控制补间动画

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我们可以使用play(), pause(), reverse(), reset(), finish(), seek()等方法,来控制补间动画。

下面的示例将演示各个控制器的效果。

All Tween Controlsview raw
<!DOCTYPE html>
<html>
<head>
<script src="https://unpkg.com/konva@4.0.18/konva.min.js"></script>
<meta charset="utf-8" />
<title>Konva All Controls Demo</title>
<style>
body {
margin: 0;
padding: 0;
overflow: hidden;
background-color: #f0f0f0;
}
#buttons {
position: absolute;
top: 5px;
left: 10px;
}
#buttons > input {
padding: 10px;
display: inline-block;
margin-right: 5px;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="buttons">
<input type="button" id="play" value="Play" />
<input type="button" id="pause" value="Pause" />
<input type="button" id="reverse" value="Reverse" />
<input type="button" id="reset" value="Reset" />
<input type="button" id="seek" value="Seek 3" />
<input type="button" id="finish" value="Finish" />
</div>
<script>
var width = window.innerWidth;
var height = window.innerHeight;

var stage = new Konva.Stage({
container: 'container',
width: width,
height: height
});

var layer = new Konva.Layer();

var rect = new Konva.Rect({
x: 50,
y: 130,
width: 100,
height: 50,
fill: 'green',
stroke: 'black',
strokeWidth: 2,
opacity: 0.2
});

layer.add(rect);
stage.add(layer);

// the tween has to be created after the node has been added to the layer
var tween = new Konva.Tween({
node: rect,
duration: 6,
x: 220,
y: 75,
rotation: Math.PI * 10,
opacity: 1,
strokeWidth: 6,
scaleX: 1.3,
scaleY: 1.3,
easing: Konva.Easings.Linear,
fillR: 0,
fillG: 0,
fillB: 255
});

// pause tween
document.getElementById('pause').addEventListener(
'click',
function() {
tween.pause();
},
false
);

// reverse tween
document.getElementById('reverse').addEventListener(
'click',
function() {
tween.reverse();
},
false
);

// play tween forward
document.getElementById('play').addEventListener(
'click',
function() {
tween.play();
},
false
);

// reset tween
document.getElementById('reset').addEventListener(
'click',
function() {
tween.reset();
},
false
);

// force tween to finish
document.getElementById('finish').addEventListener(
'click',
function() {
tween.finish();
},
false
);

// seek to 3 seconds
document.getElementById('seek').addEventListener(
'click',
function() {
tween.seek(3);
},
false
);
</script>
</body>
</html>