1 files changed, 79 insertions, 0 deletions
diff --git a/apps/web/src/lib/animation/graphic-param-channel.ts b/apps/web/src/lib/animation/graphic-param-channel.ts
new file mode 100644
index 00000000..e77e4c73
--- /dev/null
+++ b/apps/web/src/lib/animation/graphic-param-channel.ts
@@ -0,0 +1,79 @@
+import type {
+	ElementAnimations,
+	GraphicParamPath,
+} from "@/lib/animation/types";
+import type { ParamValues } from "@/lib/params";
+import {
+	getGraphicDefinition,
+	resolveGraphicParams,
+} from "@/lib/graphics";
+import { getChannel } from "./keyframes";
+import { getChannelValueAtTime } from "./interpolation";
+
+export const GRAPHIC_PARAM_PATH_PREFIX = "params.";
+
+export function buildGraphicParamPath({
+	paramKey,
+}: {
+	paramKey: string;
+}): GraphicParamPath {
+	return `${GRAPHIC_PARAM_PATH_PREFIX}${paramKey}`;
+}
+
+export function isGraphicParamPath({
+	propertyPath,
+}: {
+	propertyPath: string;
+}): propertyPath is GraphicParamPath {
+	return propertyPath.startsWith(GRAPHIC_PARAM_PATH_PREFIX);
+}
+
+export function parseGraphicParamPath({
+	propertyPath,
+}: {
+	propertyPath: string;
+}): { paramKey: string } | null {
+	if (!isGraphicParamPath({ propertyPath })) {
+		return null;
+	}
+
+	const paramKey = propertyPath.slice(GRAPHIC_PARAM_PATH_PREFIX.length);
+	return paramKey.length > 0 ? { paramKey } : null;
+}
+
+export function resolveGraphicParamsAtTime({
+	element,
+	localTime,
+}: {
+	element: {
+		definitionId: string;
+		params: ParamValues;
+		animations?: ElementAnimations;
+	};
+	localTime: number;
+}): ParamValues {
+	const definition = getGraphicDefinition({
+		definitionId: element.definitionId,
+	});
+	const baseParams = resolveGraphicParams(definition, element.params);
+	const resolved: ParamValues = { ...baseParams };
+
+	for (const param of definition.params) {
+		const path = buildGraphicParamPath({ paramKey: param.key });
+		const channel = getChannel({
+			animations: element.animations,
+			propertyPath: path,
+		});
+		if (!channel || channel.keyframes.length === 0) {
+			continue;
+		}
+
+		resolved[param.key] = getChannelValueAtTime({
+			channel,
+			time: Math.max(0, localTime),
+			fallbackValue: baseParams[param.key] ?? param.default,
+		}) as number | string | boolean;
+	}
+
+	return resolved;
+}