func (p *paddle) draw(canvasEl *dom.HTMLCanvasElement) {
newYPos := p.yPos + p.yMovement
if newYPos > 5 && newYPos < (canvasEl.Height-p.height-5) {
p.yPos = newYPos
}
ctx := canvasEl.GetContext2d()
ctx.FillStyle = "#0000ff"
ctx.FillRect(p.xPos, p.yPos, p.width, p.height)
}
func (b *ball) draw(canvasEl *dom.HTMLCanvasElement) {
b.xPos += int(math.Floor(b.xMovement + 0.5))
b.yPos += int(math.Floor(b.yMovement + 0.5))
ctx := canvasEl.GetContext2d()
ctx.FillStyle = "red"
ctx.BeginPath()
ctx.Arc(b.xPos, b.yPos, b.radius, 0, 6, false)
ctx.Fill()
ctx.ClosePath()
}