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Never panic in Plot, return an error instead

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This commit is contained in:
Christian Muehlhaeuser
2018-06-06 00:49:26 +02:00
parent 8f4a4acbca
commit 144a85a37f
1 changed files with 5 additions and 8 deletions
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13
plotter.go
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@@ -13,7 +13,7 @@ import (
// The Plotter interface lets you implement your own plotters
type Plotter interface {
Plot(cc clusters.Clusters, iteration int)
Plot(cc clusters.Clusters, iteration int) error
}
// SimplePlotter is the default standard plotter for 2-dimensional data sets
@@ -34,8 +34,8 @@ var colors = []drawing.Color{
drawing.ColorFromHex("4b7509"),
}
// Plot draw a 2-dimensional data set into a PNG file named {iteration}.png
func (p SimplePlotter) Plot(cc clusters.Clusters, iteration int) {
// Plot draw a 2-dimensional data set into a PNG file named {k_iteration}.png
func (p SimplePlotter) Plot(cc clusters.Clusters, iteration int) error {
var series []chart.Series
// draw data points
@@ -83,10 +83,7 @@ func (p SimplePlotter) Plot(cc clusters.Clusters, iteration int) {
buffer := bytes.NewBuffer([]byte{})
err := graph.Render(chart.PNG, buffer)
if err != nil {
panic(err)
}
err = ioutil.WriteFile(fmt.Sprintf("%d_%d.png", len(cc), iteration), buffer.Bytes(), 0644)
if err != nil {
panic(err)
return err
}
return ioutil.WriteFile(fmt.Sprintf("%d_%d.png", len(cc), iteration), buffer.Bytes(), 0644)
}