Canvas波形運動

class

ball
draw
(ctx)
}

lang

="en"
>
>
charset
="utf-8"
>
>
documenttitle
>
>
*#canvas
style
>
head
>
>
"canvas"
width
="800"
height
="500"
>
canvas
>
src=
"ball.js"
>
script
>
>
let canvas = document.
getelementbyid
('canvas');
let ctx = canvas.
getcontext
('2d');
letw
= canvas.width;
leth
= canvas.height;
let ball =
newball()
.draw
(ctx)
;let angle =0;
const
swing
=160
;//(振幅)因為sin的取值範圍在[-1,1],移動範圍就很小, 就乘上乙個固定值,這樣每次移動的範圍就大一些
(function
move()
)()script
>
body
>
html
>

let canvas = document.

getelementbyid
('canvas');
let ctx = canvas.
getcontext
('2d');
letw
= canvas.width;
leth
= canvas.height;
let ball =
newball()
.draw
(ctx)
;let angle =0;
let vx =2;
const
swing
=100
;//(振幅)因為sin的取值範圍在[-1,1],移動範圍就很小, 就乘上乙個固定值,這樣每次移動的範圍就大一些
(function
move()
)()

let canvas = document.

getelementbyid
('canvas');
let ctx = canvas.
getcontext
('2d');
letw
= canvas.width;
leth
= canvas.height;
let ball =
newball()
.draw
(ctx)
;let angle =0;
let initscale =1;
const
swing
=0.5
;//(振幅)因為sin的取值範圍在[-1,1],移動範圍就很小, 就乘上乙個固定值,這樣每次移動的範圍就大一些
(function
move()
)();

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