Example #1
0
File: canvas.go Project: zzn01/plot
// NewFormattedCanvas creates a new vg.CanvasWriterTo with the specified
// image format.
//
// Supported formats are:
//
//  eps, jpg|jpeg, pdf, png, svg, and tif|tiff.
func NewFormattedCanvas(w, h vg.Length, format string) (vg.CanvasWriterTo, error) {
	var c vg.CanvasWriterTo
	switch format {
	case "eps":
		c = vgeps.New(w, h)

	case "jpg", "jpeg":
		c = vgimg.JpegCanvas{Canvas: vgimg.New(w, h)}

	case "pdf":
		c = vgpdf.New(w, h)

	case "png":
		c = vgimg.PngCanvas{Canvas: vgimg.New(w, h)}

	case "svg":
		c = vgsvg.New(w, h)

	case "tif", "tiff":
		c = vgimg.TiffCanvas{Canvas: vgimg.New(w, h)}

	default:
		return nil, fmt.Errorf("unsupported format: %q", format)
	}
	return c, nil
}
Example #2
0
// WriterTo returns an io.WriterTo that will write the plot as
// the specified image format.
//
// Supported formats are:
//
//  eps, jpg|jpeg, pdf, png, svg, and tif|tiff.
func (p *Plot) WriterTo(w, h vg.Length, format string) (io.WriterTo, error) {
	var c interface {
		vg.CanvasSizer
		io.WriterTo
	}
	switch format {
	case "eps":
		c = vgeps.New(w, h)

	case "jpg", "jpeg":
		c = vgimg.JpegCanvas{Canvas: vgimg.New(w, h)}

	case "pdf":
		c = vgpdf.New(w, h)

	case "png":
		c = vgimg.PngCanvas{Canvas: vgimg.New(w, h)}

	case "svg":
		c = vgsvg.New(w, h)

	case "tif", "tiff":
		c = vgimg.TiffCanvas{Canvas: vgimg.New(w, h)}

	default:
		return nil, fmt.Errorf("unsupported format: %q", format)
	}
	p.Draw(draw.New(c))

	return c, nil
}