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98
frontend/app/agents/workflows/HelperLines.tsx
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98
frontend/app/agents/workflows/HelperLines.tsx
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/*
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┌──────────────────────────────────────────────────────────────────────────────┐
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│ @author: Davidson Gomes │
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│ @file: /app/agents/workflows/HelperLines.tsx │
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│ Developed by: Davidson Gomes │
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│ Creation date: May 13, 2025 │
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│ Contact: contato@evolution-api.com │
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├──────────────────────────────────────────────────────────────────────────────┤
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│ @copyright © Evolution API 2025. All rights reserved. │
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│ Licensed under the Apache License, Version 2.0 │
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│ │
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│ You may not use this file except in compliance with the License. │
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│ You may obtain a copy of the License at │
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│ │
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│ http://www.apache.org/licenses/LICENSE-2.0 │
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│ │
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│ Unless required by applicable law or agreed to in writing, software │
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│ distributed under the License is distributed on an "AS IS" BASIS, │
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│ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. │
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│ See the License for the specific language governing permissions and │
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│ limitations under the License. │
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├──────────────────────────────────────────────────────────────────────────────┤
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│ @important │
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│ For any future changes to the code in this file, it is recommended to │
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│ include, together with the modification, the information of the developer │
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│ who changed it and the date of modification. │
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└──────────────────────────────────────────────────────────────────────────────┘
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*/
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import { ReactFlowState, useStore } from "@xyflow/react";
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import { CSSProperties, useEffect, useRef } from "react";
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const canvasStyle: CSSProperties = {
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width: "100%",
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height: "100%",
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position: "absolute",
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zIndex: 10,
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pointerEvents: "none",
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};
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const storeSelector = (state: ReactFlowState) => ({
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width: state.width,
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height: state.height,
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transform: state.transform,
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});
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export type HelperLinesProps = {
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horizontal?: number;
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vertical?: number;
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};
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// a simple component to display the helper lines
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// it puts a canvas on top of the React Flow pane and draws the lines using the canvas API
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function HelperLinesRenderer({ horizontal, vertical }: HelperLinesProps) {
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const { width, height, transform } = useStore(storeSelector);
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const canvasRef = useRef<HTMLCanvasElement>(null);
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useEffect(() => {
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const canvas = canvasRef.current;
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const ctx = canvas?.getContext("2d");
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if (!ctx || !canvas) {
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return;
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}
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const dpi = window.devicePixelRatio;
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canvas.width = width * dpi;
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canvas.height = height * dpi;
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ctx.scale(dpi, dpi);
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ctx.clearRect(0, 0, width, height);
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ctx.strokeStyle = "#1d5ade";
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ctx.lineWidth = 1;
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ctx.setLineDash([5, 5]);
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if (typeof vertical === "number") {
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ctx.moveTo(vertical * transform[2] + transform[0], 0);
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ctx.lineTo(vertical * transform[2] + transform[0], height);
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ctx.stroke();
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}
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if (typeof horizontal === "number") {
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ctx.moveTo(0, horizontal * transform[2] + transform[1]);
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ctx.lineTo(width, horizontal * transform[2] + transform[1]);
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ctx.stroke();
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}
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}, [width, height, transform, horizontal, vertical]);
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return (
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<canvas
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ref={canvasRef}
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className="react-flow__canvas"
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style={canvasStyle}
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/>
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);
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}
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export default HelperLinesRenderer;
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