func main() {
dom.OnDOMContentLoaded(func() {
s := dom.GetElementById("gopherjs")
style := dom.GetComputedStyle(s)
el := canvas.New(dom.CreateElement("canvas").Object)
cw, _ = strconv.ParseFloat(style.GetPropertyValue("width")[:3], 64)
ch, _ = strconv.ParseFloat(style.GetPropertyValue("height")[:3], 64)
el.Width = int(cw)
el.Height = int(ch)
el.AddEventListener(dom.EvtMousemove, func(e *dom.Event) {
e.PreventDefault()
x := float64(e.LayerX)
y := float64(e.LayerY)
makeParticles(x, y, 5)
})
ctx = el.GetContext2D()
ctx.GlobalCompositeOperation = canvas.CompositeLighter
s.AppendChild(el.Element)
raf.RequestAnimationFrame(run)
})
}
func main() {
dom.OnDOMContentLoaded(func() {
s := dom.Body()
// set full window and black background
s.Style.SetProperty("margin", "0")
s.Style.SetProperty("background", "#222")
el := canvas.New(dom.CreateElement("canvas").Object)
cw = float64(dom.Window().InnerWidth)
ch = float64(dom.Window().InnerHeight)
el.Width = int(cw)
el.Height = int(ch)
el.AddEventListener(dom.EvtMousemove, func(e *dom.Event) {
e.PreventDefault()
x := float64(e.ClientX)
y := float64(e.ClientY)
makeParticles(x, y, 5)
})
ctx = el.GetContext2D()
ctx.GlobalCompositeOperation = canvas.CompositeLighter
dom.Body().AppendChild(el.Element)
raf.RequestAnimationFrame(run)
})
}