zeni/go-chart
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removing 3rd party deps.

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This commit is contained in:
Will Charczuk 2016-07-08 17:57:14 -07:00
parent 7f36c08fbf
commit 8bc8b1087c
27 changed files with 1995 additions and 54 deletions
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26
chart.go
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@ -15,6 +15,7 @@ type Chart struct {
Width int
Height int
DPI float64
Background Style
Canvas Style
@ -28,6 +29,17 @@ type Chart struct {
Series []Series
}
// GetDPI returns the dpi for the chart.
func (c Chart) GetDPI(defaults ...float64) float64 {
if c.DPI == 0 {
if len(defaults) > 0 {
return defaults[0]
}
return DefaultDPI
}
return c.DPI
}
// GetFont returns the text font.
func (c Chart) GetFont() (*truetype.Font, error) {
if c.Font == nil {
@ -35,7 +47,7 @@ func (c Chart) GetFont() (*truetype.Font, error) {
if err != nil {
return nil, err
}
c.Font = f
return f, nil
}
return c.Font, nil
}
@ -45,7 +57,10 @@ func (c *Chart) Render(provider RendererProvider, w io.Writer) error {
if len(c.Series) == 0 {
return errors.New("Please provide at least one series")
}
r := provider(c.Width, c.Height)
r, err := provider(c.Width, c.Height)
if err != nil {
return err
}
if c.hasText() {
font, err := c.GetFont()
if err != nil {
@ -53,6 +68,7 @@ func (c *Chart) Render(provider RendererProvider, w io.Writer) error {
}
r.SetFont(font)
}
r.SetDPI(c.GetDPI(DefaultDPI))
canvasBox := c.calculateCanvasBox(r)
xrange, yrange := c.initRanges(canvasBox)
@ -122,7 +138,7 @@ func (c Chart) calculateFinalLabelWidth(r Renderer) int {
}
r.SetFontSize(c.FinalValueLabel.GetFontSize(DefaultFinalLabelFontSize))
textWidth := r.MeasureText(finalLabelText)
textWidth, _ := r.MeasureText(finalLabelText)
asw := c.getAxisWidth()
pl := c.FinalValueLabel.Padding.GetLeft(DefaultFinalLabelPadding.Left)
@ -355,7 +371,7 @@ func (c Chart) drawFinalValueLabel(r Renderer, canvasBox Box, index int, s Serie
ly := yrange.Translate(lv) + py
r.SetFontSize(c.FinalValueLabel.GetFontSize(DefaultFinalLabelFontSize))
textWidth := r.MeasureText(ll)
textWidth, _ := r.MeasureText(ll)
textHeight := int(math.Floor(DefaultFinalLabelFontSize))
halfTextHeight := textHeight >> 1
@ -409,7 +425,7 @@ func (c Chart) drawTitle(r Renderer) error {
r.SetFontColor(c.Canvas.GetFontColor(DefaultTextColor))
titleFontSize := c.Canvas.GetFontSize(DefaultTitleFontSize)
r.SetFontSize(titleFontSize)
textWidth := r.MeasureText(c.Title)
textWidth, _ := r.MeasureText(c.Title)
titleX := (c.Width >> 1) - (textWidth >> 1)
titleY := c.TitleStyle.Padding.GetTop(DefaultTitleTop) + int(titleFontSize)
r.Text(c.Title, titleX, titleY)