/
index.js
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/
index.js
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import Lux from "./src/lux.js"
import Bbox from "./src/bbox.js"
import current_sha from "./scripts/current_sha.js";
function renderer(object) {
if (object.kind === "text") {
let {text, x, y} = object;
if (object.color) {
lux.ctx.fillStyle=object.color;
}
lux.ctx.font = object.font;
lux.ctx.fillText(text, x, y);
} else if (object.kind === "graph") {
lux.ctx.beginPath();
let is_first = true;
for (let {x,y} of object.points) {
if (is_first) {
lux.ctx.moveTo(x, y);
is_first = false;
} else {
lux.ctx.lineTo(x, y);
}
}
lux.ctx.strokeStyle = object.color;
lux.ctx.stroke();
}
}
let lux = new Lux(document.querySelector("#canvas"), renderer);
window.lux = lux;
lux.width = 500;
lux.height = 500;
lux.viewport = new Bbox(0, 0, 100, 100);
var object_idx = 0;
var text_cache = {};
function draw_text(lux, text, x, y, color, font) {
let measured;
let found = (text_cache[font + text]);
if (found) {
measured=found;
} else {
lux.ctx.font = font;
measured = lux.ctx.measureText(text);
text_cache[font + text] = measured;
}
let w = measured.width;
let h = measured.actualBoundingBoxAscent + measured.actualBoundingBoxDescent + 1;
let box = new Bbox(x, y, x + w, y + h);
box.text = text;
box.x = x;
box.y = y;
box.kind = "text";
box.idx = object_idx++;
box.color=color;
box.font=font;
return box
}
function draw_graph(lux, color, points) {
let min_x = Infinity;
let min_y = Infinity;
let max_x = -Infinity;
let max_y = -Infinity;
for (let {x, y} of points) {
min_x = Math.min(min_x, x) - 0.5;
max_x = Math.max(max_x, x) + 0.5;
min_y = Math.min(min_y, y) - 0.5;
max_y = Math.max(max_y, y) + 0.5;
}
let box = new Bbox(min_x, min_y, max_x, max_y);
box.kind="graph";
box.points = points;
box.color = color;
box.idx = object_idx++;
return box;
}
var items = [];
var to_add_and_remove = []
lux.add(draw_text(lux, "hash: " + current_sha, 0 , -30));
lux.add(draw_text(lux, "pixel-ratio: " + window.devicePixelRatio, 0 , -20));
for (let o = 0; o < 10; o++) {
for (var k = 0; k < 10; k ++) {
let points = []
for (var i = 0; i < 1000; i ++) {
let y = Math.sin(((i + o * 10 + k) / 200) * 3.14) * 100;
points.push({x:i, y});
if (i % 20 == 0) {
lux.add(draw_graph(lux, `hsl(${(k / 10)*360}, 100%, 50%)`, points));
points = [{x:i, y}];
}
}
}
}
for (let i = 0; i < 100; i++) {
for (let k = 0; k < 100; k++) {
let color = () => `rgba(${Math.random() * 255},${Math.random() * 255},${Math.random() * 255}, ${(Math.random())})`
let font = () => `${10 + (Math.floor(Math.random() * 5 - 3))}pt ${Math.random() > 0.5 ? "sans-serif" : "serif"}`;
let hello = draw_text(lux, "hello", 30 * k, 20 * i, color(), font());
let world = draw_text(lux, "world", 30 * k, 20 * i + 2, color(), font());
if (Math.random() < 0.1) {
to_add_and_remove.push(hello);
to_add_and_remove.push(world);
}
lux.add(hello);
lux.add(world);
}
}
let added = true;
setInterval(function () {
for (var i of to_add_and_remove) {
if (added) {
lux.remove(i)
} else {
lux.add(i)
}
}
added = !added;
}, 1000);
//lux.scene.addBulk(items);
function mouseMoveWhilstDown(target, whileMove) {
function makeWhilst(down, move, up, getEvt) {
let startX = 0;
let startY = 0;
let loss_x = 0;
let loss_y = 0;
var moving = function (event) {
event = getEvt(event);
if (event instanceof MouseEvent) {
let dx = event.movementX / devicePixelRatio;
let dy = event.movementY / devicePixelRatio;
whileMove(dx, dy);
} else {
let dx = event.screenX - startX;
let dy = event.screenY - startY;
startX = event.screenX;
startY = event.screenY;
whileMove(dx, dy);
}
}
var endMove = function () {
window.removeEventListener(move, moving);
window.removeEventListener(up, endMove);
document.body.style["user-select"] = "auto";
document.exitPointerLock();
};
target.oncontextmenu = function () {
return false;
}
target.addEventListener(down, function (event) {
if (event instanceof MouseEvent) {
//console.log(lux.canvas.requestPointerLock());
}
event.stopPropagation();
event.preventDefault();
startX = getEvt(event).screenX;
startY = getEvt(event).screenY;
document.body.style["user-select"] = "none";
window.addEventListener(move, moving);
window.addEventListener(up, endMove);
});
}
makeWhilst('mousedown', 'mousemove', 'mouseup', event => event);
makeWhilst('touchstart', 'touchmove', 'touchend', event => event.changedTouches[0]);
}
mouseMoveWhilstDown(lux.canvas, function(dx, dy){
let {xrat, yrat} = lux.rats();
dx /= xrat;
dy /= yrat;
lux.viewport = lux.viewport.translate(-dx, -dy);
});
var stopped = false;
function loop(){
//lux.clear();
lux.draw();
if (!stopped) {
requestAnimationFrame(loop);
}
}
loop();
lux.canvas.addEventListener('wheel', function (event) {
event.preventDefault();
let scale = event.deltaY / 200;
if (scale < 0) {
scale = 0.9;
} else {
scale = 1 / 0.9;
}
let new_width = lux.viewport.width * scale;
let new_height = lux.viewport.height * scale;
let delta_w = lux.viewport.width - new_width;
let delta_h = lux.viewport.height - new_height;
let new_x = lux.viewport.minX + delta_w / 2;
let new_y = lux.viewport.minY + delta_h / 2;
new_height = (lux.height / lux.width) * new_width;
lux.viewport = new Bbox(new_x, new_y, 0, 0);
lux.viewport.width = new_width;
lux.viewport.height = new_height;
});
window.onresize = function () {
lux.width = window.innerWidth;
lux.height = window.innerHeight;
let vp = lux.viewport.clone();
vp.width = window.innerWidth / 5;
vp.height = window.innerHeight / 5;
lux.viewport = vp;
}
window.onresize();