Ticket #436 (closed defect: fixed)

Opened 5 years ago

Last modified 5 years ago

Stylization: Modify rotation calculation to use atan

Reported by: louisewatson Owned by: louisewatson
Priority: medium Milestone: 2.0
Component: Rendering Service Version: 2.0.0
Severity: major Keywords:
Cc: External ID: 1041451

Description

When lines are labeled, some of the labels are upside down making them hard to read.

Change History

Changed 5 years ago by louisewatson

  • owner changed from Louise Watson to louisewatson
  • status changed from new to assigned

Changed 5 years ago by louisewatson

  • status changed from assigned to closed
  • resolution set to fixed

This problem was due to the fact that atan2 was being used to calculate the rotation of the line labels based on the slope of the line. Atan2 takes two parameters, dx and dy, and considers the sign of each to return values in any of the 4 quadrants.

The fix was to calculate the slope as dy/dx and pass to atan. Atan only returns values in the first two quadrants.

Changed 5 years ago by tomfukushima

  • milestone changed from 2.1 to 2.0
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