| 1 | const sleep = (ms) => new Promise(resolve => setTimeout(resolve, ms)); |
| 2 | |
| 3 | const createGenreListWithClickEvent = (genreList, genres, callback) => { |
| 4 | genreList.append(...genres.map((genre) => { |
| 5 | const name = genre["name"]; |
| 6 | const li = document.createElement("li"); |
| 7 | li.setAttribute("data-name", name); |
| 8 | li.addEventListener("click", callback); |
| 9 | li.appendChild(document.createTextNode(name)); |
| 10 | return li; |
| 11 | })); |
| 12 | } |
| 13 | |
| 14 | const relativeToCtx = (x1, x2, y1, y2, ctx) => { |
| 15 | const newX = x1 + x2; |
| 16 | const newY = y1 + y2; |
| 17 | ctx.lineTo(newX, newY); |
| 18 | return [newX, newY]; |
| 19 | } |
| 20 | |
| 21 | /** |
| 22 | * Return (x,y) of canvas |
| 23 | */ |
| 24 | const getDimensions = (canvas) => [canvas.width, canvas.height]; |
| 25 | |
| 26 | /** |
| 27 | * Return (x,y) midpoint of canvas |
| 28 | */ |
| 29 | const getCenter = (canvas) => getDimensions(canvas).map((dim) => dim / 2); |
| 30 | |
| 31 | /** |
| 32 | * Draw champion box and clear background. |
| 33 | */ |
| 34 | const drawWinner = (canvas) => { |
| 35 | const ctx = canvas.getContext("2d"); |
| 36 | const [width, height] = getDimensions(canvas); |
| 37 | const [mid_x, mid_y] = getCenter(canvas); |
| 38 | const rect_width = width * .5; |
| 39 | const rect_height = height * .1; |
| 40 | ctx.strokeRect(mid_x - rect_width / 2, mid_y - rect_height / 2, rect_width, rect_height); |
| 41 | ctx.clearRect(mid_x - rect_width / 2, mid_y - rect_height / 2, rect_width, rect_height); |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * Draws a path in context from the current location to a point xDist * left, yDist * up away from it. |
| 46 | * @param ctx RenderingContext |
| 47 | * @param x, y float current location |
| 48 | * @param x, y float distance away |
| 49 | * @param up, left (-1|1) directions |
| 50 | * @return [newNodeX, newNodeY] |
| 51 | */ |
| 52 | const drawBranchFrom = (ctx, x, y, xDist, yDist, left, up) => { |
| 53 | const newX = x + (xDist * left) |
| 54 | const newY = y + (yDist * up) |
| 55 | ctx.lineTo(x, newY); |
| 56 | ctx.lineTo(newX, newY); |
| 57 | return [newX, newY]; |
| 58 | } |
| 59 | |
| 60 | const drawArtistOnCtx = (ctx, artistName, x, y) => ctx.strokeText(artistName, x, y); |
| 61 | |
| 62 | /** |
| 63 | * Draws paths to the terminal nodes of a round |
| 64 | * @param x, y the point representation of the start of the branch |
| 65 | */ |
| 66 | const drawMatchup = (canvas, x, y, iter, left, artist1, artist2) => { |
| 67 | const ctx = canvas.getContext("2d"); |
| 68 | const [width, height] = getDimensions(canvas); |
| 69 | |
| 70 | const drawBranchUp = (xDist, yDist) => drawBranchFrom(ctx, x, y, xDist, yDist, left, 1); |
| 71 | const drawBranchDown = (xDist, yDist) => drawBranchFrom(ctx, x, y, xDist, yDist, left, -1); |
| 72 | const drawArtist = (artistName, x, y) => drawArtistOnCtx(ctx, artistName, x, y); |
| 73 | |
| 74 | ctx.beginPath(); |
| 75 | ctx.moveTo(x, y); |
| 76 | drawArtist( |
| 77 | artist1["name"], |
| 78 | ...drawBranchUp(width / iter, height / iter) |
| 79 | ); |
| 80 | ctx.moveTo(x, y); |
| 81 | drawArtist( |
| 82 | artist2["name"], |
| 83 | ...drawBranchDown(width / iter, height / iter) |
| 84 | ); |
| 85 | ctx.stroke(); |
| 86 | } |
| 87 | |
| 88 | const drawBracket = (canvas, artists) => { |
| 89 | drawWinner(canvas); |
| 90 | const [mid_x, mid_y] = getCenter(canvas); |
| 91 | const groups = 4; |
| 92 | const rounds = Math.log2(artists.length / groups); |
| 93 | for (let group = 1; group <= groups; group++) { |
| 94 | for (let round = 0; round < rounds; round++) { |
| 95 | const matchup = [artists.shift(), artists.pop()]; |
| 96 | drawMatchup(canvas, mid_x, mid_y, 2 * round, Math.pow(-1, group), ...matchup); |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | window.onload = () => { |
| 102 | const lStorage = window.localStorage; |
| 103 | const genreList = document.getElementById("genre-list"); |
| 104 | const genreInput = document.getElementById("genre-input"); |
| 105 | const genreForm = document.getElementById("genre-form"); |
| 106 | const canvas = document.getElementById("bracket"); |
| 107 | |
| 108 | const createGenreList = (genreList, genres) => { |
| 109 | return createGenreListWithClickEvent(genreList, genres, (e) => { |
| 110 | genreInput.value = e.target.innerText; |
| 111 | genreForm.requestSubmit(); |
| 112 | }) |
| 113 | } |
| 114 | let genres = JSON.parse(lStorage.getItem("genres")) |
| 115 | if (genres === null) { |
| 116 | fetch("http://localhost:8080/genre") |
| 117 | .then((response) => response.text()) |
| 118 | .then((text) => { |
| 119 | window.localStorage.setItem("genres", text); |
| 120 | genres = JSON.parse(text); |
| 121 | createGenreList(genreList, genres); |
| 122 | }); |
| 123 | } else { |
| 124 | createGenreList(genreList, genres); |
| 125 | } |
| 126 | |
| 127 | genreForm.addEventListener("submit", (e) => { |
| 128 | e.preventDefault(); |
| 129 | fetch(encodeURI(`http://localhost:8080/artist/genre?genre_name=${genreInput.value}`)) |
| 130 | .then((response) => response.json()) |
| 131 | .then((data) => drawBracket(canvas, data.slice(0, 33))); |
| 132 | }); |
| 133 | |
| 134 | genreInput.addEventListener("input", (e) => { |
| 135 | const input = e.target; |
| 136 | for (const item of genreList.children) { |
| 137 | item.style.display = item.dataset.name.includes(input.value.toLowerCase()) ? "block" : "none"; |
| 138 | } |
| 139 | }); |
| 140 | genreInput.addEventListener("focus", (e) => { |
| 141 | genreList.style.display = "block"; |
| 142 | }); |
| 143 | genreInput.addEventListener("blur", (e) => { |
| 144 | sleep(150).then(() => genreList.style.display = "none"); |
| 145 | }); |
| 146 | |
| 147 | |
| 148 | canvas.width = window.innerWidth; |
| 149 | canvas.height = window.innerHeight; |
| 150 | drawBracket(canvas, []); |
| 151 | |
| 152 | const bgImg = new Image(); |
| 153 | bgImg.onload = () => { |
| 154 | const ctx = canvas.getContext("2d"); |
| 155 | //ctx.mozImageSmoothingEnabled = false; |
| 156 | //ctx.webkitImageSmoothingEnabled = false; |
| 157 | //ctx.msImageSmoothingEnabled = false; |
| 158 | //ctx.imageSmoothingEnabled = false; |
| 159 | ctx.drawImage( |
| 160 | bgImg, |
| 161 | 0, |
| 162 | 0, |
| 163 | (canvas.width / bgImg.width) * bgImg.width, |
| 164 | (canvas.height / bgImg.height) * bgImg.height |
| 165 | ); |
| 166 | } |
| 167 | |
| 168 | const upload = document.getElementById("image-upload"); |
| 169 | upload.addEventListener("change", (e) => { |
| 170 | bgImg.src = URL.createObjectURL(e.target.files[0]); |
| 171 | }); |
| 172 | } |