Split signal painting into 3 layers

[pulseview.git] / pv / view / trace.h

diff --git a/pv/view/trace.h b/pv/view/trace.h
index ffd87fa45524feae6e5d2cade3d3ef86cdb368da..07f90f4c92734e718f085f7b9b0bc0fc1d913564 100644 (file)
--- a/pv/view/trace.h
+++ b/pv/view/trace.h
@@ -23,6 +23,7 @@
 
 #include <QColor>
 #include <QPainter>
+#include <QPen>
 #include <QRect>
 #include <QString>
 
@@ -43,6 +44,7 @@ class Trace : public SelectableItem
        Q_OBJECT
 
 private:
+       static const QPen AxisPen;
        static const int LabelHitPadding;
 
 protected:
@@ -87,12 +89,28 @@ public:
        virtual void set_view(pv::view::View *view);
 
        /**
-        * Paints the trace with a QPainter
+        * Paints the background layer of the trace with a QPainter
         * @param p the QPainter to paint into.
         * @param left the x-coordinate of the left edge of the signal
         * @param right the x-coordinate of the right edge of the signal
         **/
-       virtual void paint(QPainter &p, int left, int right) = 0;
+       virtual void paint_back(QPainter &p, int left, int right);
+
+       /**
+        * Paints the mid-layer of the trace with a QPainter
+        * @param p the QPainter to paint into.
+        * @param left the x-coordinate of the left edge of the signal
+        * @param right the x-coordinate of the right edge of the signal
+        **/
+       virtual void paint_mid(QPainter &p, int left, int right);
+
+       /**
+        * Paints the foreground layer of the trace with a QPainter
+        * @param p the QPainter to paint into.
+        * @param left the x-coordinate of the left edge of the signal
+        * @param right the x-coordinate of the right edge of the signal
+        **/
+       virtual void paint_fore(QPainter &p, int left, int right);
 
        /**
         * Paints the signal label into a QGLWidget.
@@ -113,6 +131,21 @@ public:
         */
        bool pt_in_label_rect(int left, int right, const QPoint &point);
 
+protected:
+       /**
+        * Gets the y-offset of the axis.
+        */
+       int get_y() const;
+
+       /**
+        * Paints a zero axis across the viewport.
+        * @param p the QPainter to paint into.
+        * @param y the y-offset of the axis.
+        * @param left the x-coordinate of the left edge of the view.
+        * @param right the x-coordinate of the right edge of the view.
+        */
+       void paint_axis(QPainter &p, int y, int left, int right);
+
 private:
 
        /**