Function Example

palette/moreland/example_test.go:50–140

This Example gives examples of plots using the palettes in this package. The output can be found at https://github.com/gonum/plot/blob/master/palette/moreland/testdata/moreland_golden.png.

()

// The output can be found at
// https://github.com/gonum/plot/blob/master/palette/moreland/testdata/moreland_golden.png.
func Example() {
	m := offsetUnitGrid{
		XOffset: -50,
		YOffset: -50,
		Data:    mat.NewDense(100, 100, nil),
	}
	for i := range 100 {
		for j := range 100 {
			x := float64(i-50) / 10
			y := float64(j-50) / 10
			v := math.Sin(x*x+y*y) / (x*x + y*y)
			m.Data.Set(i, j, v)
		}
	}

	const (
		rows = 3
		cols = 3
	)
	c := vgimg.New(vg.Points(800), vg.Points(800))
	dc := draw.New(c)
	tiles := draw.Tiles{
		Rows: rows,
		Cols: cols,
	}
	type paletteHolder struct {
		name string
		cmap palette.Palette
	}
	palettes := []paletteHolder{
		{
			name: "SmoothBlueRed",
			cmap: moreland.SmoothBlueRed().Palette(255),
		},
		{
			name: "SmoothBlueTan",
			cmap: moreland.SmoothBlueTan().Palette(255),
		},
		{
			name: "SmoothGreenPurple",
			cmap: moreland.SmoothGreenPurple().Palette(255),
		},
		{
			name: "SmoothGreenRed",
			cmap: moreland.SmoothGreenRed().Palette(255),
		},
		{
			name: "SmoothPurpleOrange",
			cmap: moreland.SmoothPurpleOrange().Palette(255),
		},
		{
			name: "BlackBody",
			cmap: moreland.BlackBody().Palette(255),
		},
		{
			name: "ExtendedBlackBody",
			cmap: moreland.ExtendedBlackBody().Palette(255),
		},