labels init

master
km0 3 years ago
commit 5d6490eac3

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<script src="script.js" defer></script>
<link rel="stylesheet" href="style.css" />
<title>Concrete Label</title>
</head>
<body>
<div id="container">
<div id="editor"></div>
</div>
</body>
</html>

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// Get the container to use as a canvas
const container = document.getElementById("container");
const editor = document.getElementById("editor");
// List of labels
let labels = [];
let closing = false;
// Start is where the mouse is pressed, End is where the mouse is released
let startX;
let startY;
let endX;
let endY;
// Minimum size for the label to be created
let minimumSizeX = 25;
let minimumSizeY = 25;
// Boolean for showing the editor during drawing
let showEditor = false;
// Store the coordinates and trigger the function
container.addEventListener("mousedown", (e) => {
if (e.target.tagName !== "BUTTON") {
startX = e.x;
startY = e.y;
// activate the editor
showEditor = true;
editor.classList.add("show-editor");
}
});
container.addEventListener("mouseup", (e) => {
if (e.target.tagName !== "BUTTON") {
endX = e.x;
endY = e.y;
// disable the editor
showEditor = false;
editor.classList.remove("show-editor");
editor.style.width = 0;
editor.style.height = 0;
// draw label
drawLabel();
}
});
// Edit the editor box using transform instead of left / top in order to be more efficient
// (but still with width and height ehm idk if this affects the performance a lot)
// (and it is something we must care of because this event is called like every frame that the mouse is dragged)
container.addEventListener("mousemove", (e) => {
if (showEditor) {
let minX = Math.min(startX, e.x);
let minY = Math.min(startY, e.y);
let maxX = Math.max(startX, e.x);
let maxY = Math.max(startY, e.y);
let width = maxX - minX;
let height = maxY - minY;
// Apply a different class when the sizes pass the minimum size
// (i don't know if is good made like this)
if (width > minimumSizeX && height > minimumSizeY) {
editor.classList.add("can-draw");
} else {
editor.classList.remove("can-draw");
}
editor.style.transform = `translate(${minX}px, ${minY}px)`;
editor.style.width = `${maxX - minX}px`;
editor.style.height = `${maxY - minY}px`;
}
});
// Check the mouse direction and create the Label
// The origin points of the label (because is positioned with top left) are always the lowest x and y values
// The width and height are the greater x and y values (because width and height cannot be negative)
function drawLabel() {
let minX = Math.min(startX, endX);
let minY = Math.min(startY, endY);
let maxX = Math.max(startX, endX);
let maxY = Math.max(startY, endY);
let width = maxX - minX;
let height = maxY - minY;
if (width > minimumSizeX && height > minimumSizeY) {
// Create a label and push it into the array of labels
// The index is +1 because it is
let label = createLabel(minX, minY, width, height, labels.length);
labels.push(label);
container.appendChild(label);
}
}
// Create the label element
function createLabel(x, y, width, height, index) {
let label = document.createElement("div");
label.classList.add("label");
label.style.left = `${x}px`;
label.style.top = `${y}px`;
label.style.width = `${width}px`;
label.style.height = `${height}px`;
// data attribute index maybe we will need it later maybe not
// with the index number of the label
label.setAttribute("data-index", index);
// Insert the number in the label
let labelNumber = document.createElement("p");
labelNumber.classList.add("label--number");
labelNumber.innerHTML = index + 1;
label.appendChild(labelNumber);
// Add a button for deleting the label
// TODO: reactive numbering oh no
let close = document.createElement("button");
close.classList.add("label--close");
close.innerHTML = "x";
close.addEventListener("click", (e) => {
label.remove();
});
label.appendChild(close);
return label;
}

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html,
body {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
}
#container {
width: 100%;
height: 100vh;
background-color: #fcc;
}
#editor {
position: absolute;
display: none;
border: 1px solid white;
opacity: 0.5;
width: 0;
height: 0;
z-index: 100;
}
#editor.can-draw {
opacity: 1;
}
#editor.show-editor {
display: block;
}
.label {
position: absolute;
background-color: tomato;
box-shadow: 0px 0px 8px 0px rgba(0, 0, 0, 0.2);
}
.label--number {
display: inline-block;
margin: 0;
padding: 0 4px;
user-select: none;
background-color: white;
}
.label--close {
position: absolute;
right: 0;
border: none;
padding: 0 4px;
font-size: 1rem;
background: none;
color: white;
cursor: pointer;
}
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