forked from OrgGo/goplot
72 lines
1.6 KiB
Go
72 lines
1.6 KiB
Go
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package main
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import (
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"encoding/json"
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"fmt"
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)
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type lineDataSetsType struct {
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FillColor string `json:"fillColor"`
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StrokeColor string `json:"strokeColor"`
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PointColor string `json:"pointColor"`
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PointStrokeColor string `json:"pointStrokeColor"`
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Data []int `json:"data"`
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}
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type lineDataType struct {
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Labels []string `json:"labels"`
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Datasets []*lineDataSetsType `json:"datasets"`
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}
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type LineChart struct {
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name string
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}
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func (l *LineChart) Canvas(name string, height int, width int) string {
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if height == 0 {
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height = 300
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}
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if width == 0 {
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width = 400
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}
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return fmt.Sprintf("<canvas id=\"%s\" height=\"%d\" width=\"%d\"></canvas>", name, height, width)
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}
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func (l *LineChart) JsonCode(c *ChartDataType) (string, error) {
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lines := new(lineDataType)
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lineNum := c.ValueNum()
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lines.Labels = c.ItemName()
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lines.Datasets = make([]*lineDataSetsType, 0, lineNum)
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for i := 0; i < lineNum; i++ {
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line := &lineDataSetsType{}
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line.FillColor = "rgba(220,220,220,0)"
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line.StrokeColor = GetColorValue(i)
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line.PointColor = GetColorValue(i)
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line.PointStrokeColor = "#fff"
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line.Data = c.ItemValue(i)
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lines.Datasets = append(lines.Datasets, line)
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}
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b, err := json.Marshal(lines)
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("var lineJsonStr = '%s';", string(b)), nil
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}
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func (l *LineChart) NewChart(name string) string {
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return fmt.Sprintf("new Chart(document.getElementById(\"%s\").getContext(\"2d\")).Line(eval('('+lineJsonStr+')'));", name)
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}
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func init() {
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line := new(LineChart)
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line.name = "line"
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ChartHandlers["line"] = line
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}
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