Struct Solver 

pub struct Solver { /* private fields */ }

The Cassowary incremental constraint solver.

Call update_variables after all constraints and suggestions have been applied, then read values with value_of.

Implementations

impl Solver

pub fn new() -> Self

Create a new empty solver.

pub fn add_constraint( &mut self, constraint: Constraint, ) -> Result<(), SolverError>

Add a constraint to the solver.

pub fn remove_constraint( &mut self, constraint: &Constraint, ) -> Result<(), SolverError>

Remove a previously added constraint.

pub fn add_edit_variable( &mut self, variable: &Variable, strength: f64, ) -> Result<(), SolverError>

Register variable as an edit variable at the given strength.

Must be called before Solver::suggest_value. Strength must not be Strength::REQUIRED.

pub fn suggest_value( &mut self, variable: &Variable, value: f64, ) -> Result<(), SolverError>

Suggest a value for a registered edit variable.

pub fn update_variables(&mut self)

Populate cached variable values.

Call after all constraints and suggestions have been applied, then read values with Solver::value_of.

pub fn value_of(&self, variable: &Variable) -> f64

Return the last computed value for variable (0.0 if not yet solved).

pub fn reset(&mut self)

Reset the solver to the empty starting state.

Trait Implementations

impl Default for Solver

fn default() -> Self

Returns the “default value” for a type.