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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,229 @@ | ||
| <!DOCTYPE html> | ||
| <html lang="en"> | ||
|
|
||
| <head> | ||
| <meta charset="UTF-8"> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | ||
| <title>Document</title> | ||
| <script src='https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.7/dat.gui.min.js'></script> | ||
| <style> | ||
| html, | ||
| body, | ||
| #app { | ||
| margin: 0; | ||
| padding: 0; | ||
| width: 100%; | ||
| height: 100%; | ||
| } | ||
| </style> | ||
| </head> | ||
|
|
||
| <body> | ||
| <div id="app"> | ||
| <canvas id="canvas"></canvas> | ||
| </div> | ||
| <script> | ||
| let ball = null | ||
| const canvas = document.getElementById('canvas') | ||
| const ww = canvas.width = window.innerWidth | ||
| const hh = canvas.height = window.innerHeight | ||
| const content = canvas.getContext('2d') | ||
|
|
||
| window.addEventListener("resize", function () { | ||
| const ww = canvas.width = window.innerWidth | ||
| const hh = canvas.height = window.innerHeight | ||
| }) | ||
|
|
||
| const controlparams = { | ||
| vx: 0, | ||
| vy: 0, | ||
| ax: 0, | ||
| ay: 0.6, | ||
| velocityLine: false, | ||
| fade: 0.99, | ||
| color: '#fff', | ||
| update: true, | ||
| step: function () { | ||
| ball.update() | ||
| }, | ||
| FPS: 120, | ||
| } | ||
| const gui = new dat.GUI() | ||
| gui.add(controlparams, "vx", -50, 50).listen().onChange(function (value) { | ||
| ball.v.x = value | ||
| }) | ||
| gui.add(controlparams, "vy", -50, 50).listen().onChange(function (value) { | ||
| ball.v.y = value | ||
| }) | ||
| gui.add(controlparams, "ax", -1, 1).listen().onChange(function (value) { | ||
| ball.a.x = value | ||
| }) | ||
| gui.add(controlparams, "ay", -1, 1).step(0.001).listen().onChange(function (value) { | ||
| ball.a.y = value | ||
| }) | ||
| gui.add(controlparams, "velocityLine").listen() | ||
| gui.add(controlparams, "fade", 0, 1).step(0.001).listen() | ||
| gui.add(controlparams, "update") | ||
| gui.addColor(controlparams, "color") | ||
| gui.add(controlparams, "step") | ||
| gui.add(controlparams, "FPS", 1, 120) | ||
|
|
||
| const Ball = function () { | ||
| this.p = { | ||
| x: ww / 2, y: hh / 2 | ||
| } | ||
| this.v = { | ||
| x: 10, y: 0 | ||
| } | ||
| this.a = { | ||
| x: 0, y: 1 | ||
| } | ||
| this.r = 50 | ||
| this.dragging = false | ||
| } | ||
| Ball.prototype.draw = function () { | ||
| content.save() | ||
| content.translate(this.p.x, this.p.y) | ||
| content.beginPath() | ||
| content.fillStyle = controlparams.color | ||
| content.arc(0, 0, this.r, 0, Math.PI * 2) | ||
| content.fill() | ||
| content.restore() | ||
| if (controlparams.velocityLine) { | ||
| content.save() | ||
| content.translate(this.p.x, this.p.y) | ||
| content.scale(3, 3) | ||
| content.beginPath() | ||
| content.strokeStyle = "red" | ||
| content.moveTo(0, 0) | ||
| content.lineTo(this.v.x, this.v.y) | ||
| content.stroke() | ||
| content.restore() | ||
|
|
||
| content.save() | ||
| content.translate(this.p.x, this.p.y) | ||
| content.scale(3, 3) | ||
| content.beginPath() | ||
| content.strokeStyle = "blue" | ||
| content.moveTo(0, 0) | ||
| content.lineTo(this.v.x, 0) | ||
| content.stroke() | ||
| content.restore() | ||
|
|
||
| content.save() | ||
| content.translate(this.p.x, this.p.y) | ||
| content.scale(3, 3) | ||
| content.beginPath() | ||
| content.strokeStyle = "green" | ||
| content.moveTo(0, 0) | ||
| content.lineTo(0, this.v.y) | ||
| content.stroke() | ||
| content.restore() | ||
| } | ||
| } | ||
| Ball.prototype.update = function () { | ||
| if (ball.dragging === false) { | ||
| this.p.x += this.v.x | ||
| this.p.y += this.v.y | ||
| this.v.x += this.a.x | ||
| this.v.y += this.a.y | ||
|
|
||
| this.v.x = controlparams.fade * this.v.x | ||
| this.v.y = controlparams.fade * this.v.y | ||
| // here update new controls params | ||
| controlparams.vx = this.v.x | ||
| controlparams.vy = this.v.y | ||
| controlparams.ax = this.a.x | ||
| controlparams.ay = this.a.y | ||
| } | ||
| } | ||
| Ball.prototype.checkboundary = function () { | ||
| if ((this.p.x + this.r) >= ww) { | ||
| this.v.x = -Math.abs(this.v.x) | ||
| } | ||
| if ((this.p.y + this.r) >= hh) { | ||
| this.v.y = -Math.abs(this.v.y) | ||
| } | ||
| if ((this.p.x - this.r) <= 0) { | ||
| this.v.x = Math.abs(this.v.x) | ||
| } | ||
| if ((this.p.y - this.r) <= 0) { | ||
| this.v.y = Math.abs(this.v.y) | ||
| } | ||
| } | ||
| function draw() { | ||
| content.fillStyle = "rgba(0,0,0,0.5)" | ||
| content.fillRect(0, 0, ww, hh) | ||
| ball.draw() | ||
| setTimeout(draw, 1000 / controlparams.FPS); | ||
| } | ||
| requestAnimationFrame(draw) | ||
| function update() { | ||
| if (controlparams.update) { | ||
| ball.update() | ||
| } | ||
| ball.checkboundary() | ||
| } | ||
|
|
||
| setInterval(update, 1000 / 60) | ||
| function init() { | ||
| ball = new Ball() | ||
| } | ||
| init() | ||
| // okay next then we try to use mouse dragging | ||
| // herre build distance | ||
| function getdistance(p1, p2) { | ||
| const dx = p1.x - p2.x | ||
| const dy = p1.y - p2.y | ||
| const dPow = Math.pow(dx, 2) + Math.pow(dy, 2) | ||
| return Math.sqrt(dPow) | ||
| } | ||
|
|
||
| let mouse = { | ||
| x: 0, | ||
| y: 0 | ||
| } | ||
| // herer to add mouse event | ||
| canvas.addEventListener('mousedown', function (e) { | ||
| mouse = { | ||
| x: e.x, | ||
| y: e.y | ||
| } | ||
| const dist = getdistance(mouse, ball.p) | ||
| if (dist < ball.r) { | ||
| ball.dragging = true | ||
| } | ||
| }) | ||
|
|
||
| canvas.addEventListener('mousemove', function (e) { | ||
| // okay here to add position to ball | ||
| const currentPos = { | ||
| x: e.x, y: e.y | ||
| } | ||
| if (ball.dragging) { | ||
| const dx = currentPos.x - mouse.x | ||
| const dy = currentPos.y - mouse.y | ||
| ball.p.x += dx | ||
| ball.p.y += dy | ||
| ball.v.x = dx | ||
| ball.v.y = dy | ||
| } | ||
| const dist = getdistance(currentPos, ball.p) | ||
|
|
||
| if (dist < ball.r) { | ||
| canvas.style.cursor = "move" | ||
| } else { | ||
| ball.dragging = false | ||
| canvas.style.cursor = "initial" | ||
| } | ||
| }) | ||
|
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||
| canvas.addEventListener('mouseup', function () { | ||
| ball.dragging = false | ||
| }) | ||
|
|
||
|
|
||
| </script> | ||
| </body> | ||
|
|
||
| </html> |