// 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) {
c, err := draw.NewFormattedCanvas(w, h, format)
if err != nil {
return nil, err
}
p.Draw(draw.New(c))
return c, nil
}
func main() {
const (
p = 1 * vg.Centimeter
nrows = 4
ncols = 5
)
for _, f := range formats {
c, err := draw.NewFormattedCanvas(10*ncols*vg.Centimeter,
10*nrows*vg.Centimeter, f)
if err != nil {
log.Fatal(err)
}
dc := draw.New(c)
tiles := draw.Tiles{
Rows: nrows, Cols: ncols,
PadTop: p, PadBottom: p,
PadRight: p, PadLeft: p,
PadX: p, PadY: p,
}
ii := 0
for j := 0; j < nrows; j++ {
for i := 0; i < ncols; i++ {
if ii < len(examples) {
ex := examples[ii]
ex.p.Draw(tiles.At(dc, i, j))
if err != nil {
log.Fatalf("failed to draw tile for %s.%s: %v", ex.name, f, err)
}
ii++
}
}
}
w, err := os.Create("examples." + f)
if err != nil {
log.Fatal(err)
}
_, err = c.WriteTo(w)
if err != nil {
log.Fatal(err)
}
}
}