working versiom

IntelliPhoto/Scribble/scribblearea.h

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+// ---------- scribblearea.h ----------
+
+#ifndef SCRIBBLEAREA_H
+#define SCRIBBLEAREA_H
+
+#include <QColor>
+#include <QImage>
+#include <QPoint>
+#include <QWidget>
+
+class ScribbleArea : public QWidget
+{
+    // Declares our class as a QObject which is the base class
+    // for all Qt objects
+    // QObjects handle events
+    Q_OBJECT
+
+public:
+    ScribbleArea(QWidget *parent = nullptr);
+
+    // Handles all events
+    bool openImage(const QString &fileName);
+    bool saveImage(const QString &fileName, const char *fileFormat);
+    void setPenColor(const QColor &newColor);
+    void setPenWidth(int newWidth);
+
+    // Has the image been modified since last save
+    bool isModified() const { return modified; }
+    QColor penColor() const { return myPenColor; }
+    int penWidth() const { return myPenWidth; }
+
+public slots:
+
+    // Events to handle
+    void clearImage();
+
+protected:
+    void mousePressEvent(QMouseEvent *event) override;
+    void mouseMoveEvent(QMouseEvent *event) override;
+    void mouseReleaseEvent(QMouseEvent *event) override;
+
+    // Updates the scribble area where we are painting
+    void paintEvent(QPaintEvent *event) override;
+
+    // Makes sure the area we are drawing on remains
+    // as large as the widget
+    void resizeEvent(QResizeEvent *event) override;
+
+private:
+    void drawLineTo(const QPoint &endPoint);
+    void resizeImage(QImage *image, const QSize &newSize);
+
+    // Will be marked true or false depending on if
+    // we have saved after a change
+    bool modified;
+
+    // Marked true or false depending on if the user
+    // is drawing
+    bool scribbling;
+
+    // Holds the current pen width & color
+    int myPenWidth;
+    QColor myPenColor;
+
+    // Stores the image being drawn
+    QImage image;
+
+    // Stores the location at the current mouse event
+    QPoint lastPoint;
+};
+
+#endif
+