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Сделал рисование с сохранением и автозагрузкой между окнами браузера #7

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Сделал рисование с сохранением и автозагрузкой между окнами браузера #7

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16 changes: 16 additions & 0 deletions utip.css
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.brush_button {
width: 30px;
height: 30px;
margin: 2px;
border-radius: 3px;
display: inline-block;
text-align: center;
vertical-align: middle;
}
.brush_button_background {
background: lightgray;
}
.brush_size {
text-align: center;
background: black;
}
38 changes: 38 additions & 0 deletions utip.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Тестовое задание Боровенников</title>
<link rel="stylesheet" type="text/css" href="utip.css"/>
<script src="utip.js"></script>
</head>
<body onload="on_load();">
<div id="canvas_container" style="width: 300px; height: 150px; margin: 5px; border-style: solid">
<canvas id="canvas"></canvas>
</div>
<div id="palette" style="margin: 5px; border-style: groove; width: 300px">
Цвет
<div id="red" class="brush_button" style="background: red" onclick="set_brush('red');"></div>
<div id="green" class="brush_button" style="background: green" onclick="set_brush('green');"></div>
<div id="blue" class="brush_button" style="background: blue" onclick="set_brush('blue');"></div>
<div id="black" class="brush_button" style="background: black" onclick="set_brush('black');"></div>
<div id="gray" class="brush_button" style="background: gray" onclick="set_brush('gray');"></div>
</div>
<div id="brush" style="margin: 5px; border-style: groove; width: 300px">
Кисть
<div id="small" class="brush_button brush_button_background" onclick="set_brush('small');">
<div class="brush_size" style="width: 4px; height: 4px; border-radius: 2px; margin: 13px"></div>
</div>
<div id="medium" class="brush_button brush_button_background" onclick="set_brush('medium');">
<div class="brush_size" style="width: 10px; height: 10px; border-radius: 5px; margin: 10px"></div>
</div>
<div id="large" class="brush_button brush_button_background" onclick="set_brush('large');">
<div class="brush_size" style="width: 20px; height: 20px; border-radius: 10px; margin: 5px"></div>
</div>
</div>
<div id="buttons" style="margin: 5px;">
<button onclick="save_canvas();">Сохранить</button>
<button onclick="clear_canvas();">Очистить</button>
</div>
</body>
</html>
130 changes: 130 additions & 0 deletions utip.js
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function on_load() {
set_brush('red');
set_brush('small');
window.canvas_element = document.getElementById("canvas");
window.ctx = window.canvas_element.getContext('2d');
window.ctx.lineCap = 'round';
window.canvas_element.addEventListener('mousedown', begin_draw);
window.canvas_element.addEventListener('mousemove', continue_draw);
window.canvas_element.addEventListener('mouseup', end_draw);
load_image_data();
window.addEventListener("storage", storage_handler);
}

function storage_handler() {
load_image_data();
}

function set_brush(sender_id) {

var set_color_selection = function () {
['red', 'green', 'blue', 'black', 'gray'].forEach(function (color) {
var button = document.getElementById(color);
if (button) {
if (color == window.selected_color)
button.style.borderStyle = 'solid';
else
button.style.borderStyle = 'inset';
}
});
};

var set_brush_size_selection = function () {
['small', 'medium', 'large'].forEach(function (color) {
var button = document.getElementById(color);
if (button) {
if (color == window.selected_brush)
button.style.borderStyle = 'solid';
else
button.style.borderStyle = 'inset';
}
});
};

switch (sender_id) {
case 'red':
case 'green':
case 'blue':
case 'black':
case 'gray':
window.selected_color = sender_id;
set_color_selection();
break;
case 'small':
case 'medium':
case 'large':
window.selected_brush = sender_id;
set_brush_size_selection();
break;
}
}

function begin_draw(e) {
var size = 0;
switch (window.selected_brush) {
case 'small':
size = 4;
break;
case 'medium':
size = 10;
break;
case 'large':
size = 20;
break;
}
window.ctx.strokeStyle = window.selected_color;
window.drawing = true;
window.ctx.beginPath();
window.ctx.lineWidth = 1;
window.ctx.arc(e.x - window.canvas_element.offsetLeft, e.y - window.canvas_element.offsetTop, size / 2, 0, 2 * Math.PI);
window.ctx.fillStyle = window.selected_color;
window.ctx.fill();
window.ctx.stroke();
window.ctx.beginPath();
window.ctx.moveTo(e.x - window.canvas_element.offsetLeft, e.y - window.canvas_element.offsetTop);
window.ctx.lineWidth = size;
}

function continue_draw(e) {
if (window.drawing) {
window.ctx.lineTo(e.x - window.canvas_element.offsetLeft, e.y - window.canvas_element.offsetTop);
window.ctx.stroke();
window.ctx.beginPath();
window.ctx.moveTo(e.x - window.canvas_element.offsetLeft, e.y - window.canvas_element.offsetTop);
}
}

function end_draw(e) {
window.ctx.fillStyle = window.selected_color;
window.ctx.lineTo(e.x - window.canvas_element.offsetLeft, e.y - window.canvas_element.offsetTop);
window.ctx.stroke();
window.drawing = false;
}

function save_canvas() {
var image_data = window.ctx.getImageData(0, 0, window.canvas_element.width, window.canvas_element.height);
localStorage['utip.canvas'] = image_data.data.toString();
}

function clear_canvas() {
window.ctx.clearRect(0, 0, window.canvas_element.width, window.canvas_element.height);
}

function load_image_data() {
var saved_image_data = localStorage['utip.canvas'];
if (saved_image_data) {
var image_data = window.ctx.getImageData(0, 0, window.canvas_element.width, window.canvas_element.height);
var array = saved_image_data.split(',');
if (array.length == image_data.data.length) {
for (var i = 0; i < array.length; i += 4) {
if (array[i] != '0' || array[i + 1] != '0' || array[i + 2] != '0') {
image_data.data[i] = parseInt(array[i]); //red
image_data.data[i + 1] = parseInt(array[i + 1]); // blue
image_data.data[i + 2] = parseInt(array[i + 2]); // green
image_data.data[i + 3] = parseInt(array[i + 3]); // alpha
}
}
window.ctx.putImageData(image_data, 0, 0);
}
}
}