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tema-curs3.html
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tema-curs3.html
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<html>
<body>
<script>
getRandom = (min, max) => {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
//////////////////////////////////////////////////////ex1;
const ex1 = () => {
const canvas = document.createElement("canvas");
canvas.setAttribute("id", "canvas");
canvas.style.border = "1px solid red";
document.body.appendChild(canvas);
canvas.setAttribute("width", 300);
canvas.setAttribute("height", 300);
let _2d = canvas.getContext("2d");
//exe1
_2d.beginPath();
_2d.arc(50, 50, 30, 0, 2 * Math.PI);
_2d.fillStyle = "blue";
_2d.fill();
_2d.fillStyle = "white";
_2d.font = "10px Arial";
_2d.closePath();
_2d.fillText("Ex1", 40, 50);
class Rectangle {
constructor(context, size) {
this.context = context;
this.l1 = size.l1;
this.l2 = size.l2;
}
draw(config) {
const rotate = config.rotate;
const fill = config.fill;
const translate = config.translate;
const stroke = config.stroke;
if (translate) {
const tX = config.translate.x;
const tY = config.translate.y;
this.context.translate(tX, tY);
}
if (rotate) {
this.context.rotate(rotate);
}
if (fill) {
this.context.beginPath();
this.context.fillStyle = f;
this.context.fillRect(0, 0, this.l1, this.l2);
this.context.closePath();
} else
if (stroke) {
this.context.rect(0, 0, this.l1, this.l2);
this.context.strokeStyle = config.stroke;
this.context.stroke();
}
}
}
const rectSize = { l1: 200, l2: 400 };
const rectConfig = {
fill: "#235554",
translate: { y: canvas.height * 0.01, x: canvas.width * 0.01 },
rotate: - 15 * Math.PI / 180
};
}
ex1();
//////////////////////////////////////////////////////ex2;
const ex2 = () => {
const canvas = document.createElement("canvas");
canvas.setAttribute("id", "canvas");
canvas.style.border = "1px solid red";
document.body.appendChild(canvas);
canvas.setAttribute("width", 300);
canvas.setAttribute("height", 300);
let _2d = canvas.getContext("2d");
class CanvasSquare {
constructor(face) {
this.pozX = 0;
this.pozY = 0;
this.rotation = 0;
this.face = face;
}
position(poz) {
if (typeof poz.y == "number") {
this.pozY = (poz.y > 0) ? (poz.y) : 0;
}
if (typeof poz.x == "number") {
this.pozX = (poz.x > 0) ? (poz.x) : 0;
}
}
draw(context) {
context.moveTo(this.pozX, this.pozY);
context.beginPath();
context.lineTo(this.pozX + this.face, this.pozY);
context.lineTo(this.pozX + this.face, this.pozY + this.face);
context.lineTo(this.pozX, this.pozY + this.face);
context.lineTo(this.pozX, this.pozY);
context.font = "12px Arial";
const txtX = this.pozX + this.face / 2 - 10;
const txtY = this.pozY + this.face / 3 + 12;
context.fillText("Ex2", txtX, txtY)
context.closePath();
context.stroke();
}
}
const drawSquare = () => {
const s = new CanvasSquare(40);
s.position({ x: canvas.width / 10, y: canvas.height / 10 });
s.draw(_2d);
}
drawSquare();
}
ex2();
//////////////////////////////////////////////////////ex3;
class MovingCircle {
constructor(start, radius) {
this.x = start.x;
this.y = start.y;
this.r = radius;
this.dx = 1;
this.dy = 1;
this.dr = 1;
this.bounceColor();
}
draw(context) {
if (this.r == 0) {
this.bounceR();
//this.nextR();
}
context.beginPath();
context.fillStyle = this.color;
context.arc(this.x, this.y, this.r, 0, 2 * Math.PI);
context.fill();
context.closePath();
}
bounceX() {
this.dx *= -1;
}
bounceY() {
this.dy *= -1;
}
bounceR() {
this.dr *= -1;
}
bounceColor() {
const r = getRandom(0, 255);
const g = getRandom(0, 255);
const b = getRandom(0, 255);
this.color = `rgb(${r},${g},${b})`;
}
nextMovementX(stepX) {
const next = this.x + stepX * this.dx;
return next;
}
nextMovementY(stepY) {
const next = this.y + stepY * this.dy;
return next;
}
nextR() {
this.r += this.dr;
}
move(context, bounds, step) {
if (this.nextMovementX(step.x) + this.r > bounds.x) {
this.x = bounds.x - this.r;
this.bounceX();
this.bounceColor();
this.bounceR();
} else
if (this.nextMovementX(step.x) - this.r < 0) {
this.x = this.r;
this.bounceX();
this.bounceColor();
this.bounceR();
} else {
this.x = this.nextMovementX(step.x);
}
if (this.nextMovementY(step.y) + this.r > bounds.y) {
this.y = bounds.y - this.r;
this.bounceY();
this.bounceColor();
this.bounceR();
} else
if (this.nextMovementY(step.y) - this.r < 0) {
this.y = this.r;
this.bounceY();
this.bounceColor();
this.bounceR();
} else {
this.y = this.nextMovementY(step.y);
}
this.draw(context);
this.nextR();
}
}
const ex3 = () => {
const canvas = document.createElement("canvas");
canvas.setAttribute("id", "canvas");
canvas.style.border = "1px solid red";
document.body.appendChild(canvas);
canvas.setAttribute("width", 300);
canvas.setAttribute("height", 300);
let _2d = canvas.getContext("2d");
const circle = new MovingCircle({ x: 173, y: 143 }, 20);
setInterval(() => {
const _2d = canvas.getContext("2d");
const movingBounds = { x: canvas.width, y: canvas.height };
const step = { x: 7, y: 5 };
_2d.clearRect(0, 0, canvas.width, canvas.height);
_2d.beginPath();
_2d.font = `${15}px Arial`;
_2d.fillStyle = "black";
_2d.fillText("Ex3", 15, 15);
_2d.closePath();
_2d.fill();
circle.move(_2d, movingBounds, step);
}, 500 /*100*/);
}
ex3();
//////////////////////////////////////////////////////ex4;
const ex4 = () => {
const canvas = document.createElement("canvas");
canvas.setAttribute("id", "canvas");
canvas.style.border = "1px solid red";
document.body.appendChild(canvas);
canvas.setAttribute("width", 300);
canvas.setAttribute("height", 300);
let _2d = canvas.getContext("2d");
_2d.beginPath();
_2d.font = `${15}px Arial`;
_2d.fillStyle = "black";
_2d.fillText("Ex3", 15, 15);
_2d.closePath();
_2d.fill();
const gridSize = { rows: 20, cols: 30 };
const cellSize = { w: 30, h: 30 };
const canvasSize = {
w: gridSize.rows * cellSize.w,
h: gridSize.cols * cellSize.h
};
canvas.width = canvasSize.h;
canvas.height = canvasSize.w;
_2d = canvas.getContext("2d");
class Cell {
constructor(x, y, color) {
this.x = x;
this.y = y;
this.color = color;
}
draw(context) {
const beginX=this.y * cellSize.h,
beginY=this.x * cellSize.w,
lengthX= cellSize.w,
lengthY=cellSize.h;
context.beginPath();
context.fillStyle = this.color;
context.rect(beginX, beginY, lengthX, lengthY);
context.fill();
context.stroke();
context.closePath();
}
}
const grid = [];
const createGrid = () => {
for (let r = 0; r < gridSize.rows; r++) {
grid[r] = [];
for (let c = 0; c < gridSize.cols; c++) {
const color = (r % 2 ^ c % 2) ? "black" : "white";
grid[r][c] = new Cell(r, c, color);//apply xor
}
}
}
createGrid();
const drawGrid = () => {
for (let r = 0; r < gridSize.rows; r++) {
for (let c = 0; c < gridSize.cols; c++) {
grid[r][c].draw(_2d);
}
}
}
drawGrid();
class Square {
constructor(row, column, length) {
this.row = row;
this.column = column;
this.length = length;
}
draw(grid, context) {
let c = this.column;
let r = this.row;
context.beginPath();
context.fillStyle = "blue";
const cell = grid[c][r];
const beginX=cell.x * cellSize.w,
beginY=cell.y * cellSize.h,
lengthX= cellSize.w * this.length,
lengthY= cellSize.h * this.length;
context.rect(beginX, beginY,lengthX,lengthY);
context.fill();
context.closePath();
}
}
new Square(2, 3, 2).draw(grid, _2d);
}
ex4();
</script>
</body>
</html>