ***************************************/
+    int getPosInCropperRect(const QPoint &pt);
+    bool isPosNearDragSquare(const QPoint &pt1, const QPoint &pt2);
+    void resetCropperPos();
+    void changeCursor();
+
+    enum {
+        RECT_OUTSIZD = 0,
+        RECT_INSIDE = 1,
+        RECT_TOP_LEFT,
+        RECT_TOP,
+        RECT_TOP_RIGHT,
+        RECT_RIGHT,
+        RECT_BOTTOM_RIGHT,
+        RECT_BOTTOM,
+        RECT_BOTTOM_LEFT,
+        RECT_LEFT
+    };
+
+    const bool ONLY_FOUR_CORNERS = true;
+
+private:
+    QPixmap originalImage;
+    QPixmap tempImage;
+
+    bool isShowRectBorder = true;
+    QPen borderPen;
+
+    CropperShape cropperShape = CropperShape::UNDEFINED;
+    OutputShape outputShape = OutputShape::RECT;
+
+    QRect imageRect; // the whole image area in the label (not real size)
+    QRect cropperRect; // a rectangle frame to choose image area (not real size)
+    QRect cropperRect_; // cropper rect (real size)
+    double scaledRate = 1.0;
+
+    bool isLButtonPressed = false;
+    bool isCursorPosCalculated = false;
+    int cursorPosInCropperRect = RECT_OUTSIZD;
+    QPoint lastPos;
+    QPoint currPos;
+
+    bool isShowDragSquare = true;
+    int dragSquareEdge = 8;
+    QColor dragSquareColor = Qt::white;
+
+    int cropperMinimumWidth = dragSquareEdge * 2;
+    int cropperMinimumHeight = dragSquareEdge * 2;
+
+    bool isShowOpacityEffect = false;
+    double opacity = 0.6;
+};
+
+#endif // IMAGECROPPERLABEL_H