I have two SVG rectangles; two of their corners are connected by a SVGLine, and I am trying to animate the whole.
Now the rectangles are moving to a new position using the Element.animate()
function (the new positions have to be computed at runtime so I think it is only possible with the animate()
function in JS?).
Until that point everything works fine, but when I try to animate the line so that it is still connecting the corners during the animation, it won´t move.
Is there any way to animate the lines movement to the new position? (I can´t just set the attribute to the new position).
If I have to use a <path>
or <polyline>
or something for that a quick explanation on how I should do that would be great, as path.animate([{points:...},{points:...}],{...})
also didn't move the path as i wanted.
This is a quick code example which I think should work, but the line won't move.
let svg = document.querySelector("#theSVG");
const SVGNS = "http://www.w3.org/2000/svg";
function drawing() {
let rect = document.createElementNS(SVGNS, "rect");
rect.setAttribute("x", 100);
rect.setAttribute("y", 100);
rect.setAttribute("width", 100);
rect.setAttribute("height", 100);
rect.setAttribute("stroke", "black");
svg.appendChild(rect);
let rect2 = document.createElementNS(SVGNS, "rect");
rect2.setAttribute("x", 10);
rect2.setAttribute("y", 10);
rect2.setAttribute("width", 50);
rect2.setAttribute("height", 25);
rect2.setAttribute("stroke", "black");
svg.appendChild(rect2);
let line = document.createElementNS(SVGNS, "line");
line.setAttribute("x1", rect.x.baseVal.value);
line.setAttribute("x2", rect2.x.baseVal.value);
line.setAttribute("y1", rect.y.baseVal.value);
line.setAttribute("y2", rect2.y.baseVal.value);
line.setAttribute("stroke", "darkgray");
svg.appendChild(line);
rect.animate([{
x: rect.x.baseVal.value
}, {
x: '200px'
}], {
duration: 5000,
iterations: 1
});
rect2.animate([{
y: rect2.y.baseVal.value
}, {
y: '300px'
}], {
duration: 5000,
iterations: 1
});
line.animate([{
x1: line.x1.baseVal.value,
y2: line.y2.baseVal.value
}, {
x1: '200px',
y2: '300px'
}], {
duration: 5000,
iterations: 1
});
}
drawing();
<svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 700 360" id="theSVG">
</svg>
CodePudding user response:
You can only animate()
CSS properties. From SVG, only presentational attributes are mapped to CSS. <line>
's x1
,x2
,y1
and y2
are (weirdly) absent of this list...
You should be able to replace this element with a <path>
though, animating its d
attribute.
let svg = document.querySelector("#theSVG");
const SVGNS = "http://www.w3.org/2000/svg";
function drawing() {
let rect = document.createElementNS(SVGNS, "rect");
rect.setAttribute("x", 100);
rect.setAttribute("y", 100);
rect.setAttribute("width", 100);
rect.setAttribute("height", 100);
rect.setAttribute("stroke", "black");
svg.appendChild(rect);
let rect2 = document.createElementNS(SVGNS, "rect");
rect2.setAttribute("x", 10);
rect2.setAttribute("y", 10);
rect2.setAttribute("width", 50);
rect2.setAttribute("height", 25);
rect2.setAttribute("stroke", "black");
svg.appendChild(rect2);
let line = document.createElementNS(SVGNS, "path");
line.setAttribute("d", `
M${ rect.x.baseVal.value } ${ rect.y.baseVal.value }
L${ rect2.x.baseVal.value } ${ rect2.y.baseVal.value }
`);
line.setAttribute("stroke", "darkgray");
svg.appendChild(line);
rect.animate([{
x: '200px'
}], {
duration: 5000,
iterations: 1
});
rect2.animate([{
y: '300px'
}], {
duration: 5000,
iterations: 1
});
line.animate([{
d: `path("M200 ${ rect.y.baseVal.value }L${ rect2.x.baseVal.value } 300")`
}], {
duration: 5000,
iterations: 1
});
}
drawing();
<svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 700 360" id="theSVG">
</svg>
But only Chromium based browsers do support CSS path()
for the d
property...
So you may have to switch to SMIL animations instead:
let svg = document.querySelector("#theSVG");
const SVGNS = "http://www.w3.org/2000/svg";
function drawing() {
const rect = document.createElementNS(SVGNS, "rect");
rect.setAttribute("x", 100);
rect.setAttribute("y", 100);
rect.setAttribute("width", 100);
rect.setAttribute("height", 100);
rect.setAttribute("stroke", "black");
svg.appendChild(rect);
const rectAnimateX = document.createElementNS(SVGNS, "animate");
rectAnimateX.setAttribute("attributeName", "x");
rectAnimateX.setAttribute("values", "100;200");
rectAnimateX.setAttribute("dur", "5s");
rect.append(rectAnimateX);
let rect2 = document.createElementNS(SVGNS, "rect");
rect2.setAttribute("x", 10);
rect2.setAttribute("y", 10);
rect2.setAttribute("width", 50);
rect2.setAttribute("height", 25);
rect2.setAttribute("stroke", "black");
svg.appendChild(rect2);
const rectAnimateY = document.createElementNS(SVGNS, "animate");
rectAnimateY.setAttribute("attributeName", "y");
rectAnimateY.setAttribute("values", "10;300");
rectAnimateY.setAttribute("dur", "5s");
rect2.append(rectAnimateY);
const line = document.createElementNS(SVGNS, "line");
line.setAttribute("x1", rect.x.baseVal.value);
line.setAttribute("y1", rect.y.baseVal.value);
line.setAttribute("x2", rect2.x.baseVal.value);
line.setAttribute("y2", rect2.y.baseVal.value);
line.setAttribute("stroke", "darkgray");
svg.appendChild(line);
const lineAnimateX1 = document.createElementNS(SVGNS, "animate");
lineAnimateX1.setAttribute("attributeName", "x1");
lineAnimateX1.setAttribute("values", `${rect.x.baseVal.value};200`);
lineAnimateX1.setAttribute("dur", "5s");
line.append(lineAnimateX1);
const lineAnimateY2 = document.createElementNS(SVGNS, "animate");
lineAnimateY2.setAttribute("attributeName", "y2");
lineAnimateY2.setAttribute("values", `${rect2.y.baseVal.value};300`);
lineAnimateY2.setAttribute("dur", "5s");
line.append(lineAnimateY2);
}
drawing();
<svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 700 360" id="theSVG">
</svg>