SVG中有一个直接的往返，但是我不确定如何使用
它正确。另外，我发现关键时间在某些情况下很有用，但是
没有产生预期的结果。
可以从路径的任何位置开始不使用JS来开始SVG动画，但是必须在代码中预先确定其位置。
为此使用了一对属性。
keyPoints="0;1" - movement from start to finish
keyTimes="0;1"
keyPoints="0.5;1" - movement from the middle of the way to the end
keyTimes="0;1"
keyPoints="1;0" - movement from end to start
keyTimes="0;1"
这样，您可以控制动画起点的位置，但是从理论上讲不可能从随机选择的点创建动画，因为SVG中没有变量，没有数组，也没有用于存储和执行的指令数学函数。
在下面的示例中，JS仅用于处理按下控制按钮的事件：
<div id="pathContainer4">
<button id="btn1" onclick="forwardSVG()">forward</button />
<button id="btn2" onclick="middleSVG()">Middle</button />
<button id="btn3" onclick="backSVG()">Back</button />
</div>
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" height="160" width="360" >
<g fill="none" stroke="black" stroke-width="1">
<path stroke-dasharray="3" id="motionpath2"
d="M 10 80 C 40 10,65 10,95 80 S 150 150,180 80" />
</g>
<circle class="circle2" r=8 fill=red>
<animateMotion
id="forward"
dur="2s"
begin="indefinite"
repeatCount="1"
keyPoints="0;1"
keyTimes="0;1"
calcMode="linear" >
<mpath href="#motionpath2" />
</animateMotion>
<animateMotion
id="middle"
dur="2s"
begin="indefinite"
repeatCount="1"
keyPoints="0.5;1"
keyTimes="0;1"
calcMode="linear" >
<mpath href="#motionpath2" />
</animateMotion>
<animateMotion
id="back"
dur="2s"
begin="indefinite"
repeatCount="1"
keyPoints="1;0"
keyTimes="0;1"
calcMode="linear" >
<mpath href="#motionpath2" />
</animateMotion>
</circle>
</svg>
<script>
var animation1 = document.getElementById("forward")
function forwardSVG(){
animation1.beginElement();
}
var animation2 = document.getElementById("middle")
function middleSVG(){
animation2.beginElement();
}
var animation3 = document.getElementById("back")
function backSVG(){
animation3.beginElement();
}
</script>
以下是一些没有JS的混乱字母运动错觉的例子
<style>
#text1 {
fill:#B2000C;
}
</style>
<svg width="50%" height="50%" viewBox="0 0 1000 1000"
xmlns="http://www.w3.org/2000/svg" version="1.1" baseProfile="tiny"
xmlns:xlink="http://www.w3.org/1999/xlink" preserveAspectRatio="xMinYMin meet">
<title>Animation of text x and y attributes</title>
<defs>
<linearGradient id="grad"
x1="0" y1="0" x2="0" y2="100%"
gradientUnits="userSpaceOnUse">
<stop offset="2%" stop-color="steelblue" />
<stop offset="45%" stop-color="hsla(180,100%,50%,0)" />
<stop offset="45%" stop-color="hsla(80,0)" />
<stop offset="95%" stop-color="yellowgreen" />
</linearGradient>
</defs>
<rect width="100%" height="100%" fill="url(#grad)" />
<text x="200 " y="500"
font-size="90" fill="#E4E4E4" stroke-width="4" stroke="#E4E4E4">Stackoverflow</text>
<text id="text1" x="200" y="500"
font-size="90">Stackoverflow</text>
<animate xlink:href="#text1"
attributeName="x"
attributeType="XML"
values="200 233 266 299 332 365 400 431 464 497 530 563 596;
100 600 200 365 700 465 465 563 530 398 431 850 900;
200 500 900 950 150 531 300 620 150 266 365 650 900;
332 233 820 300 800 633 200 670 300 850 800 530 266;
464 900 900 900 820 670 430 900 530 600 233 365 100;
332 100 100 100 500 100 800 563 900 700 900 100 100;
200 233 266 299 332 365 400 431 464 497 530 563 596"
dur="4s"
begin="0s"
repeatCount="2" />
<animate xlink:href="#text1"
attributeName="y"
attributeType="XML"
values="500 500 500 500 500 500 500 500 500 500 500 500 500;
100 200 850 100 250 175 750 100 750 720 850 500 50;
100 600 600 250 200 450 50 200 520 550 300 300 750;
500 100 650 650 600 150 550 50 150 550 200 550 400;
800 300 100 750 150 650 75 350 550 700 755 120 800;
800 600 300 150 750 350 700 650 200 250 500 650 100;
500 500 500 500 500 500 500 500 500 500 500 500 500"
dur="4s"
begin="0s"
repeatCount="2" />
</svg>
垂直停车信
<style>
#text1 {
fill:#B2000C;
}
</style>
<svg width="70%" height="70%" viewBox="0 0 1000 1000"
xmlns="http://www.w3.org/2000/svg" version="1.1" baseProfile="tiny"
xmlns:xlink="http://www.w3.org/1999/xlink" preserveAspectRatio="xMinYMin meet">
<title>Animation of text x and y attributes</title>
<defs>
<linearGradient id="grad"
x1="0" y1="0" x2="0" y2="100%"
gradientUnits="userSpaceOnUse">
<stop offset="2%" stop-color="steelblue" />
<stop offset="45%" stop-color="hsla(180,0)" />
<stop offset="95%" stop-color="yellowgreen" />
</linearGradient>
</defs>
<rect width="100%" height="100%" fill="url(#grad)" />
<text x="200 " y="500"
font-size="90" fill="#E4E4E4" stroke-width="4" stroke="#E4E4E4">Stackoverflow</text>
<text id="text1" x="200" y="500"
font-size="90">Stackoverflow</text>
<animate xlink:href="#text1"
attributeName="x"
attributeType="XML"
values="200 233 266 299 332 365 400 431 464 497 530 563 596;
100 600 200 365 700 465 465 563 530 398 431 850 900;
200 500 900 950 150 531 300 620 150 266 365 650 900;
332 233 820 300 800 633 200 670 300 850 800 530 266;
464 900 900 900 820 670 430 900 530 600 233 365 100;
332 100 100 100 500 100 800 563 900 700 900 100 100;
200 233 266 299 332 365 400 431 464 497 530 563 596"
dur="3s"
begin="0s"
repeatCount="2" />
<animate xlink:href="#text1"
attributeName="y"
attributeType="XML"
values="500 500 500 500 500 500 500 500 500 500 500 500 500;
100 200 850 100 250 175 750 100 750 720 850 500 50;
100 600 600 250 200 450 50 200 520 550 300 300 750;
500 100 650 650 600 150 550 50 150 550 200 550 400;
800 300 100 750 150 650 75 350 550 700 755 120 800;
800 600 300 150 750 350 700 650 200 250 500 650 100;
500 500 500 500 500 500 500 500 500 500 500 500 500"
dur="4s"
begin="0s"
repeatCount="2" />
</svg>
水平停车信
<style>
#text1 {
fill:#B2000C;
}
</style>
<svg width="50%" height="50%" viewBox="0 0 1000 1000"
xmlns="http://www.w3.org/2000/svg" version="1.1" baseProfile="tiny"
xmlns:xlink="http://www.w3.org/1999/xlink" preserveAspectRatio="xMinYMin meet">
<title>Animation of text x and y attributes</title>
<defs>
<linearGradient id="grad"
x1="0" y1="0" x2="0" y2="100%"
gradientUnits="userSpaceOnUse">
<stop offset="2%" stop-color="steelblue" />
<stop offset="45%" stop-color="hsla(180,0)" />
<stop offset="95%" stop-color="yellowgreen" />
</linearGradient>
</defs>
<rect width="100%" height="100%" fill="url(#grad)" />
<text x="200 " y="500"
font-size="90" fill="#E4E4E4" stroke-width="4" stroke="#E4E4E4">Stackoverflow</text>
<text id="text1" x="200" y="500"
font-size="90">Stackoverflow</text>
<animate xlink:href="#text1"
attributeName="x"
attributeType="XML"
values="200 233 266 299 332 365 400 431 464 497 530 563 596;
100 600 200 365 700 465 465 563 530 398 431 850 900;
200 500 900 950 150 531 300 620 150 266 365 650 900;
332 233 820 300 800 633 200 670 300 850 800 530 266;
464 900 900 900 820 670 430 900 530 600 233 365 100;
332 100 100 100 500 100 800 563 900 700 900 100 100;
200 233 266 299 332 365 400 431 464 497 530 563 596"
dur="4s"
begin="0s"
repeatCount="2" />
<animate xlink:href="#text1"
attributeName="y"
attributeType="XML"
values="500 500 500 500 500 500 500 500 500 500 500 500 500;
100 200 850 100 250 175 750 100 750 720 850 500 50;
100 600 600 250 200 450 50 200 520 550 300 300 750;
500 100 650 650 600 150 550 50 150 550 200 550 400;
800 300 100 750 150 650 75 350 550 700 755 120 800;
800 600 300 150 750 350 700 650 200 250 500 650 100;
500 500 500 500 500 500 500 500 500 500 500 500 500"
dur="3s"
begin="0s"
repeatCount="2" />
</svg>
台球随机运动错觉的另一个例子
<svg version="1.1" xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" height="100vh" viewBox="0 0 400 400">
<rect width="100%" height="100%" rx="25" fill="green" stroke="#9D8500" stroke-width="15"/>
<circle cx="50%" cy="20%" r="3%" fill="url(#gradB)" >
<animate attributeName="cx" dur="3" values="3%;97%;3%"
repeatCount="indefinite" />
<animate attributeName="cy" dur="2.8" values="3%;97%;3%"
repeatCount="indefinite" />
</circle>
<circle cx="30%" cy="70%" r="3%" fill="url(#gradR)" >
<animate attributeName="cx" dur="2.7" values="97%;3%;97%"
repeatCount="indefinite" />
<animate attributeName="cy" dur="3.1" values="3%;97%;3%"
repeatCount="indefinite" />
</circle>
<radialGradient id="gradB" cx="20%" cy="20%" r="100%" fx="30%" fy="30%">
<stop stop-color="white" offset="0"/>
<stop stop-color="blue" offset="25%"/>
<stop stop-color="rgb(0,192)" offset="50%"/>
<stop stop-color="rgb(0,127)" offset="70%"/>
<stop stop-color="rgb(0,64)" offset="85%"/>
<stop stop-color="rgb(0,0)" offset="100%"/>
</radialGradient>
<radialGradient id="gradR" cx="20%" cy="20%" r="100%" fx="30%" fy="30%">
<stop stop-color="white" offset="0"/>
<stop stop-color="red" offset="25%"/>
<stop stop-color="rgb(192,0)" offset="50%"/>
<stop stop-color="rgb(127,0)" offset="70%"/>
<stop stop-color="rgb(64,0)" offset="85%"/>
<stop stop-color="rgb(0,0)" offset="100%"/>
</radialGradient>
</svg>
本文链接：https://www.f2er.com/2939572.html
