alert(document.getElementById('s3').getAttribute('d'));
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
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<body>
<svg viewBox="0 0 990 180" height="200" width="1100" id="mySVG">
<g>
<path id="s2" d="M 241,128 C 272,113 293,152 369,125 C 434,80 471,72 580,114 "
fill="none" stroke="red" stroke-width="5px" />
<path id="s3" d="M 241,128 C266,131 298,100 369,125 C 441,150 482,151 580,114 "
fill="none" stroke="blue" stroke-width="5px" />
</g>
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答案 0 :(得分:1)
我希望我能理解您的问题:如果要从一条曲线到另一条曲线制作动画,可以使用SMIL动画。
由于代码中的路径具有相同的编号和相同的命令类型,因此可以使用<animate>
元素为d属性设置动画。
values
属性是用分号(;)分隔的值的列表,第一个和最后一个值是曲线的d属性。第二个值是另一个的d属性。
在我的代码中,动画的持续时间为5秒:dur="5s
<svg viewBox="235 80 350 70" width="300" id="mySVG">
<g>
<path id="s2" d="M 241,128
C 272,113 293,152 369,125
C 434,80 471,72 580,114" fill="none" stroke="red" stroke-width="5px">
</path>
<path id="s3" d="M 241,128
C266,131 298,100 369,125
C 441,150 482,151 580,114" fill="none" stroke="blue" stroke-width="5px">
<animate attributeName="d" attributeType="XML" values="M 241,128
C266,131 298,100 369,125
C 441,150 482,151 580,114;
M 241,128
C 272,113 293,152 369,125
C 434,80 471,72 580,114;
M 241,128
C266,131 298,100 369,125
C 441,150 482,151 580,114; " dur="5s" repeatCount="indefinite" />
</path>
</g>
</svg>
OP正在评论:
我可以使用javascript吗?
使用javascript制作起来更加复杂。您将需要设置一个值数组和一个目标值数组,并在动画的每一帧中重新计算曲线的每个值。接下来是一个使点击时的蓝色曲线动画的示例:
请阅读代码中的注释。
//I've hard coded the values and the target array
//you may want to do it dimamicaly from the d attribute
let vals = [
["M", 241, 128],
["C", 272, 113, 293, 152, 369, 125],
["C", 434, 80, 471, 72, 580, 114]
];
let target = [
["M", 241, 128],
["C", 266, 131, 298, 100, 369, 125],
["C", 441, 150, 482, 151, 580, 114]
];
//the request animation id
let rid = null;
//build the memory array used for the animation
let memory = [];
for (let i = 0; i < vals.length; i++) {
memory[i] = [];
memory[i][0] = target[i].slice();
memory[i][1] = vals[i].slice();
}
function Frame() {
rid = window.requestAnimationFrame(Frame);
updateValues();
updatePath();
}
window.addEventListener("load", updatePath, false);
// I'm animating the curve on click
svg.addEventListener(
"mousedown",
function () {
// if there is an animation running stop it before start another one
if (rid) {
window.cancelAnimationFrame(rid);
rid = null;
}
//reverse the animation
for (let i = 0; i < memory.length; i++) {
memory[i].reverse();
target[i] = memory[i][1].slice();
}
//call the Frame function
Frame();
},
false
);
function updateValues() {
//a function to update all the values of the curve except the move to part that is not changing anyway
for (let i = 1; i < vals.length; i++) {
for (let j = 1; j < vals[i].length; j++) {
let dist = target[i][j] - vals[i][j];
let vel = dist / 10;
vals[i][j] += vel;
}
}
}
//a function to reset the value of the d attribute
function updatePath() {
let d = `M${vals[0][1]},${vals[0][2]}`;
for (let i = 1; i < vals.length; i++) {
d += `C${vals[i][1]},${vals[i][2]},${vals[i][3]},${vals[i][4]},${vals[i][5]},${vals[i][6]}`;
}
s3.setAttributeNS(null, "d", d);
}
svg{border:1px solid}
<svg id="svg" viewBox="235 80 350 70" width="300" id="mySVG">
<g>
<path id="s2" d="M 241,128
C 272,113 293,152 369,125
C 434,80 471,72 580,114" fill="none" stroke="red" stroke-width="5px">
</path>
<path id="s3" d="M 241,128
C266,131 298,100 369,125
C 441,150 482,151 580,114" fill="none" stroke="blue" stroke-width="5px">
</path>
</g>
</svg>