feat(platform): 开源发布 - 初始化 Open AI Canvas

web/src/lib/canvas/canvas-node-size.ts

@@ -0,0 +1,16 @@
+export function fitNodeSize(width: number, height: number, maxWidth = 640, maxHeight = 640) {
+    const w = Math.max(1, width);
+    const h = Math.max(1, height);
+    const scale = Math.min(1, maxWidth / w, maxHeight / h);
+    return { width: w * scale, height: h * scale };
+}
+
+export function nodeSizeFromRatio(size: string, baseWidth: number, baseHeight: number) {
+    const match = size?.match(/^(\d+)(?:x|:)(\d+)/);
+    if (!match) return null;
+    const width = Number(match[1]);
+    const height = Number(match[2]);
+    const ratio = width / Math.max(1, height);
+    if (ratio < 0.25 || ratio > 4) return { width: baseWidth, height: baseHeight };
+    return ratio >= baseWidth / baseHeight ? { width: baseWidth, height: baseWidth / ratio } : { width: baseHeight * ratio, height: baseHeight };
+}