Published
Edited
Jan 23, 2019
3 forks
Importers
21 stars
generateBlobs = {
return numBlobs => {
return Array.apply(null, Array(numBlobs)).map((_, i) => {
const color = randomColor()
let backgroundColor = randomColor()
while (backgroundColor === color) {
backgroundColor = randomColor()
}
return {
xPosition: (i%Math.floor(numColumns))*(canvasWidth/numColumns),
yPosition: Math.floor(i/numColumns)*canvasHeight/numRows,
size: canvasHeight/(numBlobs/numColumns)/3,
amplitude: Math.random() * 0.4,
numPoints: 4,
speed: Math.random() * 0.1,
rotationSpeed: Math.random() * 0.3,
period: Math.PI * Math.ceil(Math.random() * 20) * 2,
color,
backgroundColor
}
})
}
}
blob = {
return ({
xPosition=canvasWidth/2,
yPosition=canvasHeight/2,
size=10,
amplitude=0.1,
numPoints=4,
speed=0.01,
period=Math.PI*2,
rotationSpeed=0.05,
color='#ffffff',
backgroundColor='#000000',
className=''}) => {
const controlPointDist = (4/3)*Math.tan(Math.PI/(numPoints*2))
const time = frame * speed
const rotation = frame * rotationSpeed
const points = [
{
x: 1 + Math.sin(time) * amplitude,
y: 0,
controlPoints: [
{
x: 1+Math.sin(time)*amplitude-Math.sin(time+(period/12)*1)*amplitude,
y: -controlPointDist-Math.sin(time+(period/12)*1)*amplitude
},
{
x: 1+Math.sin(time)*amplitude+Math.sin(time+(period/12)*1)*amplitude,
y: controlPointDist+Math.sin(time+(period/12)*1)*amplitude
}
]
},
{
x: 0,
y: 1+Math.sin(time+(period/12)*3) * amplitude,
controlPoints: [
{
x: controlPointDist+Math.sin(time+(period/12)*2)*amplitude,
y: 1+Math.sin(time+(period/12)*2)*amplitude
},
{
x: -controlPointDist+Math.sin(time+(period/12)*3)*amplitude,
y: 1+Math.sin(time+(period/12)*3)*amplitude
}
]
},
{
x: -1+Math.sin(time+(period/12)*6) * amplitude,
y: 0,
controlPoints: [
{
x: -1+Math.sin(time+(period/12)*5)*amplitude,
y: controlPointDist+Math.sin(time+(period/12)*5)*amplitude
},
{
x: -1+Math.sin(time+(period/12)*7)*amplitude,
y: -controlPointDist+Math.sin(time+(period/12)*7)*amplitude
}
]
},
{
x: 0,
y: -1+Math.sin(time+(period/12)*9) * amplitude,
controlPoints: [
{
x: -controlPointDist+Math.sin(time+(period/12)*8)*amplitude,
y: -1+Math.sin(time+(period/12)*8)*amplitude
},
{
x: controlPointDist+Math.sin(time+(period/12)*10)*amplitude,
y: -1+Math.sin(time+(period/12)*10)*amplitude
}
]
},
]
return `
${backgroundColor && `
<rect x="${xPosition}"
y="${yPosition}"
width="${canvasWidth/numColumns}"
height="${canvasHeight/numRows}"
fill="${backgroundColor}" />
`}
<g transform="translate(${xPosition+canvasWidth/numColumns/2} ${yPosition+canvasHeight/numRows/2})
scale(${size} ${size})
rotate(${rotation})">
<path
class="${className}"
d="
M ${points[0].x} ${points[0].y}
C ${points[0].controlPoints[1].x} ${points[0].controlPoints[1].y}
${points[1].controlPoints[0].x} ${points[1].controlPoints[0].y}
${points[1].x} ${points[1].y}
S ${points[2].controlPoints[0].x} ${points[2].controlPoints[0].y}
${points[2].x} ${points[2].y}
S ${points[3].controlPoints[0].x} ${points[3].controlPoints[0].y}
${points[3].x} ${points[3].y}
S ${points[0].controlPoints[0].x} ${points[0].controlPoints[0].y}
${points[0].x} ${points[0].y}
Z"
fill="${color}"/>
${showGuides && `
${points.map((point, i) => `
<line x1="${point.x}" y1="${point.y}"
x2="${point.controlPoints[0].x}" y2="${point.controlPoints[0].y}"
stroke="#ff0000"
stroke-width="0.02" />
<circle cx="${point.controlPoints[0].x}" cy="${point.controlPoints[0].y}"
r="0.05"
fill="#ff0000" />
${i == 0 && `
<line x1="${point.x}" y1="${point.y}"
x2="${point.controlPoints[1].x}" y2="${point.controlPoints[1].y}"
stroke="#0000ff"
stroke-width="0.02" />
<circle cx="${point.controlPoints[1].x}" cy="${point.controlPoints[1].y}"
r="0.05"
fill="#0000ff" />
`
}
<circle cx="${point.x}" cy="${point.y}"
r="0.05"
fill="#ff0000" />
`)}
`
}
</g>
`
}
}
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