math operators: percent of, round up, round down, logarithm (#1603)

* percent operator for math node

* floor and ceiling operations

* ...

* ...

* logarithm operation

* ...

* remove round up/down

* round node

* ...

* ...

* respond to feedback

* ...

backend/src/nodes/nodes/utility/math_node.py

@@ -17,9 +17,11 @@ class MathOperation(Enum):
     MULTIPLY = "mul"
     DIVIDE = "div"
     POWER = "pow"
+    LOG = "log"
     MAXIMUM = "max"
     MINIMUM = "min"
     MODULO = "mod"
+    PERCENT = "percent"
 
 
 OP_LABEL: Dict[MathOperation, str] = {
@@ -28,9 +30,11 @@ class MathOperation(Enum):
     MathOperation.MULTIPLY: "Multiply: a × b",
     MathOperation.DIVIDE: "Divide: a ÷ b",
     MathOperation.POWER: "Exponent: a ^ b",
+    MathOperation.LOG: "Logarithm: log a of b",
     MathOperation.MAXIMUM: "Maximum: max(a, b)",
     MathOperation.MINIMUM: "Minimum: min(a, b)",
     MathOperation.MODULO: "Modulo: a mod b",
+    MathOperation.PERCENT: "Percent: a × b ÷ 100",
 }
 
 _special_mod_numbers = (0.0, float("inf"), float("-inf"), float("nan"))
@@ -71,9 +75,11 @@ def __init__(self):
                     MathOperation::Multiply => a * b,
                     MathOperation::Divide   => a / b,
                     MathOperation::Power    => number::pow(a, b),
+                    MathOperation::Log      => number::log(a) / number::log(b),
                     MathOperation::Maximum  => max(a, b),
                     MathOperation::Minimum  => min(a, b),
                     MathOperation::Modulo   => number::mod(a, b),
+                    MathOperation::Percent  => a * b / 100,
                 }
                 """,
             )
@@ -97,6 +103,8 @@ def run(
             return a / b
         elif op == MathOperation.POWER:
             return a**b
+        elif op == MathOperation.LOG:
+            return math.log(b, a)
         elif op == MathOperation.MAXIMUM:
             return max(a, b)
         elif op == MathOperation.MINIMUM:
@@ -106,5 +114,7 @@ def run(
                 return a - b * math.floor(a / b)
             else:
                 return a % b
+        elif op == MathOperation.PERCENT:
+            return a * b / 100
         else:
             raise RuntimeError(f"Unknown operator {op}")

backend/src/nodes/nodes/utility/round.py

@@ -0,0 +1,132 @@
+from __future__ import annotations
+
+import math
+from enum import Enum
+from typing import Union
+
+import numpy as np
+
+from ...groups import conditional_group
+from ...node_base import NodeBase
+from ...node_factory import NodeFactory
+from ...properties.inputs import EnumInput, NumberInput
+from ...properties.outputs import NumberOutput
+from ...utils.utils import round_half_up
+from . import category as UtilityCategory
+
+
+class RoundOperation(Enum):
+    FLOOR = "Round down"
+    CEILING = "Round up"
+    ROUND = "Round"
+
+
+class RoundScale(Enum):
+    UNIT = "Integer"
+    MULTIPLE = "Multiple of..."
+    POWER = "Power of..."
+
+
+@NodeFactory.register("chainner:utility:math_round")
+class RoundNode(NodeBase):
+    def __init__(self):
+        super().__init__()
+        self.description = "Round an input number"
+        self.inputs = [
+            NumberInput(
+                "Input",
+                minimum=None,
+                maximum=None,
+                precision=100,
+                controls_step=1,
+            ),
+            EnumInput(
+                RoundOperation,
+                "Operation",
+                option_labels={k: k.value for k in RoundOperation},
+            ),
+            EnumInput(
+                RoundScale,
+                "To the nearest",
+                option_labels={k: k.value for k in RoundScale},
+            ),
+            conditional_group(enum=2, condition=RoundScale.MULTIPLE.value)(
+                NumberInput(
+                    "Multiple",
+                    default=1,
+                    minimum=1e-100,
+                    maximum=None,
+                    precision=100,
+                    controls_step=1,
+                )
+            ),
+            conditional_group(enum=2, condition=RoundScale.POWER.value)(
+                NumberInput(
+                    "Power",
+                    default=2,
+                    minimum=np.nextafter(1.0, np.inf),
+                    maximum=None,
+                    precision=100,
+                    controls_step=1,
+                )
+            ),
+        ]
+        self.outputs = [
+            NumberOutput(
+                "Result",
+                output_type="""
+                let x = Input0;
+                let m = Input3;
+                let p = Input4;
+
+                match Input2 {
+                    RoundScale::Unit => match Input1 {
+                        RoundOperation::Floor => floor(x),
+                        RoundOperation::Ceiling => ceil(x),
+                        RoundOperation::Round => round(x),
+                    },
+                    RoundScale::Multiple => match Input1 {
+                        RoundOperation::Floor => floor(x/m) * m,
+                        RoundOperation::Ceiling => ceil(x/m) * m,
+                        RoundOperation::Round => round(x/m) * m,
+                    },
+                    RoundScale::Power => match Input1 {
+                        RoundOperation::Floor => number::pow(p, floor(number::log(x)/number::log(p))),
+                        RoundOperation::Ceiling => number::pow(p, ceil(number::log(x)/number::log(p))),
+                        RoundOperation::Round => number::pow(p, round(number::log(x)/number::log(p))),
+                    },
+                }
+                """,
+            )
+        ]
+
+        self.category = UtilityCategory
+        self.name = "Round"
+        self.icon = "MdCalculate"
+        self.sub = "Math"
+
+    def run(
+        self,
+        a: Union[int, float],
+        operation: RoundOperation,
+        scale: RoundScale,
+        m: Union[int, float],
+        p: Union[int, float],
+    ) -> Union[int, float]:
+        if operation == RoundOperation.FLOOR:
+            op = math.floor
+        elif operation == RoundOperation.CEILING:
+            op = math.ceil
+        elif operation == RoundOperation.ROUND:
+            op = round_half_up
+        else:
+            raise RuntimeError(f"Unknown operation {operation}")
+
+        if scale == RoundScale.UNIT:
+            return op(a)
+        elif scale == RoundScale.MULTIPLE:
+            return op(a / m) * m
+        elif scale == RoundScale.POWER:
+            return p ** op(math.log(a, p))
+        else:
+            raise RuntimeError(f"Unknown scale {scale}")