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engine.js
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engine.js
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var ctx;
var fillColor = "blue";
var brushSize = 10;
var mode = "polyfill";
var previousMode = mode;
function init() {
console.log("this is a test!");
setupPalette();
setupButton();
setupFileButton();
canvas = document.getElementById("drawingCanvas");
ctx = canvas.getContext('2d');
//canvas.addEventListener("click", clickHandler);
//canvas.addEventListener("mousemove",clickHandler);
//canvas.addEventListener("touchstart", touchHandler);
if (window.PointerEvent) {
canvas.addEventListener("pointermove", paint);
canvas.addEventListener("pointerdown", touchdown);
canvas.addEventListener("pointerup", touchup);
if (window.navigator.maxTouchPoints > 1) {
}
canvas.addEventListener("mousedown", clickHandler);
// user agent and hardware support multi-touch
} else {
// provide fallback for user agents that do not support Pointer Events
//canvas.addEventListener("mousemove", paint);
}
var slider = document.getElementById("brushSize");
var output = document.getElementById("brushSizeIndicator");
output.innerHTML = slider.value; // Display the default slider value
// Update the current slider value (each time you drag the slider handle)
slider.oninput = function () {
output.innerHTML = this.value;
brushSize = this.value;
}
}
function clickHandler(e) {
console.log("clicked!");
if (mode == "picker") {
setColor(e, ctx, false);
revertMode();
} else if (mode == "polygon") {
console.log("polygon");
polygon(e);
} else if (mode == "bezier") {
console.log("bezier");
bezier(e);
}
}
//function touchHandler(e) {
// getCursorPosition(canvas, e, "blue");
//}
function Point(xval,yval) {
this.x = xval;
this.y = yval;
}
var point = new Point(0,0);
var touchDownPoint = point;
var touchUpPoint = point;
function getCursorPosition(event) {
canv = event.target
const rect = canv.getBoundingClientRect()
const x = event.clientX - rect.left
const y = event.clientY - rect.top
//console.log("x: " + x + " y: " + y)
//ctx.fillStyle = boxColor
var pt = new Point(x,y)
return pt
//ctx.fillRect(x, y, 5, 5);
}
function paint(event) {
if (event.pointerType != "pen") {
//return;
}
switch (mode) {
case "brush":
brush(event)
break;
case "polyfill":
filledShape(event)
case "line":
line(event)
break;
case "bezier":
bezier(event)
break;
default:
break;
}
//e.preventDefault();
}
function touchdown(event) {
if (event.pointerType != "pen") {
//return;
}
switch (mode) {
case "brush":
brush(event)
break;
case "polyfill":
filledShape(event)
case "polygon":
filledShape(event)
case "picker":
clickHandler(event)
break;
case "line":
line(event)
break;
case "bezier":
bezier(event)
break;
default:
break;
}
//e.preventDefault();
}
function touchup(event) {
if (event.pointerType != "pen") {
//return;
}
switch (mode) {
case "brush":
brush(event)
break;
case "polyfill":
filledShape(event)
case "line":
line(event)
break;
case "bezier":
bezier(event)
break;
default:
break;
}
//e.preventDefault();
}
function brush(event) {
const datareadout = document.getElementById("datareadout")
datareadout.innerText = event.pressure + " " + event.clientX + " " + event.clientY;
if (event.buttons > 0) {
const rect = canvas.getBoundingClientRect()
ctx.fillStyle = fillColor;
pressure = event.pressure;
if (pressure < .2)
pressure = .2;
size = brushSize * pressure;
tipOffset = size * .5;
ctx.fillRect(event.clientX - rect.left - tipOffset,
event.clientY - rect.top - tipOffset, size, size);
}
}
function filledShape(event) {
}
function picker(event) {
}
function box(event) {
}
function line(event) {
touchDownPoint = getCursorPosition(event);
}
function bezier(event) {
}
var pointList = new Array();
function polygon(event) {
console.log("start Array");
pointList.push(getCursorPosition(event))
if(pointList.length != 0) {
drawPolygon(ctx);
}
}
function drawPolygon(drawContext) {
pointList.forEach(function(pt,index) {
if(index == 0)
drawContext.moveTo(pt.x,pt.y);
else
drawContext.lineTo(pt.x,pt.y);
});
drawContext.stroke();
}
// Palette ---->
var palCanvas;
var palCtx;
function setupPalette() {
palCanvas = document.getElementById("palette");
palCtx = palCanvas.getContext("2d");
drawPalette()
palCanvas.addEventListener("click", function (e) {
setColor(e, palCtx, true)
}
);
//canvas.addEventListener("click", clickHandler);
}
function movePickedColor(event) {
const colorIndicator = document.getElementById("pickedColor");
colorIndicator.style.position = "absolute";
colorIndicator.style.left = `${event.clientX}px`;
colorIndicator.style.top = `${event.clientY}px`;
}
function setColor(event, canvContext, moveIndicator) {
console.log(fillColor);
//test = event.target;
clickPos = getCursorPosition(event);
clickColor = canvContext.getImageData(clickPos.x, clickPos.y, 1, 1).data;
fillColor = 'rgb(' + clickColor + ')';
ctx.fillColor = clickColor;
datareadoutcolor.innerText = fillColor;
//ctx.fillRect(10,10,20,20);
if (moveIndicator)
movePickedColor(event);
}
function drawPalette() {
const segmentCount = 50;
const hsteps = 20;
const border = 0;
palStep = palCanvas.getAttribute("height") / segmentCount;
palHStep = palCanvas.getAttribute("width") / hsteps;
for (let i = 0; i < segmentCount; i++) {
for (let j = 0; j < hsteps; j++) {
rgbColor = (hslToRgb(i / segmentCount, .5, j / hsteps));
test = 'rgb(' + rgbColor + ')';
palCtx.fillStyle = 'rgb(' + rgbColor + ')';
//palCtx.fillStyle = "blue"
palCtx.fillRect(j * palHStep, i * palStep, palHStep - border, palStep - border)
}
}
}
/**
* Converts an HSL color value to RGB. Conversion formula
* adapted from http://en.wikipedia.org/wiki/HSL_color_space.
* Assumes h, s, and l are contained in the set [0, 1] and
* returns r, g, and b in the set [0, 255].
*
* @param {number} h The hue
* @param {number} s The saturation
* @param {number} l The lightness
* @return {Array} The RGB representation
*/
function hslToRgb(h, s, l) {
var r, g, b;
if (s == 0) {
r = g = b = l; // achromatic
} else {
var hue2rgb = function hue2rgb(p, q, t) {
if (t < 0) t += 1;
if (t > 1) t -= 1;
if (t < 1 / 6) return p + (q - p) * 6 * t;
if (t < 1 / 2) return q;
if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
return p;
}
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hue2rgb(p, q, h + 1 / 3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1 / 3);
}
return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
}
// Save file stuff
// Converts image to canvas; returns new canvas element
function convertImageToCanvas(image) {
var canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
canvas.getContext("2d").drawImage(image, 0, 0);
return canvas;
}
// Converts canvas to an image
function convertCanvasToImage(canvas) {
var image = new Image();
image.src = canvas.toDataURL("image/png");
return image;
}
function setupButton() {
saveButton = document.getElementById('saveButton')
saveButton.onclick = function () {
var image = convertCanvasToImage(canvas);
var anchor = document.createElement('a');
console.log(anchor);
anchor.setAttribute('href', image.src);
anchor.setAttribute('download', 'image.png');
anchor.click();
}
modeRadioButton = document.getElementsByName("mode");
for (var i = 0, max = modeRadioButton.length; i < max; i++) {
modeRadioButton[i].onclick = function () {
setMode(this.value);
}
}
polyfill = document.getElementById(mode)
polyfill.click()
}
function revertMode() {
mode = previousMode;
radioButton = document.getElementById(mode);
radioButton.click()
}
function setMode(value) {
console.log("radio button!" + value)
previousMode = mode;
mode = value;
}
function setupFileButton() {
let fileHandle;
//loadButton = document.getElementById('loadButton')
const fileSelect = document.getElementById("fileSelect"),
fileElem = document.getElementById("fileElem"),
fileList = document.getElementById("fileList");
fileSelect.addEventListener("click", function (e) {
if (fileElem) {
fileElem.click();
}
e.preventDefault(); // prevent navigation to "#"
}, false);
fileElem.addEventListener("change", handleFiles, false);
// loadButton.addEventListener('click', async () => {
// // Destructure the one-element array.
// [fileHandle] = await window.showOpenFilePicker();
// // Do something with the file handle.
// console.log(fileHandle);
// const file = await fileHandle.getFile();
// //const contexts = file.
// base_image = new Image();
// //var demoImage = document.querySelector('img');
// //var file = document.querySelector('input[type=file]').files[0];
// var reader = new FileReader();
// reader.onload = function (event) {
// base_image.src = reader.result;
// }
// reader.readAsDataURL(file);
// //base_image.src = file.stream();
// base_image.onload = function(){
// ctx.drawImage(base_image, 0, 0);
// }
// });
}
function handleFiles() {
if (!this.files.length) {
fileList.innerHTML = "<p>No files selected!</p>";
} else {
fileList.innerHTML = "";
const list = document.createElement("ul");
fileList.appendChild(list);
for (let i = 0; i < this.files.length; i++) {
const li = document.createElement("li");
list.appendChild(li);
const img = document.createElement("img");
img.src = URL.createObjectURL(this.files[i]);
img.height = 60;
img.onload = function () {
URL.revokeObjectURL(this.src);
ctx.drawImage(img, 0, 0);
}
li.appendChild(img);
const info = document.createElement("span");
info.innerHTML = this.files[i].name + ": " + this.files[i].size + " bytes";
li.appendChild(info);
}
}
}