90 lines
3.3 KiB
TypeScript
90 lines
3.3 KiB
TypeScript
import type { CanvasNode } from "~/types/canvas";
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import { clamp } from "#shared/general.util";
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export type Direction = 'bottom' | 'top' | 'left' | 'right';
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export type Position = { x: number, y: number };
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export type Box = Position & { w: number, h: number };
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export type Path = {
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path: string;
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from: Position;
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to: Position;
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side: Direction;
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}
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export function edgePos(side: Direction, pos: Position, offset: number): Position {
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switch (side) {
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case "left":
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return {
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x: pos.x - offset,
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y: pos.y
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};
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case "right":
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return {
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x: pos.x + offset,
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y: pos.y
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};
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case "top":
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return {
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x: pos.x,
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y: pos.y - offset
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};
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case "bottom":
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return {
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x: pos.x,
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y: pos.y + offset
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}
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}
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}
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export function getNode(nodes: CanvasNode[], id: string): CanvasNode | undefined
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{
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return nodes.find(e => e.id === id);
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}
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export function posFromDir(e: { minX: number, minY: number, maxX: number, maxY: number }, t: Direction): Position {
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switch (t) {
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case "top":
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return { x: (e.minX + e.maxX) / 2, y: e.minY };
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case "right":
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return { x: e.maxX, y: (e.minY + e.maxY) / 2 };
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case "bottom":
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return { x: (e.minX + e.maxX) / 2, y: e.maxY };
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case "left":
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return { x: e.minX, y: (e.minY + e.maxY) / 2 };
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}
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}
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export function getBbox(node: CanvasNode): { minX: number, minY: number, maxX: number, maxY: number } {
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return { minX: node.x, minY: node.y, maxX: node.x + node.width, maxY: node.y + node.height };
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}
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export function getPath(from: CanvasNode, fromSide: Direction, to: CanvasNode, toSide: Direction): Path | undefined {
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if(from === undefined || to === undefined)
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return;
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const start = posFromDir(getBbox(from), fromSide), end = posFromDir(getBbox(to), toSide);
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return bezier(start, fromSide, end, toSide);
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}
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export function bezier(from: Position, fromSide: Direction, to: Position, toSide: Direction): Path {
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const r = Math.hypot(from.x - to.x, from.y - to.y), o = clamp(r / 2, 70, 150), a = edgePos(fromSide, from, o), s = edgePos(toSide, to, o);
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return {
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path: `M${from.x},${from.y} C${a.x},${a.y} ${s.x},${s.y} ${to.x},${to.y}`,
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from: from,
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to: to,
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side: toSide,
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};
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}
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export function labelCenter(from: CanvasNode, fromSide: Direction, to: CanvasNode, toSide: Direction): string {
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const start = posFromDir(getBbox(from), fromSide), end = posFromDir(getBbox(to), toSide);
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const len = Math.hypot(start.x - end.x, start.y - end.y), offset = clamp(len / 2, 70, 150), b = edgePos(fromSide, start, offset), s = edgePos(toSide, end, offset);
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const center = getCenter(start, end, b, s, 0.5);
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return `translate(${center.x}px, ${center.y}px)`;
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}
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export function getCenter(n: Position, i: Position, r: Position, o: Position, e: number): Position {
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const a = 1 - e, s = a * a * a, l = 3 * e * a * a, c = 3 * e * e * a, u = e * e * e;
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return {
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x: s * n.x + l * r.x + c * o.x + u * i.x,
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y: s * n.y + l * r.y + c * o.y + u * i.y
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};
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}
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export function gridSnap(value: number, grid: number): number
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{
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return Math.round(value / grid) * grid;
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} |