Heim >Web-Frontend >js-Tutorial >Wie implementiert man Tangram-Muster und Partikeluhr-Effekt auf Leinwand? (Codebeispiel)
Wie implementiert man Tangram-Muster und Partikeluhr-Effekt auf Leinwand? Der folgende Artikel stellt es Ihnen vor. Es hat einen gewissen Referenzwert. Freunde in Not können sich darauf beziehen. Ich hoffe, es wird für alle hilfreich sein.
Leinwand implementiert Puzzle
<canvas id="canvas" width="800" height="800"></canvas>
<script>
var rangram = [
{ p: [{ x: 0, y: 0 }, { x: 800, y: 0 }, { x: 400, y: 400 }], color: "#caff67" },
{ p: [{ x: 0, y: 0 }, { x: 400, y: 400 }, { x: 0, y: 800 }], color: "#67becf" },
{ p: [{ x: 800, y: 0 }, { x: 800, y: 400 }, { x: 600, y: 600 }, { x: 600, y: 200 }], color: "#ef3d61" },
{ p: [{ x: 600, y: 200 }, { x: 600, y: 600 }, { x: 400, y: 400 }], color: "#f9f51a" },
{ p: [{ x: 400, y: 400 }, { x: 600, y: 600 }, { x: 400, y: 800 }, { x: 200, y: 600 }], color: "#a594c0" },
{ p: [{ x: 200, y: 600 }, { x: 400, y: 800 }, { x: 0, y: 800 }], color: "#fa8ecc" },
{ p: [{ x: 800, y: 400 }, { x: 800, y: 800 }, { x: 400, y: 800 }], color: "#f6ca29" },
]
var canvas = document.getElementById('canvas');
if (canvas.getContext) {
var context = canvas.getContext("2d");
for(var i = 0; i < rangram.length; i++){
draw(rangram[i],context);
}
}
function draw(seat,context){
context.beginPath();
var pointArr = seat.p;
context.moveTo(pointArr[0].x, pointArr[0].y);
for(var i = 1; i < pointArr.length; i++){
context.lineTo(pointArr[i].x, pointArr[i].y);
}
context.closePath();
context.fillStyle=seat.color;
context.fill();
context.lineWidth=3;
context.stroke();
context.shadowColor='#ddd';
context.shadowBlur=30;
}
Leinwand implementiert Partikeluhr
<canvas id="canvas"></canvas>
<script src="./digit.js"></script>
<script>
var SCREEN_WIDTH = document.body.clientWidth;
var SCREEN_HEIGHT = document.body.clientHeight;
var currentTime = null;
var MARGIN_LEFT = Math.round(SCREEN_WIDTH / 10);
var MARGIN_TOP = Math.round(SCREEN_HEIGHT / 10);
var RADIUS = Math.round(SCREEN_WIDTH * 4 / 5 / 108) - 1;
var timerArr = [];
var balls = [];
const colors = ["#33B5E5", "#0099CC", "#AA66CC", "#9933CC", "#99CC00", "#669900", "#FFBB33", "#FF8800", "#FF4444", "#CC0000"]
window.onload = function () {
var canvas = document.getElementById('canvas');
var context = canvas.getContext("2d");
canvas.width = SCREEN_WIDTH;
canvas.height = SCREEN_HEIGHT;
if (canvas.getContext) {
var context = canvas.getContext('2d');
setInterval(function () {
upData();
rander(context);
}, 50);
}
}
function upData() {
currentTime = new Date();
var curHours = currentTime.getHours();
var curMinutes = currentTime.getMinutes();
var curSeconds = currentTime.getSeconds();
var HoursOne = parseInt(curHours / 10);
var HoursTwo = parseInt(curHours % 10);
var MinutesOne = parseInt(curMinutes / 10);
var MinutesTwo = parseInt(curMinutes % 10);
var SecondsOne = parseInt(curSeconds / 10);
var SecondsTwo = parseInt(curSeconds % 10);
if (HoursOne != timerArr[0]) {
addBalls(MARGIN_LEFT + 0, MARGIN_TOP, HoursOne);
}
if (HoursTwo != timerArr[1]) {
addBalls(MARGIN_LEFT + 15 * (RADIUS + 1), MARGIN_TOP, HoursTwo);
}
if (MinutesOne != timerArr[2]) {
addBalls(MARGIN_LEFT + 39 * (RADIUS + 1), MARGIN_TOP, MinutesOne);
}
if (MinutesTwo != timerArr[3]) {
addBalls(MARGIN_LEFT + 54 * (RADIUS + 1), MARGIN_TOP, MinutesTwo);
}
if (SecondsOne != timerArr[4]) {
addBalls(MARGIN_LEFT + 78 * (RADIUS + 1), MARGIN_TOP, SecondsOne);
}
if (SecondsTwo != timerArr[5]) {
addBalls(MARGIN_LEFT + 93 * (RADIUS + 1), MARGIN_TOP, SecondsTwo);
}
timerArr = [HoursOne, HoursTwo, MinutesOne, MinutesTwo, SecondsOne, SecondsTwo];
updataBall();
}
function updataBall() {
for (var i = 0; i < balls.length; i++) {
balls[i].x = balls[i].x + balls[i].vx;
balls[i].vy = balls[i].vy + balls[i].g;
balls[i].y = balls[i].y + balls[i].vy;
if (balls[i].y + RADIUS > SCREEN_HEIGHT) {
balls[i].y = SCREEN_HEIGHT - RADIUS;
balls[i].vy = - balls[i].vy * 0.8;
}
}
var t = 0;
for (var i = 0; i < balls.length; i++) {
if (balls[i].x + RADIUS > 0 && balls[i].x - RADIUS < SCREEN_WIDTH) {
balls[t++] = balls[i];
}
}
while(balls.length > t){
balls.pop();
}
}
function addBalls(x, y, number) {
for (var i = 0; i < digit[number].length; i++)
for (var j = 0; j < digit[number][i].length; j++)
if (digit[number][i][j] == 1) {
var obj = {
x: x + j * 2 * (RADIUS + 1) + (RADIUS + 1),
y: y + i * 2 * (RADIUS + 1) + (RADIUS + 1),
g: 1.5 + Math.random(),
vx: Math.pow(-1, Math.ceil(Math.random() * 100)) * 4,
vy: -5,
color: colors[Math.floor(Math.random() * colors.length)]
}
balls.push(obj);
}
}
function rander(context) {
context.clearRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
var hours = currentTime.getHours();
var minutes = currentTime.getMinutes();
var seconds = currentTime.getSeconds();
renderDigit(MARGIN_LEFT, MARGIN_TOP, parseInt(hours / 10), context)
renderDigit(MARGIN_LEFT + 15 * (RADIUS + 1), MARGIN_TOP, parseInt(hours % 10), context)
renderDigit(MARGIN_LEFT + 30 * (RADIUS + 1), MARGIN_TOP, 10, context)
renderDigit(MARGIN_LEFT + 39 * (RADIUS + 1), MARGIN_TOP, parseInt(minutes / 10), context);
renderDigit(MARGIN_LEFT + 54 * (RADIUS + 1), MARGIN_TOP, parseInt(minutes % 10), context);
renderDigit(MARGIN_LEFT + 69 * (RADIUS + 1), MARGIN_TOP, 10, context);
renderDigit(MARGIN_LEFT + 78 * (RADIUS + 1), MARGIN_TOP, parseInt(seconds / 10), context);
renderDigit(MARGIN_LEFT + 93 * (RADIUS + 1), MARGIN_TOP, parseInt(seconds % 10), context);
randerBall(context);
}
function randerBall(context) {
for (var i = 0; i < balls.length; i++) {
context.fillStyle = balls[i].color;
context.beginPath();
context.arc(balls[i].x, balls[i].y, RADIUS, 0, Math.PI * 2, 0);
context.closePath();
context.fill();
}
}
function renderDigit(x, y, number, context) {
context.fillStyle = 'rgb(0,102,153)';
for (var i = 0; i < digit[number].length; i++)
for (var j = 0; j < digit[number][i].length; j++)
if (digit[number][i][j] == 1) {
context.beginPath();
context.arc(x + j * 2 * (RADIUS + 1) + (RADIUS + 1), y + i * 2 * (RADIUS + 1) + (RADIUS + 1), RADIUS, 0, 2 * Math.PI)
context.closePath();
context.fill()
}
}
</script>
digit = [ [ [0,0,1,1,1,0,0], [0,1,1,0,1,1,0], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [0,1,1,0,1,1,0], [0,0,1,1,1,0,0] ],//0 [ [0,0,0,1,1,0,0], [0,1,1,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [1,1,1,1,1,1,1] ],//1 ......
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