Bug 995

Summary:	Painting of analog traces is semi-broken
Product:	PulseView	Reporter:	Soeren Apel <soeren>
Component:	Data display	Assignee:	Nobody <nobody>
Status:	CONFIRMED ---
Severity:	major	CC:	bert
Priority:	Normal
Version:	unreleased development snapshot
Target Milestone:	---
Hardware:	All
OS:	All

Description Soeren Apel 2017-07-10 21:27:08 CEST

Using i2c/eeprom_24xx/microchip_24lc64/sainsmart_dds120_powerup_scl_sda_analog.sr as an example.

Issue #1: When zooming in on the "flat" part in the beginning, the smooth trace becomes slightly grainy. Painting is done via AnalogSignal::paint_envelope().

Issue #2: When zooming in further, the trace becomes thinner. Painting is done via AnalogSignal::paint_envelope().

Issue #3: Zooming in even further, AnalogSignal::paint_trace() takes over and the trace is suddenly too thin to even see. It becomes one with the zero line, giving the impression that the trace isn't even drawn. Zooming further in shows however that there is a trace once the sample dots become visible.

As those issues are very likely related, I'm only creating one bugzilla entry.