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) }) }