Function newChartScaleX

gui/chart.go:457–490

newChartScaleX creates and returns a pointer to a new chartScaleX for the specified chart, number of lines and color

(chart *Chart, lines int, color *math32.Color)

// newChartScaleX creates and returns a pointer to a new chartScaleX for the specified
// chart, number of lines and color
func newChartScaleX(chart *Chart, lines int, color *math32.Color) *chartScaleX {

	sx := new(chartScaleX)
	sx.chart = chart
	sx.lines = lines
	sx.uniBounds.Init("Bounds")

	// Appends bottom horizontal line
	positions := math32.NewArrayF32(0, 0)
	positions.Append(0, -1+deltaLine, 0, 1, -1+deltaLine, 0)

	// Appends vertical lines
	step := 1 / float32(lines)
	for i := 0; i < lines; i++ {
		nx := float32(i) * step
		if i == 0 {
			nx += deltaLine
		}
		positions.Append(nx, 0, 0, nx, -1, 0)
	}

	// Creates geometry and adds VBO
	geom := geometry.NewGeometry()
	geom.AddVBO(gls.NewVBO(positions).AddAttrib(gls.VertexPosition))

	// Initializes the panel graphic
	gr := graphic.NewGraphic(sx, geom, gls.LINES)
	sx.mat.Init(color)
	gr.AddMaterial(sx, &sx.mat, 0, 0)
	sx.Panel.InitializeGraphic(chart.ContentWidth(), chart.ContentHeight(), gr)

	sx.recalc()
	return sx
}

// recalc recalculates the position and size of this scale inside its parent
func (sx *chartScaleX) recalc() {