// GraphURL2D returns a link to a bar graph displaying particular graph data.
// GraphURL2D returns nil if given graph data of length 0 in either dimension.
func (b *BarGraph) GraphURL2D(gd GraphData2D) *url.URL {
xlength := gd.XLen()
ylength := gd.YLen()
if xlength <= 0 || ylength <= 0 {
return nil
}
labels := make([]string, xlength)
titles := make([]string, ylength)
values := make([][]int64, ylength)
var includeChdl bool
for y := range values {
titles[y] = gd.YLabel(y)
if titles[y] != "" {
includeChdl = true
}
values[y] = make([]int64, xlength)
}
for x := range labels {
labels[x] = gd.XLabel(x)
for y := range values {
values[y][x] = gd.Value(x, y)
}
}
max := maxInt64(values...)
if max == 0 {
max = 1
}
for i := 0; i < b.Scale; i++ {
max = (max + 9) / 10
}
actualMax := max
for i := 0; i < b.Scale; i++ {
max *= 10
}
encoded := encodeInt64(max, values...)
url, _ := url.Parse("http://chart.apis.google.com/chart")
urlParams := []string{
"chs", "500x250",
"cht", "bvg",
"chco", encodeColors(len(values), b.Palette, ","),
"chd", encoded,
"chxt", "x,y",
"chbh", "a",
"chxr", fmt.Sprintf("1,0,%d", actualMax),
"chxl", fmt.Sprintf("0:|%s", strings.Join(labels, "|")),
"chdl", strings.Join(titles, "|")}
// If we aren't including chdl parameter, chop it off of end of parameter
// list
if !includeChdl {
urlParams = urlParams[:len(urlParams)-2]
}
return http_util.AppendParams(url, urlParams...)
}
// GraphURL returns a link to a pie graph displaying particular graph data.
// GraphURL returns nil if given graph data of length 0.
func (p *PieGraph) GraphURL(gd GraphData) *url.URL {
length := gd.Len()
if length <= 0 {
return nil
}
labels := make([]string, length)
values := make([]int64, length)
for idx := range labels {
labels[idx] = gd.Label(idx)
values[idx] = gd.Value(idx)
}
encoded := encodeInt64(maxInt64(values), values)
url, _ := url.Parse("http://chart.apis.google.com/chart")
return http_util.AppendParams(
url,
"chs", "500x250",
"cht", "p3",
"chco", encodeColors(len(values), p.Palette, "|"),
"chd", encoded,
"chdl", strings.Join(labels, "|"))
}
