qtgui: Added a 'vector sink'.

This is a sink similar to the freq sink, which takes vectors as input
and plots them as-is.

Author: mbr0wn

gr-qtgui/examples/alt.qss

@@ -51,6 +51,23 @@ FrequencyDisplayPlot {
     qproperty-marker_noise_floor_amplitude_visible: false;
 }
 
+VectorDisplayPlot {
+    qproperty-line_color1: cyan;
+    qproperty-line_color2: magenta;
+    qproperty-line_color3: purple;
+    qproperty-line_style1: SolidLine;
+    qproperty-line_style2: DashLine;
+    qproperty-line_style3: DotLine;
+    qproperty-max_vec_color: palegreen;
+    qproperty-min_vec_color: darkblue;
+    qproperty-marker_lower_intensity_color: white;
+    qproperty-marker_upper_intensity_color: red;
+    qproperty-marker_lower_intensity_visible: false;
+    qproperty-marker_upper_intensity_visible: false;
+    qproperty-marker_ref_level_color: red;
+    qproperty-marker_ref_level_visible: false;
+}
+
 QwtPlotCanvas
 {
     border: 1px solid White;

gr-qtgui/examples/dark.qss

@@ -38,6 +38,17 @@ FrequencyDisplayPlot {
     qproperty-marker_noise_floor_amplitude_visible: false;
 }
 
+VectorDisplayPlot {
+    qproperty-max_vec_color: palegreen;
+    qproperty-min_vec_color: palegreen;
+    qproperty-marker_lower_intensity_color: white;
+    qproperty-marker_upper_intensity_color: red;
+    qproperty-marker_lower_intensity_visible: false;
+    qproperty-marker_upper_intensity_visible: false;
+    qproperty-marker_ref_level_amplitude_color: red;
+    qproperty-marker_ref_level_amplitude_visible: false;
+}
+
 QwtPlotCanvas
 {
     border: 1px solid White;