1 const sleep
= (ms
) => new Promise(resolve
=> setTimeout(resolve
, ms
));
6 const formSubmitPolyfill
= (form
, callback
) => {
7 if (form
.requestSubmit
) {
14 const createGenreListWithClickEvent
= (genreList
, genres
, callback
) => {
15 genreList
.append(...genres
.map((genre
) => {
16 const name
= genre
["name"];
17 const li
= document
.createElement("li");
18 li
.setAttribute("data-name", name
);
19 li
.addEventListener("click", callback
);
20 li
.appendChild(document
.createTextNode(name
));
25 const relativeToCtx
= (x1
, x2
, y1
, y2
, ctx
) => {
28 ctx
.lineTo(newX
, newY
);
33 * Return (x,y) of canvas
35 const getDimensions
= (canvas
) => [canvas
.width
, canvas
.height
];
38 * Return (x,y) midpoint of canvas
40 const getCenter
= (canvas
) => getDimensions(canvas
).map((dim
) => dim
/ 2);
42 const getRectangleDimensionsUnbound
= (canvas
, xScale
, yScale
) => {
43 [width
, height
] = getDimensions(canvas
);
44 return [width
* xScale
, height
* yScale
];
47 const getRectangleDimensions
= (canvas
) => getRectangleDimensionsUnbound(canvas
, .5, .1);
50 * Draw champion box and clear background.
52 const drawWinner
= (canvas
) => {
53 const ctx
= canvas
.getContext("2d");
54 const [width
, height
] = getDimensions(canvas
);
55 const [mid_x
, mid_y
] = getCenter(canvas
);
56 const [rect_width
, rect_height
] = getRectangleDimensions(canvas
);
57 ctx
.strokeRect(mid_x
- rect_width
/ 2, mid_y
- rect_height
/ 2, rect_width
, rect_height
);
58 ctx
.clearRect(mid_x
- rect_width
/ 2, mid_y
- rect_height
/ 2, rect_width
, rect_height
);
62 * Draws a path in context from the current location to a point xDist * left, yDist * up away from it.
63 * @param ctx RenderingContext
64 * @param x, y float current location
65 * @param x, y float distance away
66 * @param up, left (-1|1) directions
67 * @return [newNodeX, newNodeY]
69 const drawBranchFrom
= (ctx
, x
, y
, xDist
, yDist
, left
, up
) => {
70 const newX
= x
+ (xDist
* left
)
71 const newY
= y
+ (yDist
* up
)
73 ctx
.lineTo(newX
, newY
);
77 const drawArtistOnCtx
= (ctx
, artistName
, x
, y
) => ctx
.strokeText(artistName
, x
, y
);
80 * Draws paths to the terminal nodes of a round
81 * @param x, y the point representation of the start of the branch
83 const drawMatchup
= (canvas
, x
, y
, iter
, left
, artist1
, artist2
) => {
84 const ctx
= canvas
.getContext("2d");
85 const [width
, height
] = getDimensions(canvas
);
87 const drawBranchUp
= (xDist
, yDist
) => drawBranchFrom(ctx
, x
, y
, xDist
, yDist
, left
, 1);
88 const drawBranchDown
= (xDist
, yDist
) => drawBranchFrom(ctx
, x
, y
, xDist
, yDist
, left
, -1);
89 const drawArtist
= (artistName
, x
, y
) => drawArtistOnCtx(ctx
, artistName
, x
, y
);
95 ...drawBranchUp(width
/ iter
, height
/ iter
)
100 ...drawBranchDown(width
/ iter
, height
/ iter
)
105 const drawBracket
= (canvas
, artists
) => {
107 const [mid_x
, mid_y
] = getCenter(canvas
);
108 const [rect_width
, rect_height
] = getRectangleDimensions(canvas
);
110 const rounds
= Math
.log2(artists
.length
/ groups
);
111 for (let group
= 1; group
<= groups
; group
++) {
112 for (let round
= 0; round
< rounds
; round
++) {
113 const matchup
= [artists
.shift(), artists
.pop()];
114 drawMatchup(canvas
, mid_x
, mid_y
, 2 * round
, Math
.pow(-1, group
), ...matchup
);
119 window
.onload
= () => {
120 const lStorage
= window
.localStorage
;
121 const genreList
= document
.getElementById("genre-list");
122 const genreInput
= document
.getElementById("genre-input");
123 const genreForm
= document
.getElementById("genre-form");
124 const canvas
= document
.getElementById("bracket");
126 const formSubmitAction
= () => {
127 fetch(encodeURI(`http://localhost:8080/artist/genre?genre_name=${genreInput.value}`))
128 .then((response
) => response
.json())
129 .then((data
) => drawBracket(canvas
, data
.slice(0, 33)));
132 const createGenreList
= (genreList
, genres
) => {
133 return createGenreListWithClickEvent(genreList
, genres
, (e
) => {
134 genreInput
.value
= e
.target
.innerText
;
135 formSubmitPolyfill(genreForm
, formSubmitAction
);
138 let genres
= JSON
.parse(lStorage
.getItem("genres"))
139 if (genres
=== null) {
140 fetch("http://localhost:8080/genre")
141 .then((response
) => response
.text())
143 window
.localStorage
.setItem("genres", text
);
144 genres
= JSON
.parse(text
);
145 createGenreList(genreList
, genres
);
148 createGenreList(genreList
, genres
);
151 genreForm
.addEventListener("submit", (e
) => {
156 genreInput
.addEventListener("input", (e
) => {
157 const input
= e
.target
;
158 Array
.from(genreList
.children
).forEach((item
) => item
.style
.display
= item
.dataset
.name
.includes(input
.value
.toLowerCase()) ? "block" : "none");
160 genreInput
.addEventListener("focus", (e
) => {
161 genreList
.style
.display
= "block";
163 genreInput
.addEventListener("blur", (e
) => {
164 sleep(150).then(() => genreList
.style
.display
= "none");
168 canvas
.width
= window
.innerWidth
;
169 canvas
.height
= window
.innerHeight
;
170 drawBracket(canvas
, []);
172 const bgImg
= new Image();
173 bgImg
.onload
= () => {
174 const ctx
= canvas
.getContext("2d");
175 //ctx.mozImageSmoothingEnabled = false;
176 //ctx.webkitImageSmoothingEnabled = false;
177 //ctx.msImageSmoothingEnabled = false;
178 //ctx.imageSmoothingEnabled = false;
183 (canvas
.width
/ bgImg
.width
) * bgImg
.width
,
184 (canvas
.height
/ bgImg
.height
) * bgImg
.height
188 const upload
= document
.getElementById("image-upload");
189 upload
.addEventListener("change", (e
) => {
190 bgImg
.src
= URL
.createObjectURL(e
.target
.files
[0]);