ok

tmp/ex5.lua

@@ -0,0 +1,41 @@
+local kiwi = require("kiwi")
+
+local Var = kiwi.Var
+
+x1 = Var("x1")
+x2 = Var("x2")
+xm = Var("xm")
+
+local constraints = { x1:ge(0), x2:le(100), x2:ge(x1 + 10), xm:eq((x1 + x2) / 2) }
+
+local solver = kiwi.Solver()
+
+for _, c in ipairs(constraints) do
+   solver:add_constraint(c)
+end
+
+local c = kiwi.constraints.single(x1, 40, "EQ", kiwi.Strength.WEAK)
+solver:add_constraint(c)
+
+constraints[#constraints + 1] = c
+
+solver:add_edit_var(xm, kiwi.Strength.STRONG)
+
+solver:suggest_value(xm, 60)
+
+solver:update_vars()
+
+print(xm:value(), x1:value(), x2:value())
+
+for _, c in ipairs(constraints) do
+   print(c, c:violated())
+end
+
+solver:suggest_value(xm, 90)
+solver:update_vars()
+
+print(xm:value(), x1:value(), x2:value())
+
+for _, c in ipairs(constraints) do
+   print(c, c:violated())
+end