How to realize Wave effect Map by html5
This article mainly introduces html5 how to achieve wave effect map related knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that everyone after reading this html5 how to achieve wave effect map article will have a harvest, let's take a look at it.
First draw a simple circle to make a new shake straight microcircle.
Var ctx = document.getElementById ('myCanvas'). GetContext (' 2d')
Ctx.lineWidth = 1
Ctx.strokeStyle = "orange"
Ctx.arc (100, 100, 100, 90, 0, 10, 7, 2, 9, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 4, 2, 4, 2, 4, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
Ctx.stroke ()
Rolling up and down in the circle is the line that direct friends can read and move.
Var ctx = document.getElementById ('myCanvas'). GetContext (' 2d')
Var y = 100
Var flag = 0
Function init () {
/ / clear canvas
Ctx.clearRect (0Pol 0200200)
/ / calculate the corresponding x value as the y value moves up and down on the left semicircle
/ / var y = 30
Var expression = 8100-Math.pow ((100mury), 2)
Var x = 100-Math.sqrt (expression)
Ctx.beginPath ()
Ctx.lineWidth = 1
Ctx.strokeStyle = "orange"
Ctx.arc (100, 100, 100, 90, 0, 10, 7, 2, 9, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 4, 2, 4, 2, 4, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
Ctx.stroke ()
Ctx.lineWidth = 1
Ctx.strokeStyle = "green"
Ctx.beginPath ()
Ctx.moveTo (XBI y)
Ctx.lineTo (200murx, y)
Ctx.stroke ()
If (flag = = 0) {
Y + = 1
If (y = = 130) {
Flag = 1
}
} else {
Y-= 1
If (y = = 70) {
Flag = 0
}
}
Window.requestAnimationFrame (init)
}
In the whole process, the simulated water needs more ups and downs than the need to shake friends.
Var ctx = document.getElementById ('myCanvas'). GetContext (' 2d')
Var y = 100
Var flag = 0
Function init () {
/ / clear canvas
Ctx.clearRect (0Pol 0200200)
/ / calculate the corresponding x value as the y value moves up and down on the left semicircle
Var expression = 8100-Math.pow ((100mury), 2)
Var x = 100-Math.sqrt (expression)
Ctx.lineWidth = 1
Ctx.strokeStyle = "green"
Ctx.beginPath ()
Ctx.moveTo (XBI y)
Ctx.lineTo (200murx, y)
Ctx.stroke ()
/ / calculate the point at which the starting point of the circle (the right endpoint of the diameter parallel to the X axis) and the given Y coordinate on the left side of the circle
Var distance = Math.sqrt (Math.pow ((190murx), 2) + Math.pow ((100mury), 2))
/ / sina=d/2r an is half of the angle 2a is the center angle of two points Math.asin the final result is radians such as asin (1) = 1/2*PI
Var angle = Math.asin (distance/180) * 2
Ctx.beginPath ()
If (y)
