X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fview%2Fanalogsignal.cpp;h=683757d1a52cffc1f781bee07d73ca3b16f8b43c;hp=fe2979b0be8ac36efe3f520bda5d59a9e0abf9a5;hb=69e33a1b71599bbe35176ef7a77b58793a7d6ca2;hpb=fe3a1c218407f6b8a0d7ac7c454593809212ea9e

diff --git a/pv/view/analogsignal.cpp b/pv/view/analogsignal.cpp
index fe2979b0..683757d1 100644
--- a/pv/view/analogsignal.cpp
+++ b/pv/view/analogsignal.cpp
@@ -22,6 +22,8 @@
 
 #include <cassert>
 #include <cmath>
+#include <cstdlib>
+#include <limits>
 
 #include "analogsignal.hpp"
 #include "pv/data/analog.hpp"
@@ -58,7 +60,8 @@ AnalogSignal::AnalogSignal(
 	shared_ptr<data::Analog> data) :
 	Signal(session, channel),
 	data_(data),
-	scale_(1.0f)
+	scale_index_(0),
+	scale_index_drag_offset_(0)
 {
 	colour_ = SignalColours[channel_->index() % countof(SignalColours)];
 }
@@ -77,14 +80,27 @@ shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
 	return data_;
 }
 
-void AnalogSignal::set_scale(float scale)
+std::pair<int, int> AnalogSignal::v_extents() const
 {
-	scale_ = scale;
+	const int h = NominalHeight / 2;
+	return make_pair(-h, h);
 }
 
-std::pair<int, int> AnalogSignal::v_extents() const
+int AnalogSignal::scale_handle_offset() const
+{
+	return ((scale_index_drag_offset_ - scale_index_) *
+		NominalHeight / 4) - NominalHeight / 2;
+}
+
+void AnalogSignal::scale_handle_dragged(int offset)
+{
+	scale_index_ = scale_index_drag_offset_ -
+		(offset + NominalHeight / 2) / (NominalHeight / 4);
+}
+
+void AnalogSignal::scale_handle_drag_release()
 {
-	return make_pair(-NominalHeight / 2, NominalHeight / 2);
+	scale_index_drag_offset_ = scale_index_;
 }
 
 void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)
@@ -112,16 +128,16 @@ void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
 		segments.front();
 
 	const double pixels_offset = pp.pixels_offset();
-	const double samplerate = segment->samplerate();
-	const double start_time = segment->start_time();
+	const double samplerate = max(1.0, segment->samplerate());
+	const pv::util::Timestamp& start_time = segment->start_time();
 	const int64_t last_sample = segment->get_sample_count() - 1;
 	const double samples_per_pixel = samplerate * pp.scale();
-	const double start = samplerate * (pp.offset() - start_time);
-	const double end = start + samples_per_pixel * pp.width();
+	const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
+	const pv::util::Timestamp end = start + samples_per_pixel * pp.width();
 
-	const int64_t start_sample = min(max((int64_t)floor(start),
+	const int64_t start_sample = min(max(floor(start).convert_to<int64_t>(),
 		(int64_t)0), last_sample);
-	const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
+	const int64_t end_sample = min(max((ceil(end) + 1).convert_to<int64_t>(),
 		(int64_t)0), last_sample);
 
 	if (samples_per_pixel < EnvelopeThreshold)
@@ -139,6 +155,7 @@ void AnalogSignal::paint_trace(QPainter &p,
 	int y, int left, const int64_t start, const int64_t end,
 	const double pixels_offset, const double samples_per_pixel)
 {
+	const float scale = this->scale();
 	const int64_t sample_count = end - start;
 
 	const float *const samples = segment->get_samples(start, end);
@@ -153,7 +170,7 @@ void AnalogSignal::paint_trace(QPainter &p,
 		const float x = (sample / samples_per_pixel -
 			pixels_offset) + left;
 		*point++ = QPointF(x,
-			y - samples[sample - start] * scale_);
+			y - samples[sample - start] * scale);
 	}
 
 	p.drawPolyline(points, point - points);
@@ -169,6 +186,8 @@ void AnalogSignal::paint_envelope(QPainter &p,
 {
 	using pv::data::AnalogSegment;
 
+	const float scale = this->scale();
+
 	AnalogSegment::EnvelopeSection e;
 	segment->get_envelope_section(e, start, end, samples_per_pixel);
 
@@ -181,7 +200,7 @@ void AnalogSignal::paint_envelope(QPainter &p,
 	QRectF *const rects = new QRectF[e.length];
 	QRectF *rect = rects;
 
-	for(uint64_t sample = 0; sample < e.length-1; sample++) {
+	for (uint64_t sample = 0; sample < e.length-1; sample++) {
 		const float x = ((e.scale * sample + e.start) /
 			samples_per_pixel - pixels_offset) + left;
 		const AnalogSegment::EnvelopeSample *const s =
@@ -189,13 +208,13 @@ void AnalogSignal::paint_envelope(QPainter &p,
 
 		// We overlap this sample with the next so that vertical
 		// gaps do not appear during steep rising or falling edges
-		const float b = y - max(s->max, (s+1)->min) * scale_;
-		const float t = y - min(s->min, (s+1)->max) * scale_;
+		const float b = y - max(s->max, (s+1)->min) * scale;
+		const float t = y - min(s->min, (s+1)->max) * scale;
 
 		float h = b - t;
-		if(h >= 0.0f && h <= 1.0f)
+		if (h >= 0.0f && h <= 1.0f)
 			h = 1.0f;
-		if(h <= 0.0f && h >= -1.0f)
+		if (h <= 0.0f && h >= -1.0f)
 			h = -1.0f;
 
 		*rect++ = QRectF(x, t, 1.0f, h);
@@ -207,5 +226,15 @@ void AnalogSignal::paint_envelope(QPainter &p,
 	delete[] e.samples;
 }
 
+float AnalogSignal::scale() const
+{
+	const float seq[] = {1.0f, 2.0f, 5.0f};
+	const int offset = std::numeric_limits<int>::max() / (2 * countof(seq));
+	const std::div_t d = std::div(
+		(int)(scale_index_ + countof(seq) * offset),
+		countof(seq));
+	return powf(10.0f, d.quot - offset) * seq[d.rem];
+}
+
 } // namespace view
 } // namespace pv