components: implement basic selection algorithm
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@ -16,7 +16,7 @@ export default function App(): JSX.Element {
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<Board
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numRows={10}
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numCols={10}
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numLines={5}
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numLines={1}
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/>
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</div>
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<div />
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@ -9,6 +9,11 @@ export type Point = {
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y: number;
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}
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type Selection = {
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start: Point;
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end: Point;
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}
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interface IBoardProps {
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numRows: number;
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numCols: number;
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@ -17,52 +22,54 @@ interface IBoardProps {
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interface IBoardState {
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cells: string[][];
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lines: boolean[];
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selections: Selection[];
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isSelecting: boolean;
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startPos: Point;
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endPos: Point;
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start: Point;
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end: Point;
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}
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const Point0: Point = {x: 0, y: 0};
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const Selection0: Selection = {start: Point0, end: Point0};
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export default class Board extends React.Component<IBoardProps, IBoardState> {
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constructor(props: IBoardProps) {
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super(props);
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this.state = {
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cells: Array(props.numCols).fill(Array(props.numRows).fill('A')),
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lines: Array(props.numLines).fill(false),
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selections: Array(props.numLines).fill(Selection0),
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isSelecting: false,
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startPos: {x: 0, y: 0},
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endPos: {x: 0, y: 0},
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start: Point0,
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end: Point0,
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}
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}
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moveIsValid(pos: Point): boolean {
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const x = Math.abs(pos.x - this.state.startPos.x);
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const y = Math.abs(pos.y - this.state.startPos.y);
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const x = Math.abs(pos.x - this.state.start.x);
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const y = Math.abs(pos.y - this.state.start.y);
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const lineIsValid = x === 0 || y === 0 || x === y;
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return this.state.isSelecting && lineIsValid;
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}
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handleMouseDown(startPos: Point) {
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const endPos = startPos;
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let lines = [...this.state.lines];
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lines[0] = true;
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this.setState({...this.state, startPos, endPos, lines, isSelecting: true});
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handleMouseDown(start: Point) {
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const end = start;
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let selections = [...this.state.selections];
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this.setState({...this.state, start, end, selections, isSelecting: true});
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}
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handleMouseUp(endPos: Point) {
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if (!this.moveIsValid(endPos))
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handleMouseUp(end: Point) {
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if (!this.moveIsValid(end))
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return;
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this.setState({...this.state, endPos, isSelecting: false});
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this.setState({...this.state, end, isSelecting: false});
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}
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handleMouseOver(endPos: Point) {
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if (!this.moveIsValid(endPos))
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handleMouseOver(end: Point) {
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if (!this.moveIsValid(end))
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return;
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this.setState({...this.state, endPos});
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this.setState({...this.state, end});
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}
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renderCell(s: string, pos: Point): JSX.Element {
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@ -83,8 +90,8 @@ export default class Board extends React.Component<IBoardProps, IBoardState> {
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return (
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<Line
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key={`Line${x}`}
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startPos={{...this.state.startPos}}
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endPos={{...this.state.endPos}}
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startPos={{...this.state.start}}
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endPos={{...this.state.end}}
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cellSize={60}
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/>
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);
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@ -96,7 +103,7 @@ export default class Board extends React.Component<IBoardProps, IBoardState> {
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oy.map((s, x) =>
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this.renderCell(s, {x, y})));
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let lines = this.state.lines.filter(x => x).map((ox, x) =>
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let lines = this.state.selections.filter(x => x).map((ox, x) =>
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this.renderLine(x));
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return (
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@ -1,5 +1,11 @@
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.Line {
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stroke: red;
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stroke-width: 10px;
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opacity: 0.3;
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stroke: #8b8be5;
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stroke-width: 5px;
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fill: none;
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}
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.Line2 {
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stroke: #d6a54d;
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stroke-width: 5px;
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fill: none;
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}
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@ -4,6 +4,18 @@ import {Point} from '../Board/Board'
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import './Line.scss';
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enum Direction {
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None = 0,
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Up = 1,
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Down = 2,
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Left = 10,
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LeftUp = 11,
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LeftDown = 12,
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Right = 20,
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RightUp = 21,
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RightDown = 22,
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}
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interface ILineProps {
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startPos: Point;
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endPos: Point;
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@ -12,14 +24,103 @@ interface ILineProps {
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export default function Line(props: ILineProps): JSX.Element {
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const pos = (v: number) => v * props.cellSize + props.cellSize / 2;
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const dir = (v: number) => v < 0 ? 2 : v > 0 ? 1 : 0;
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const offset = 2.5;
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const margin = 30;
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let [x, y, w, h, t] = [0, 0, 0, 0, ''];
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const ox = dir(props.startPos.x - props.endPos.x);
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const oy = dir(props.startPos.y - props.endPos.y);
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const d = Number(`${ox}${oy}`) as Direction;
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switch (d) {
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case Direction.None:
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break;
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case Direction.Up:
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x = pos(props.endPos.x) - margin + offset;
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y = pos(props.endPos.y) - margin + offset;
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w = 55;
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h = pos(props.startPos.y - props.endPos.y +1) - margin - offset * 2;
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t = '';
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break;
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case Direction.Down:
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x = pos(props.startPos.x) - margin + offset;
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y = pos(props.startPos.y) - margin + offset;
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w = 55;
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h = pos(props.endPos.y - props.startPos.y +1) - margin - offset * 2;
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t = '';
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break;
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case Direction.Left:
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x = pos(props.endPos.x) - margin + offset;
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y = pos(props.endPos.y) - margin + offset;
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w = pos(props.startPos.x - props.endPos.x +1) - margin - offset * 2;
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h = 55;
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t = '';
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break;
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case Direction.LeftUp:
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x = pos(props.endPos.x-1) + margin;
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y = pos(props.endPos.y) - margin + offset;
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w = props.startPos.x - props.endPos.x;
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w = pos(w) + (margin - offset * 2) + w * (margin - offset * 2);
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h = 55;
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t = `translate(29,-14),rotate(45, ${x-offset}, ${y+offset})`
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break;
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case Direction.LeftDown:
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x = pos(props.endPos.x-1) + margin;
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y = pos(props.endPos.y) - margin + offset;
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w = props.startPos.x - props.endPos.x;
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w = pos(w) + (margin - offset * 2) + w * (margin - offset * 2);
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h = 55;
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t = `translate(-12,27),rotate(-45, ${x+offset}, ${y-offset})`
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break;
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case Direction.Right:
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x = pos(props.startPos.x) - margin + offset;
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y = pos(props.startPos.y) - margin + offset;
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w = pos(props.endPos.x - props.startPos.x +1) - margin - offset * 2;
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h = 55;
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t = '';
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break;
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case Direction.RightUp:
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x = pos(props.startPos.x) - margin + offset;
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y = pos(props.startPos.y) - margin + offset;
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w = props.endPos.x - props.startPos.x;
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w = pos(w) + (margin - offset * 2) + w * (margin - offset * 2);
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h = 55;
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t = `translate(-9, 29),rotate(-45, ${x-offset}, ${y+offset})`
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break;
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case Direction.RightDown:
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x = pos(props.startPos.x) - margin + offset;
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y = pos(props.startPos.y) - margin + offset;
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w = props.endPos.x - props.startPos.x;
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w = pos(w) + (margin - offset * 2) + w * (margin - offset * 2);
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h = 55;
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t = `translate(27, -14),rotate(45, ${x-offset}, ${y+offset})`
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break;
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}
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return (
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<line
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className="Line"
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x1={`${pos(props.endPos.x)}`}
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y1={`${pos(props.endPos.y)}`}
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x2={`${pos(props.startPos.x)}`}
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y2={`${pos(props.startPos.y)}`}
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<svg>
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<rect
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className="Line2"
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x={x}
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y={y}
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width={w}
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height={h}
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/>
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<rect
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className="Line"
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x={x}
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y={y}
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width={w}
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height={h}
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transform={t}
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rx={margin - offset}
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ry={margin - offset}
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/>
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<circle cx={x} cy={y} r="5" fill="orange" />
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<circle cx={x+w} cy={y+h} r="5" fill="red" />
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</svg>
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);
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}
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