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Nikolay 2021-02-27 16:08:16 +00:00 committed by GitHub
parent 594a8f6c77
commit 5c68ccd42b
2 changed files with 23 additions and 9 deletions
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calendarheatmap
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32
charts/colorscale.go
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@ -23,6 +23,20 @@ func (c BasicColorScale) GetColor(val float64) color.RGBA {
return c[idx]
}
func uint8FromStr(s string) (uint8, error) {
v, err := strconv.Atoi(s)
if err != nil {
return 0, errors.New("can not convert to int")
}
if v < 0 {
return 0, errors.New("less than 0")
}
if v > math.MaxUint8 {
return 0, errors.New("higher than max")
}
return uint8(v), nil
}
// NewBasicColorscaleFromCSVFile loads basic colorscale from CSV file
func NewBasicColorscaleFromCSVFile(path string) (BasicColorScale, error) {
colorscaleReader, err := os.Open(path)
@ -51,21 +65,21 @@ func NewBasicColorscaleFromCSVFile(path string) (BasicColorScale, error) {
return nil, errors.New("missing B column")
}
colorscale := make(BasicColorScale, 0)
for _, vals := range rows[1:] {
r, err := strconv.Atoi(vals[colmap["R"]])
colorscale := make(BasicColorScale, len(rows)-1)
for i, vals := range rows[1:] {
r, err := uint8FromStr(vals[colmap["R"]])
if err != nil {
return nil, errors.New("bad value for color")
return nil, fmt.Errorf("bad value for color: %w", err)
}
g, err := strconv.Atoi(vals[colmap["G"]])
g, err := uint8FromStr(vals[colmap["G"]])
if err != nil {
return nil, errors.New("bad value for color")
return nil, fmt.Errorf("bad value for color: %w", err)
}
b, err := strconv.Atoi(vals[colmap["B"]])
b, err := uint8FromStr(vals[colmap["B"]])
if err != nil {
return nil, errors.New("bad value for color")
return nil, fmt.Errorf("bad value for color: %w", err)
}
colorscale = append(colorscale, color.RGBA{R: uint8(r), G: uint8(g), B: uint8(b), A: 255})
colorscale[i] = color.RGBA{r, g, b, 255}
}
return colorscale, nil
}