goplot/pie.go

59 lines
1.1 KiB
Go

package main
import (
"encoding/json"
"fmt"
)
type pieDataSetsType struct {
Color string `json:"color"`
Value int `json:"value"`
}
type PieChart struct {
name string
}
func (b *PieChart) Canvas(name string, height int, width int) string {
if height == 0 {
height = 300
}
if width == 0 {
width = 400
}
return fmt.Sprintf("<canvas id=\"%s\" height=\"%d\" width=\"%d\"></canvas>", name, height, width)
}
func (l *PieChart) JsonCode(c *ChartDataType) (string, error) {
pieNum := c.ItemNum()
items := c.ItemValue(0)
datasets := make([]*pieDataSetsType, 0, pieNum)
for i := 0; i < pieNum; i++ {
pie := &pieDataSetsType{}
pie.Color = GetColorValue(i)
pie.Value = items[i]
datasets = append(datasets, pie)
}
b, err := json.Marshal(datasets)
if err != nil {
return "", err
}
return fmt.Sprintf("var pieJsonStr = '%s';", string(b)), nil
}
func (l *PieChart) NewChart(name string) string {
return fmt.Sprintf("new Chart(document.getElementById(\"%s\").getContext(\"2d\")).Pie(eval('('+pieJsonStr+')'));", name)
}
func init() {
pie := new(PieChart)
pie.name = "pie"
ChartHandlers["pie"] = pie
}