code: func (c *ColorM) Translate(r, g, b, a float32) *ColorM {
  	if !c.isInited() {
  		return &ColorM{
  			translate: []float32{r, g, b, a},
  		}
  	}
  	es := make([]float32, len(colorMIdentityTranslate))
  	if c.translate != nil {
  		copy(es, c.translate)
  	}
  	es[0] += r
  	es[1] += g
  	es[2] += b
  	es[3] += a
  	return &ColorM{
  		body:      c.body,
  		translate: es,
  	}
  }
docs: // Translate translates the matrix by (r, g, b, a).