GSoC/2019/StatusReports/hellozee

Porting Magnetic Lasso to Krita

Summary

• Project Name: Porting Magnetic Lasso to Krita
• Proposal: View Proposal
• Abstract: The Magnetic Lasso was lost during the port from Qt3 to Qt4, this project tries to continue the working to port the tool to the current version of Krita

Project Goals

• Add the Magnetic Lasso Selection Tool in Krita.
• The tool when used should stick to the edges found in the picture.
• Starts after user left clicks and makes an anchor, edges are scanned from the anchor point.
• After the mouse moves a fixed amount of distance the tool automatically places another anchor point and uses it as a reference.
• The user can also manually set an anchor point, him/herself.
• The search radius which is used to determine, upto what area the tool would search for an edge as well as the frequency of anchors can be adjusted by the user.
• The above-mentioned parameters as well as the threshold for determining edges can be adjusted using the tool options widget.

Project related links

• Phabricator Task
• Personal Blog

Implementations Status

Status report on each goal implementation.

KisMagneticWorker

Goal: Implement the worker for the algorithm and the corresponding unit test.

Current Status Working on wrapping the KisPaintDevice to boost::graph for using boost::astar_search

TODO Generate proper test cases, for the testing the worker

Related blog posts

• Initial Post
• Understanding boost::astar_search
• Another week with boost
• Done with boost

Commits and Differentials

• Adding an initial framework for the test
• Applying Laplacian of Gaussian on KisPaintDevice
• Added the heuristic function for the boost::astar_search
• Implemented boost::graph interface for KisPaintDevice
• an intesity function to the graph for reading threshold
• Implemented boost::astar_search using the KisMagneticGraph wrapper
• heuristic function takes threshold into account now
• Fixed the intensity function