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Markdown-ish syntax for generating flowcharts, mindmaps, sequence diagrams, class diagrams, gantt charts, git graphs and more.
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{
"version": 3,
"sources": ["../../../src/utils/lineWithOffset.ts"],
"sourcesContent": ["import type { EdgeData, Point } from '../types.js';\n\n// We need to draw the lines a bit shorter to avoid drawing\n// under any transparent markers.\n// The offsets are calculated from the markers' dimensions.\nconst markerOffsets = {\n aggregation: 18,\n extension: 18,\n composition: 18,\n dependency: 6,\n lollipop: 13.5,\n arrow_point: 4,\n} as const;\n\n/**\n * Calculate the deltas and angle between two points\n * @param point1 - First point\n * @param point2 - Second point\n * @returns The angle, deltaX and deltaY\n */\nfunction calculateDeltaAndAngle(\n point1?: Point | [number, number],\n point2?: Point | [number, number]\n): { angle: number; deltaX: number; deltaY: number } {\n if (point1 === undefined || point2 === undefined) {\n return { angle: 0, deltaX: 0, deltaY: 0 };\n }\n point1 = pointTransformer(point1);\n point2 = pointTransformer(point2);\n const [x1, y1] = [point1.x, point1.y];\n const [x2, y2] = [point2.x, point2.y];\n const deltaX = x2 - x1;\n const deltaY = y2 - y1;\n return { angle: Math.atan(deltaY / deltaX), deltaX, deltaY };\n}\n\nconst pointTransformer = (data: Point | [number, number]) => {\n if (Array.isArray(data)) {\n return { x: data[0], y: data[1] };\n }\n return data;\n};\n\nexport const getLineFunctionsWithOffset = (\n edge: Pick\n) => {\n return {\n x: function (\n this: void,\n d: Point | [number, number],\n i: number,\n data: (Point | [number, number])[]\n ) {\n let offset = 0;\n const DIRECTION =\n pointTransformer(data[0]).x < pointTransformer(data[data.length - 1]).x ? 'left' : 'right';\n if (i === 0 && Object.hasOwn(markerOffsets, edge.arrowTypeStart)) {\n const { angle, deltaX } = calculateDeltaAndAngle(data[0], data[1]);\n offset =\n markerOffsets[edge.arrowTypeStart as keyof typeof markerOffsets] *\n Math.cos(angle) *\n (deltaX >= 0 ? 1 : -1);\n } else if (i === data.length - 1 && Object.hasOwn(markerOffsets, edge.arrowTypeEnd)) {\n const { angle, deltaX } = calculateDeltaAndAngle(\n data[data.length - 1],\n data[data.length - 2]\n );\n offset =\n markerOffsets[edge.arrowTypeEnd as keyof typeof markerOffsets] *\n Math.cos(angle) *\n (deltaX >= 0 ? 1 : -1);\n }\n\n const differenceToEnd = Math.abs(\n pointTransformer(d).x - pointTransformer(data[data.length - 1]).x\n );\n const differenceInYEnd = Math.abs(\n pointTransformer(d).y - pointTransformer(data[data.length - 1]).y\n );\n const differenceToStart = Math.abs(pointTransformer(d).x - pointTransformer(data[0]).x);\n const differenceInYStart = Math.abs(pointTransformer(d).y - pointTransformer(data[0]).y);\n const startMarkerHeight = markerOffsets[edge.arrowTypeStart as keyof typeof markerOffsets];\n const endMarkerHeight = markerOffsets[edge.arrowTypeEnd as keyof typeof markerOffsets];\n const extraRoom = 1;\n\n // Adjust the offset if the difference is smaller than the marker height\n if (\n differenceToEnd < endMarkerHeight &&\n differenceToEnd > 0 &&\n differenceInYEnd < endMarkerHeight\n ) {\n let adjustment = endMarkerHeight + extraRoom - differenceToEnd;\n adjustment *= DIRECTION === 'right' ? -1 : 1;\n // Adjust the offset by the amount needed to fit the marker\n offset -= adjustment;\n }\n\n if (\n differenceToStart < startMarkerHeight &&\n differenceToStart > 0 &&\n differenceInYStart < startMarkerHeight\n ) {\n let adjustment = startMarkerHeight + extraRoom - differenceToStart;\n adjustment *= DIRECTION === 'right' ? -1 : 1;\n offset += adjustment;\n }\n\n return pointTransformer(d).x + offset;\n },\n y: function (\n this: void,\n d: Point | [number, number],\n i: number,\n data: (Point | [number, number])[]\n ) {\n let offset = 0;\n const DIRECTION =\n pointTransformer(data[0]).y < pointTransformer(data[data.length - 1]).y ? 'down' : 'up';\n if (i === 0 && Object.hasOwn(markerOffsets, edge.arrowTypeStart)) {\n const { angle, deltaY } = calculateDeltaAndAngle(data[0], data[1]);\n offset =\n markerOffsets[edge.arrowTypeStart as keyof typeof markerOffsets] *\n Math.abs(Math.sin(angle)) *\n (deltaY >= 0 ? 1 : -1);\n } else if (i === data.length - 1 && Object.hasOwn(markerOffsets, edge.arrowTypeEnd)) {\n const { angle, deltaY } = calculateDeltaAndAngle(\n data[data.length - 1],\n data[data.length - 2]\n );\n offset =\n markerOffsets[edge.arrowTypeEnd as keyof typeof markerOffsets] *\n Math.abs(Math.sin(angle)) *\n (deltaY >= 0 ? 1 : -1);\n }\n\n const differenceToEnd = Math.abs(\n pointTransformer(d).y - pointTransformer(data[data.length - 1]).y\n );\n const differenceInXEnd = Math.abs(\n pointTransformer(d).x - pointTransformer(data[data.length - 1]).x\n );\n const differenceToStart = Math.abs(pointTransformer(d).y - pointTransformer(data[0]).y);\n const differenceInXStart = Math.abs(pointTransformer(d).x - pointTransformer(data[0]).x);\n const startMarkerHeight = markerOffsets[edge.arrowTypeStart as keyof typeof markerOffsets];\n const endMarkerHeight = markerOffsets[edge.arrowTypeEnd as keyof typeof markerOffsets];\n const extraRoom = 1;\n\n // Adjust the offset if the difference is smaller than the marker height\n if (\n differenceToEnd < endMarkerHeight &&\n differenceToEnd > 0 &&\n differenceInXEnd < endMarkerHeight\n ) {\n let adjustment = endMarkerHeight + extraRoom - differenceToEnd;\n adjustment *= DIRECTION === 'up' ? -1 : 1;\n // Adjust the offset by the amount needed to fit the marker\n offset -= adjustment;\n }\n\n if (\n differenceToStart < startMarkerHeight &&\n differenceToStart > 0 &&\n differenceInXStart < startMarkerHeight\n ) {\n let adjustment = startMarkerHeight + extraRoom - differenceToStart;\n adjustment *= DIRECTION === 'up' ? -1 : 1;\n offset += adjustment;\n }\n return pointTransformer(d).y + offset;\n },\n };\n};\n\nif (import.meta.vitest) {\n const { it, expect, describe } = import.meta.vitest;\n describe('calculateDeltaAndAngle', () => {\n it('should calculate the angle and deltas between two points', () => {\n expect(calculateDeltaAndAngle([0, 0], [0, 1])).toStrictEqual({\n angle: 1.5707963267948966,\n deltaX: 0,\n deltaY: 1,\n });\n expect(calculateDeltaAndAngle([1, 0], [0, -1])).toStrictEqual({\n angle: 0.7853981633974483,\n deltaX: -1,\n deltaY: -1,\n });\n expect(calculateDeltaAndAngle({ x: 1, y: 0 }, [0, -1])).toStrictEqual({\n angle: 0.7853981633974483,\n deltaX: -1,\n deltaY: -1,\n });\n expect(calculateDeltaAndAngle({ x: 1, y: 0 }, { x: 1, y: 0 })).toStrictEqual({\n angle: NaN,\n deltaX: 0,\n deltaY: 0,\n });\n });\n\n it('should calculate the angle and deltas if one point in undefined', () => {\n expect(calculateDeltaAndAngle(undefined, [0, 1])).toStrictEqual({\n angle: 0,\n deltaX: 0,\n deltaY: 0,\n });\n expect(calculateDeltaAndAngle([0, 1], undefined)).toStrictEqual({\n angle: 0,\n deltaX: 0,\n deltaY: 0,\n });\n });\n });\n}\n"],
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