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index.js
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index.js
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//Get the brush type select field
var type = document.getElementById("brush");
//Keep track of our modals
var modals = [];
//If we need to hide a modal...
function hideModal(id){
//Find the correct id...
for (var i = 0;i<modals.length;i++){
if ( modals[i].id === id ){
modals[i].hide(); //...then hide it.
}
}
}
//These are our brushes - these vars are imported from the ./brushes.js file
var BRUSHES = {
default: DEFAULT_BRUSH,
netted: NETTED,
bubbles: BUBBLES,
sketchy: SKETCHY,
calligraphy: CALLIGRAPHY_BRUSH,
solid: SOLID
};
//The filename for the drawing
var FILENAME = document.getElementById("filename").value;
//An HTML template for the new brush modal
var newBrushHTML = `
<p>
Choose a file with the button below, and we'll add it to your toolbox!
</p>
<input type="file" id="newbrushfile">
`;
//Defin the new brush modal and add it to our modals array
var newBrushModal = new Modal("New Custom Brush", newBrushHTML);
modals.push(newBrushModal);
//Some event listeners
//Listen for a brush change
type.addEventListener("change", function(e) {
//If it's not a new brush, set the brush appropriately
if ( type.value !== "newBrush" ){
CURRENT_TOOL = BRUSHES[type.value];
} else {
//If the user wants to make a new brush, we pop up a modal and ask them to upload an image for it
newBrushModal.show();
}
});
//Listen for a brush size change
document.getElementById("brushSize").addEventListener("change", function(e) {
//Set the brush size
BRUSH_SIZE = document.getElementById("brushSize").value;
});
//For toggling the eraser
function eraserToggle(cb) {
if (cb.checked) {
canvas.eraserOn();
} else {
canvas.eraserOff();
}
}
/*****************
*
* Custom Brush Uploading code
*
*****************/
//Listen for a new brush file change
document.getElementById("newbrushfile").addEventListener("change", function(e){
//Grap the new brush file input
var el = document.getElementById("newbrushfile");
//Get the file
var file = el.files[0];
//Define a file reader
var reader = new FileReader();
//Give a default name
var name = "CustomBrush";
//Run this function when the image is loaded
reader.addEventListener("load", function(e){
//Create a new image
var img = new Image();
//Define it's source
img.src = reader.result;
//Create a brush from the image
var brush = new ImageBrush(img);
//Add the brush to the brushes list and set the current tool
BRUSHES[name] = brush;
CURRENT_TOOL = brush;
//Hide the modal
newBrushModal.hide();
//Reload the brushes
loadBrushes();
});
//Does it have a file?
if (file) {
//Get the brush name
name = file.name;
//Remove the ".extension" at the end
name = name.split(".");
var extension = name.pop();
name.join(".");
//Which extensions are allowed?
var allowedExtensions = {
"png": true,
"jpg": true
};
//If the current extension is allowed...
if (extension.toLowerCase() in allowedExtensions){
reader.readAsDataURL(file);//Read the file into a data url
} else {
//Otherwise, let the user know it's unsupported
alert("Unsupported file type. Please try again.");
}
}
});
//Define a color picker
var colorPicker = new iro.ColorPicker("#color-picker", {
width: 220,
height: 220,
color: "#f00"
});
//Set the global COLOR var on change
colorPicker.on("color:change", function(color) {
COLOR.red = color.rgb.r;
COLOR.green = color.rgb.g;
COLOR.blue = color.rgb.b;
});
//Set the COLOR.alpha whenever the opacity is changed.
var o = document.getElementById("opacity");
o.addEventListener("change", function() {
COLOR.alpha = o.value / 100;
});
//Load Brushes
function loadBrushes() {
//Reset the content of the brush select field
document.getElementById("brush").innerHTML = "";
//For every brush in our object...
for (var i in BRUSHES) {
//Create a new option element
var newEl = document.createElement("option");
//Set it's value to the name of the brush
newEl.value = i;
//Capitalize the first letter of its name for display
var str = i;
var upCase = str.charAt(0).toUpperCase();
str = upCase + str.substr(1, str.length);
//Set the option's textContent
newEl.textContent = str;
//Append the element
document.getElementById("brush").appendChild(newEl);
}
//Create the "Upload Your Own" option and append it
var newBrushOption = document.createElement("option");
newBrushOption.value = 'newBrush';
newBrushOption.textContent = "Upload Your Own";
document.getElementById("brush").appendChild(newBrushOption);
}
//Load the brushes initially
loadBrushes();
//Globals
var CURRENT_TOOL = DEFAULT_BRUSH; //The current tool being used
var BRUSH_SIZE = 10; //The global brush size
//Our COLOR global
var COLOR = {
red: 255,
green: 0,
blue: 0,
alpha: 1
};
//The active layer
var ACTIVE_LAYER = 0;
//Get the dimensions with a prompt
var dimensions = prompt("Please enter dimensions for your drawing, in this format: WIDTHxHEIGHT");
//Split it
dimensions = dimensions.split("x");
//Define width and height
var CANVAS_WIDTH = Number( dimensions[0] );
var CANVAS_HEIGHT = Number( dimensions[1] );
//Create our canvas
var canvas = new Canvas(CANVAS_WIDTH, CANVAS_HEIGHT);
//Zoom it depending on the canvas size
canvas.zoom( -(window.innerWidth - CANVAS_WIDTH)/4 );
//Update the drawing on an interval
window.setInterval(function() {
canvas.draw();
});
//Define the canvas left and top position (used for zooming)
var CANVAS_LEFT = 0;
var CANVAS_TOP = 0;
CANVAS_LEFT = parseFloat(canvas.el.style.left.replace("px", ""));
CANVAS_TOP = parseFloat(canvas.el.style.top.replace("px", ""));
//When the save button is clicked, we save the image
document.getElementById("save").onclick = function() {
canvas.save();
};
//Zoom on mousewheel
document.getElementById("canvas").addEventListener("wheel", function(e) {
e.preventDefault();
CANVAS_LEFT = parseFloat(canvas.el.style.left.replace("px", ""));
CANVAS_TOP = parseFloat(canvas.el.style.top.replace("px", ""));
//This is the most important line
canvas.zoom(e.deltaY);
});
//Keep the rest of the screen from scrolling
document.body.addEventListener("wheel", function(e){
if (e.target === document.body){
e.preventDefault();
}
});
//Grab our controls
var controls = document.getElementById("controls");
//Are we dragging the controls?
var isDragging = false;
//Returns the x and y position of the controls
function getControlsPos() {
var left = controls.style.left.replace("px", "");
var top = controls.style.top.replace("px", "");
return { x: left, y: top };
}
//Defines an x- and y-offset for when we click, to get a smoother drag
var xoff = 0;
var yoff = 0;
//On mouse down...
controls.addEventListener("mousedown", function(e) {
//Get the control coordinates
var coords = getControlsPos();
//If the mouse is in the dragging area...
if (
e.clientX > coords.x &&
e.clientX < coords.x + 400 &&
e.clientY > coords.y &&
e.clientY < coords.y + 25
) {
//We are dragging
isDragging = true;
//Define our offsets
xoff = e.clientX - coords.x;
yoff = e.clientY - coords.y;
}
});
//On mouse up...
document.body.onmouseup = function() {
//We aren't dragging
isDragging = false;
};
//On mouse move...
document.body.onmousemove = function(e) {
//Set the controls x and y to be the mouse x and y minus our offsets
if (isDragging) {
controls.style.left = e.clientX - xoff + "px";
controls.style.top = e.clientY - yoff + "px";
}
};
//For notifications
var NOTIFIER = document.querySelector('.mdl-js-snackbar');
/****************
*
* Layer Editor
*
****************/
//Define the layer editor and add it to our modals
var layerEditor = new Modal("Edit Layers", "<div id='layer-editor' class='mdl-grid'></div>");
modals.push(layerEditor);
//Opens the layer editor
function openLayerEditor(){
loadLayers();
layerEditor.show();
}
//Loads the layers in the canvas to the layer editor
function loadLayers(){
//Clear the layers
document.getElementById("layer-editor").innerHTML = "";
//For each layer in the canvas...
for (var i = 0;i<canvas.layers.length;i++){
//Make a new "cloned" canvas
let c = cloneCanvas(canvas.layers[i].render);
//Set some styles
c.style.width = "100px";
c.style.height = "100px";
c.style.margin = "10px";
c.className = "mdl-cell mdl-cell--3-col";
//Highlight the active layer
if (i === ACTIVE_LAYER){
c.style.border = "solid 3px blue";
}
//Create a copy of i
let _i = i;
//Listen for click
c.addEventListener("click", function(e){
//Set the active layer
canvas.setActiveLayer(_i);
//Reload the layers
loadLayers();
});
//Append the layer
document.getElementById("layer-editor").appendChild(c);
}
//Create the add layer button
var addLayer = document.createElement("div");
//Some styling
addLayer.style.width = "100px";
addLayer.style.height = "100px";
addLayer.style.backgroundColor = "lightgray";
addLayer.style.margin = "10px";
addLayer.style.display = "flex";
addLayer.style.alignItems = "center";
addLayer.style.justifyContent = "center";
//InnerHTML
addLayer.innerHTML = "<i class='material-icons'>add</i>";
//ID and Classname
addLayer.id = "addLayer";
addLayer.className = "mdl-cell mdl-cell--3-col";
//Set the font size
addLayer.style.fontSize = "30px";
//Add and reload the layers on click
addLayer.addEventListener("click", function(){
canvas.addLayer();
loadLayers();
});
//Append the button
document.getElementById("layer-editor").appendChild(addLayer);
}