A plugin for svg.js adding filter functionality.
svg.filter.js is licensed under the terms of the MIT License.
npm i @svgdotjs/svg.filter.js
yarn add @svgdotjs/svg.filter.js
Include this plugin after including the svg.js library in your html document.
Here is how each filter effect on the example page is achieved.
var image = draw.image('path/to/image.jpg').size(300, 300)
image.filterWith(function(add) {
add.gaussianBlur(30)
})
image.filterWith(function(add) {
add.gaussianBlur(30, 0)
})
image.filterWith(function(add) {
add.colorMatrix('saturate', 0)
})
image.filterWith(function(add) {
var amount = 1.5
add.componentTransfer({
type: 'linear',
slope: amount,
intercept: -(0.3 * amount) + 0.3
})
})
image.filterWith(function(add) {
add.colorMatrix('matrix', [ .343, .669, .119, 0, 0
, .249, .626, .130, 0, 0
, .172, .334, .111, 0, 0
, .000, .000, .000, 1, 0 ])
})
image.filterWith(function(add) {
add.colorMatrix('hueRotate', 180)
})
image.filterWith(function(add) {
add.colorMatrix('luminanceToAlpha')
})
image.filterWith(function(add) {
add.colorMatrix('matrix', [ 1.0, 0, 0, 0, 0
, 0, 0.2, 0, 0, 0
, 0, 0, 0.2, 0, 0
, 0, 0, 0, 1.0, 0 ])
})
image.filterWith(function(add) {
add.componentTransfer({
type: 'discrete',
tableValues: [0, 0.2, 0.4, 0.6, 0.8, 1]
})
})
image.filterWith(function(add) {
add.componentTransfer({
type: 'linear',
slope: 0.2
})
})
image.filterWith(function(add) {
add.componentTransfer({
type: 'linear',
slope: 1.5,
intercept: 0.2
})
})
image.filterWith(function(add) {
add.componentTransfer({
type: 'table'
tableValues: [1, 0]
})
})
image.filterWith(function(add) {
add.componentTransfer({
g: { type: 'gamma', amplitude: 1, exponent: 0.5 }
})
})
image.filterWith(function(add) {
add.componentTransfer({
g: { type: 'gamma', amplitude: 1, exponent: 0.5, offset: -0.1 }
})
})
You will notice that all the effect descriptions have a drop shadow. Here is how this drop shadow can be achieved:
var text = draw.text('SVG text with drop shadow').fill('#fff')
text.filterWith(function(add) {
var blur = add.offset(0, 1).in(add.$sourceAlpha).gaussianBlur(1)
add.blend(add.$source, blur)
})
This technique can be achieved on any other shape of course:
var rect = draw.rect(100,100).fill('#f09').stroke({ width: 3, color: '#0f9' }).move(10,10)
rect.filterWith(function(add) {
var blur = add.offset(20, 20).in(add.$sourceAlpha).gaussianBlur(5)
add.blend(add.$source, blur)
this.size('200%','200%').move('-50%', '-50%')
})
If the drop shadow should get the colour of the shape so it appears like coloured glass:
var rect = draw.rect(100,100).fill('#f09').stroke({ width: 3, color: '#0f9' }).move(10,10)
rect.filterWith(function(add) {
var blur = add.offset(20, 20).gaussianBlur(5)
add.blend(add.$source, blur)
this.size('200%','200%').move('-50%', '-50%')
})
image.filterWith(function(add){
var matrix = add.convolveMatrix([
1,0,0,0,0,0,
0,1,0,0,0,0,
0,0,1,0,0,0,
0,0,0,1,0,0,
0,0,0,0,1,0,
0,0,0,0,0,1
]).attr({
devisor: '2',
preserveAlpha: 'false'
}).in(add.$sourceAlpha)
//recolor it
var color = add.composite(add.flood('#ff2222'),matrix,'in');
//merge all of them toggether
add.merge(color,add.$source);
})
Some more features you should know about.
The unfilter
method removes the filter attribute from the node:
image.unfilter()
its also posible to create a filter by using the new
keyword
NOTE: when creating a filter this way, it can take an optional attr object
var filter = new SVG.Filter();
// create the filters effects here
filter.offset(20, 20).gaussianBlur(5);
filter.blend(filter.$source, blur);
filter.size('200%','200%').move('-50%', '-50%')
then once you have created the filter you can use it one multiple elements
var image = new SVG.Image();
var shape = new SVG.Rect(10, 10);
image.filterWith(filter);
shape.filterWith(filter);
An internal reference to the filter node is made in the element:
image.filterer()
This can also be very useful to reuse an existing filter on various elements:
otherimage.filterWith(image.filterer())
Every filter value can be animated as well:
var hueRotate
image.filterWith(function(add) {
hueRotate = add.colorMatrix('hueRotate', 0)
})
hueRotate.animate(3000).attr('values', 360)
Method chaining is a programing style where each function returns the object it belongs to, for an example look at JQuery.
it's possible to chain the effects on a filter when you are creating them, for example:
image.filterWith(function(add){
add.flood('black',0.5).composite(add.$sourceAlpha,'in').offset(10).merge(add.$source)
})
this would create a basic shadow filter where the first input on the composite
effect would be the flood
effect, and the input on the offset effect would be the composite
effect.
same with the merge
effect, its first input would be the offset
effect, and its second input would be add.$source
some effects like Merge, Blend, Composite, DisplacementMap have thier arguments changed when they are chained, for example
image.filterWith(function(add){
add.flood('black',0.5).composite(add.$sourceAlpha,'in')
})
the composite
effects first input is set to the flood
effect and its second input becomes the first argument, this is the same for the merge, blend, composite, and displacmentMap effect.
for more details check out each effects doc below
gets or sets the in
attribute of the effect
effect: this can be another effect or a string
if effect is not provided it will look for another effect on the same filter whose result
is equal to this effects in
attribute, else it will return the value of the in
attribute
image.filterWith(function(add){
var offset = add.offset(10)
//create the blur effect and then set its input
var blur = add.gaussianBlur(3)
//set the input to an effect
blur.in(offset)
//this will return the offset effect
var input = blur.in()
//set the input to a string
blur.in('another-result-as-a-string')
//this will return a string since there is no other effect which has a matching result attribute
var input2 = blur.in()
})
gets or sets the in2
attribute of the effect
this function works the same as the in method.
it's only on effects (Blend, Composite, and DisplacementMap)
gets or sets the result
attribute of the effect
result
attribute. result
attributefilter.blend(in1, in2, mode)
//or
new SVG.BlendEffect({in1, in2, mode})
chaining when this effect is called right after another effect, for example:
filter.offset(10).blend(filter.$source)
the first input is set to the offset
effect and the second input is set to filter.$source
or what ever was passed as the first argument, and the second input becomes the mode
filter.colorMatrix(type, values);
//or
new SVG.ColorMatrixEffect({type, values});
filter.componentTransfer(components);
// or
filter.componentTransfer(function (add) { add.funcA({ type... }) });
//or
new SVG.ComponentTransferEffect();
components: an object which is set for all chanels or r
, g
, b
, a
properties for each chanel
type: "identity | table | discrete | linear | gamma",
//type="table"
tableValues: "0 0.5 2 1", //number separated by spaces
//type="linear"
slope: 1, //number
intercept: 3,//number
//type="gamma"
amplitude: 0, //number
exponent: 0, //number
offset: 0 //number
}
filter.composite(in1, in2, operator);
//or
new SVG.CompositeEffect({in1, in2, operator});
chaining when this effect is called right after another effect, for example:
filter.flood('black',0.5).composite(filter.$sourceAlpha,'in')
the first input is set to the flood
effect and the second input is set to filter.$sourceAlpha
or what ever was passed as the first argument.
also the second argument becomes the operator
filter.convolveMatrix(matrix);
//or
new SVG.ConvolveMatrixEffect({matrix});
[
1,0,0,
0,1,0,
0,0,1
]
filter.diffuseLighting(surfaceScale, lightingColor, diffuseConstant, kernelUnitLength);
//or
new SVG.DiffuseLightingEffect({surfaceScale, lightingColor, diffuseConstant, kernelUnitLength});
very complicated, just check out the W3 doc
filter.displacementMap(in1, in2, scale, xChannelSelector, yChannelSelector);
//or
new SVG.DisplacementMapEffect({in1, in2, scale, xChannelSelector, yChannelSelector});
very complicated, just check out the W3 doc
chaining when this effect is called right after another effect, for example:
filter.offset(20,50).displacementMap(filter.$source,2)
the first input is set to the offset
effect and the second input is set to filter.$source
or what ever was passed as the first argument.
also the second argument becomes the scale, and the third argument is the xChannelSelector and so on
filter.flood(color,opacity);
//or
new SVG.FloodEffect(color,opacity);
filter.gaussianBlur(x, y);
//or
new SVG.GaussianBlurEffect({x, y});
filter.image(src);
//or
new SVG.ImageEffect({src});
filter.merge();
//or
new SVG.MergeEffect();
filter.merge([effectOne,"result-two",another_effect])
filter.offset(10).merge(anotherEffect)
which will result in a merge effect with its first input set to the offset
effect and its second input set to anotherEffect
filter.morphology(operator, radius);
//or
new SVG.MorphologyEffect({operator, radius});
filter.offset(x, y);
//or
new SVG.OffsetEffect({x, y});
filter.specularLighting(surfaceScale, lightingColor, diffuseConstant, specularExponent, kernelUnitLength);
//or
new SVG.SpecularLightingEffect(surfaceScale, lightingColor, diffuseConstant, specularExponent, kernelUnitLength);
very complicated, just check out the W3 doc
filter.tile();
//or
new SVG.TileEffect();
no arguments, but if you want to find out what it does check out the W3 doc
filter.turbulence(baseFrequency, numOctaves, seed, stitchTiles, type);
//or
new SVG.TurbulenceEffect({baseFrequency, numOctaves, seed, stitchTiles, type});
very complicated, just check out the W3 doc