descending
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_examples/descending/main.go
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55
_examples/descending/main.go
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@ -0,0 +1,55 @@
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package main
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import (
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"net/http"
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"github.com/wcharczuk/go-chart"
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)
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func drawChart(res http.ResponseWriter, req *http.Request) {
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/*
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The below will draw the same chart as the `basic` example, except with both the x and y axes turned on.
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In this case, both the x and y axis ticks are generated automatically, the x and y ranges are established automatically, the canvas "box" is adjusted to fit the space the axes occupy so as not to clip.
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*/
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graph := chart.Chart{
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Height: 500,
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Width: 500,
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XAxis: chart.XAxis{
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Style: chart.Style{
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Show: true,
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},
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/*Range: &chart.ContinuousRange{
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Descending: true,
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},*/
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},
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YAxis: chart.YAxis{
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Style: chart.Style{
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Show: true,
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},
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Range: &chart.ContinuousRange{
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Descending: true,
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},
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},
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Series: []chart.Series{
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chart.ContinuousSeries{
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Style: chart.Style{
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Show: true,
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StrokeColor: chart.GetDefaultColor(0).WithAlpha(64),
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FillColor: chart.GetDefaultColor(0).WithAlpha(64),
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},
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XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
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YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
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},
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},
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}
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res.Header().Set("Content-Type", "image/png")
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graph.Render(chart.PNG, res)
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}
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func main() {
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http.HandleFunc("/", drawChart)
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http.ListenAndServe(":8080", nil)
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}
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@ -7,9 +7,15 @@ import (
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// ContinuousRange represents a boundary for a set of numbers.
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// ContinuousRange represents a boundary for a set of numbers.
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type ContinuousRange struct {
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type ContinuousRange struct {
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Min float64
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Min float64
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Max float64
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Max float64
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Domain int
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Domain int
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Descending bool
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}
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// IsDescending returns if the range is descending.
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func (r ContinuousRange) IsDescending() bool {
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return r.Descending
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}
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}
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// IsZero returns if the ContinuousRange has been set or not.
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// IsZero returns if the ContinuousRange has been set or not.
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@ -56,12 +62,17 @@ func (r *ContinuousRange) SetDomain(domain int) {
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// String returns a simple string for the ContinuousRange.
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// String returns a simple string for the ContinuousRange.
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func (r ContinuousRange) String() string {
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func (r ContinuousRange) String() string {
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return fmt.Sprintf("ContinuousRange [%.2f,%.2f] => %f", r.Min, r.Max, r.Domain)
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return fmt.Sprintf("ContinuousRange [%.2f,%.2f] => %d", r.Min, r.Max, r.Domain)
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}
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}
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// Translate maps a given value into the ContinuousRange space.
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// Translate maps a given value into the ContinuousRange space.
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func (r ContinuousRange) Translate(value float64) int {
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func (r ContinuousRange) Translate(value float64) int {
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normalized := value - r.Min
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normalized := value - r.Min
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ratio := normalized / r.GetDelta()
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ratio := normalized / r.GetDelta()
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if r.IsDescending() {
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return r.Domain - int(math.Ceil(ratio*float64(r.Domain)))
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}
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return int(math.Ceil(ratio * float64(r.Domain)))
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return int(math.Ceil(ratio * float64(r.Domain)))
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}
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}
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@ -18,7 +18,13 @@ type MarketHoursRange struct {
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ValueFormatter ValueFormatter
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ValueFormatter ValueFormatter
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Domain int
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Descending bool
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Domain int
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}
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// IsDescending returns if the range is descending.
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func (mhr MarketHoursRange) IsDescending() bool {
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return mhr.Descending
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}
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}
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// GetTimezone returns the timezone for the market hours range.
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// GetTimezone returns the timezone for the market hours range.
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2
range.go
2
range.go
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@ -36,6 +36,8 @@ type Range interface {
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GetDomain() int
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GetDomain() int
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SetDomain(domain int)
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SetDomain(domain int)
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IsDescending() bool
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// Translate the range to the domain.
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// Translate the range to the domain.
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Translate(value float64) int
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Translate(value float64) int
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}
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}
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52
tick.go
52
tick.go
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@ -1,6 +1,10 @@
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package chart
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package chart
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import "math"
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import (
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"fmt"
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"math"
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"strings"
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)
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// TicksProvider is a type that provides ticks.
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// TicksProvider is a type that provides ticks.
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type TicksProvider interface {
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type TicksProvider interface {
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@ -31,6 +35,15 @@ func (t Ticks) Less(i, j int) bool {
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return t[i].Value < t[j].Value
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return t[i].Value < t[j].Value
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}
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}
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// String returns a string representation of the set of ticks.
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func (t Ticks) String() string {
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var values []string
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for i, tick := range t {
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values = append(values, fmt.Sprintf("[%d: %s]", i, tick.Label))
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}
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return strings.Join(values, ", ")
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}
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// GenerateContinuousTicks generates a set of ticks.
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// GenerateContinuousTicks generates a set of ticks.
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func GenerateContinuousTicks(r Renderer, ra Range, isVertical bool, style Style, vf ValueFormatter) []Tick {
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func GenerateContinuousTicks(r Renderer, ra Range, isVertical bool, style Style, vf ValueFormatter) []Tick {
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if vf == nil {
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if vf == nil {
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@ -40,10 +53,17 @@ func GenerateContinuousTicks(r Renderer, ra Range, isVertical bool, style Style,
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var ticks []Tick
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var ticks []Tick
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min, max := ra.GetMin(), ra.GetMax()
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min, max := ra.GetMin(), ra.GetMax()
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ticks = append(ticks, Tick{
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if ra.IsDescending() {
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Value: min,
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ticks = append(ticks, Tick{
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Label: vf(min),
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Value: max,
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})
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Label: vf(max),
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})
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} else {
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ticks = append(ticks, Tick{
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Value: min,
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Label: vf(min),
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})
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}
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minLabel := vf(min)
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minLabel := vf(min)
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style.GetTextOptions().WriteToRenderer(r)
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style.GetTextOptions().WriteToRenderer(r)
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intermediateTickCount = Math.MinInt(intermediateTickCount, 1<<10)
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intermediateTickCount = Math.MinInt(intermediateTickCount, 1<<10)
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for x := 1; x < intermediateTickCount; x++ {
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for x := 1; x < intermediateTickCount; x++ {
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tickValue := min + Math.RoundUp(tickStep*float64(x), roundTo)
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var tickValue float64
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if ra.IsDescending() {
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tickValue = max - Math.RoundUp(tickStep*float64(x), roundTo)
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} else {
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tickValue = min + Math.RoundUp(tickStep*float64(x), roundTo)
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}
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ticks = append(ticks, Tick{
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ticks = append(ticks, Tick{
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Value: tickValue,
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Value: tickValue,
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Label: vf(tickValue),
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Label: vf(tickValue),
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})
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})
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}
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}
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ticks = append(ticks, Tick{
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if ra.IsDescending() {
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Value: max,
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ticks = append(ticks, Tick{
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Label: vf(max),
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Value: min,
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})
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Label: vf(min),
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})
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} else {
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ticks = append(ticks, Tick{
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Value: max,
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Label: vf(max),
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})
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}
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return ticks
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return ticks
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}
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}
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r.SetFont(f)
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r.SetFont(f)
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ra := &ContinuousRange{
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ra := &ContinuousRange{
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Min: 10.0,
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Min: 0.0,
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Max: 0.0,
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Max: 10.0,
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Domain: 256,
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Domain: 256,
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Descending: true,
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}
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}
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vf := FloatValueFormatter
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vf := FloatValueFormatter
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assert.NotEmpty(ticks)
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assert.NotEmpty(ticks)
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assert.Len(ticks, 11)
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assert.Len(ticks, 11)
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assert.Equal(10.0, ticks[0].Value)
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assert.Equal(10.0, ticks[0].Value)
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assert.Equal(9.0, ticks[1].Value)
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assert.Equal(1.0, ticks[len(ticks)-2].Value)
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assert.Equal(0.0, ticks[len(ticks)-1].Value)
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assert.Equal(0.0, ticks[len(ticks)-1].Value)
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}
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}
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