Moved viewport from int64_ts to doubles, and added basic mouse zooming

[pulseview.git] / logicsignal.cpp

diff --git a/logicsignal.cpp b/logicsignal.cpp
index 1587bddd473002d4264d47abafd118d5c3c0cfd2..5377287362065aed52da22a35b0a867cd9bd9542 100644 (file)
--- a/logicsignal.cpp
+++ b/logicsignal.cpp
@@ -22,6 +22,8 @@
 #include <GL/gl.h>
 #include <GL/glext.h>
 
+#include <math.h>
+
 #include "logicdata.h"
 #include "logicdatasnapshot.h"
 #include "logicsignal.h"
@@ -29,6 +31,8 @@
 using namespace boost;
 using namespace std;
 
+const float Log2 = logf(2.0f);
+
 LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
        int probe_index) :
        Signal(name),
@@ -39,12 +43,13 @@ LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
 }
 
 void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
-       uint64_t scale, int64_t offset)
+       double scale, double offset)
 {
        Point2F *vertex;
 
        vector< pair<int64_t, bool> > edges;
 
+       assert(scale > 0);
        assert(_data);
 
        const queue< shared_ptr<LogicDataSnapshot> > &snapshots =
@@ -54,9 +59,17 @@ void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
 
        const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front();
 
-       const int64_t start = 0;
-       const int64_t end = 8000;
-       const int64_t quantization_length = 4;
+       const double pixels_offset = offset / scale;
+       const double samplerate = _data->get_samplerate();
+       const double start_time = _data->get_start_time();
+       const int64_t last_sample = (int64_t)snapshot->get_sample_count() - 1;
+       const double samples_per_pixel = samplerate * scale;
+       const int64_t start = min(max((int64_t)(samplerate * (offset - start_time)),
+               (int64_t)0), last_sample);
+       const int64_t end = min((int64_t)(start + samples_per_pixel * rect.width()),
+               last_sample);
+       const int64_t quantization_length = 1LL << (int64_t)floorf(
+               max(logf(samples_per_pixel / Log2), 0.0f));
 
        snapshot->get_subsampled_edges(edges, start, end,
                quantization_length, _probe_index);
@@ -69,7 +82,7 @@ void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
        for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin() + 1;
            i != edges.end() - 1; i++)
        {
-               const int x = edge.first / quantization_length +
+               const int x = (int)((*i).first / samples_per_pixel - pixels_offset) +
                        rect.left();
 
                vertex->x = x, vertex->y = 10 + rect.top() - 1;
@@ -92,12 +105,12 @@ void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
        {
                const int y = ((*i).second ? 10 : 40) + rect.top();
 
-               vertex->x = (*i).first / quantization_length +
+               vertex->x = (int)((*i).first / samples_per_pixel - pixels_offset) +
                        rect.left() - 1;
                vertex->y = y;
                vertex++;
 
-               vertex->x = (*(i+1)).first / quantization_length +
+               vertex->x = (int)((*(i+1)).first / samples_per_pixel - pixels_offset) +
                        rect.left();
                vertex->y = y;
                vertex++;