func drawCaps(ctx *nanovgo.Context, x, y, width float32) {
caps := []nanovgo.LineCap{nanovgo.Butt, nanovgo.Round, nanovgo.Square}
var lineWidth float32 = 8.0
ctx.Save()
defer ctx.Restore()
ctx.BeginPath()
ctx.Rect(x-lineWidth/2, y, width+lineWidth, 40)
ctx.SetFillColor(nanovgo.RGBA(255, 255, 255, 32))
ctx.Fill()
ctx.BeginPath()
ctx.Rect(x, y, width, 40)
ctx.SetFillColor(nanovgo.RGBA(255, 255, 255, 32))
ctx.Fill()
ctx.SetStrokeWidth(lineWidth)
for i, cap := range caps {
ctx.SetLineCap(cap)
ctx.SetStrokeColor(nanovgo.RGBA(0, 0, 0, 255))
ctx.BeginPath()
ctx.MoveTo(x, y+float32(i)*10+5)
ctx.LineTo(x+width, y+float32(i)*10+5)
ctx.Stroke()
}
}
func drawLines(ctx *nanovgo.Context, x, y, w, h, t float32) {
var pad float32 = 5.0
s := w/9.0 - pad*2
joins := []nanovgo.LineCap{nanovgo.Miter, nanovgo.Round, nanovgo.Bevel}
caps := []nanovgo.LineCap{nanovgo.Butt, nanovgo.Round, nanovgo.Square}
ctx.Save()
defer ctx.Restore()
pts := []float32{
-s*0.25 + cosF(t*0.3)*s*0.5,
sinF(t*0.3) * s * 0.5,
-s * 0.25,
0,
s * 0.25,
0,
s*0.25 + cosF(-t*0.3)*s*0.5,
sinF(-t*0.3) * s * 0.5,
}
for i, cap := range caps {
for j, join := range joins {
fx := x + s*0.5 + float32(i*3+j)/9.0*w + pad
fy := y - s*0.5 + pad
ctx.SetLineCap(cap)
ctx.SetLineJoin(join)
ctx.SetStrokeWidth(s * 0.3)
ctx.SetStrokeColor(nanovgo.RGBA(0, 0, 0, 160))
ctx.BeginPath()
ctx.MoveTo(fx+pts[0], fy+pts[1])
ctx.LineTo(fx+pts[2], fy+pts[3])
ctx.LineTo(fx+pts[4], fy+pts[5])
ctx.LineTo(fx+pts[6], fy+pts[7])
ctx.Stroke()
ctx.SetLineCap(nanovgo.Butt)
ctx.SetLineJoin(nanovgo.Bevel)
ctx.SetStrokeWidth(1.0)
ctx.SetStrokeColor(nanovgo.RGBA(0, 192, 255, 255))
ctx.BeginPath()
ctx.MoveTo(fx+pts[0], fy+pts[1])
ctx.LineTo(fx+pts[2], fy+pts[3])
ctx.LineTo(fx+pts[4], fy+pts[5])
ctx.LineTo(fx+pts[6], fy+pts[7])
ctx.Stroke()
}
}
}
