Merge pull request #13 from wcharczuk/text-rotation

Adds `TextRotationDegrees`
This commit is contained in:
Will Charczuk 2016-10-21 12:53:01 -07:00 committed by GitHub
commit 27a5efdd2d
23 changed files with 546 additions and 114 deletions

18
.vscode/launch.json vendored Normal file
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@ -0,0 +1,18 @@
{
"version": "0.2.0",
"configurations": [
{
"name": "Launch",
"type": "go",
"request": "launch",
"mode": "test",
"remotePath": "",
"port": 2345,
"host": "127.0.0.1",
"program": "${workspaceRoot}",
"env": {},
"args": [],
"showLog": true
}
]
}

View file

@ -2,23 +2,33 @@ package main
import (
"net/http"
"strconv"
"strings"
"time"
util "github.com/blendlabs/go-util"
"github.com/wcharczuk/go-chart"
)
func parseInt(str string) int {
v, _ := strconv.Atoi(str)
return v
}
func parseFloat64(str string) float64 {
v, _ := strconv.ParseFloat(str, 64)
return v
}
func readData() ([]time.Time, []float64) {
var xvalues []time.Time
var yvalues []float64
util.ReadFileByLines("requests.csv", func(line string) {
chart.File.ReadByLines("requests.csv", func(line string) {
parts := strings.Split(line, ",")
year := util.ParseInt(parts[0])
month := util.ParseInt(parts[1])
day := util.ParseInt(parts[2])
hour := util.ParseInt(parts[3])
elapsedMillis := util.ParseFloat64(parts[4])
year := parseInt(parts[0])
month := parseInt(parts[1])
day := parseInt(parts[2])
hour := parseInt(parts[3])
elapsedMillis := parseFloat64(parts[4])
xvalues = append(xvalues, time.Date(year, time.Month(month), day, hour, 0, 0, 0, time.UTC))
yvalues = append(yvalues, elapsedMillis)
})
@ -27,12 +37,12 @@ func readData() ([]time.Time, []float64) {
func releases() []chart.GridLine {
return []chart.GridLine{
{Value: chart.TimeToFloat64(time.Date(2016, 8, 1, 9, 30, 0, 0, time.UTC))},
{Value: chart.TimeToFloat64(time.Date(2016, 8, 2, 9, 30, 0, 0, time.UTC))},
{Value: chart.TimeToFloat64(time.Date(2016, 8, 3, 9, 30, 0, 0, time.UTC))},
{Value: chart.TimeToFloat64(time.Date(2016, 8, 4, 9, 30, 0, 0, time.UTC))},
{Value: chart.TimeToFloat64(time.Date(2016, 8, 5, 9, 30, 0, 0, time.UTC))},
{Value: chart.TimeToFloat64(time.Date(2016, 8, 6, 9, 30, 0, 0, time.UTC))},
{Value: chart.Time.ToFloat64(time.Date(2016, 8, 1, 9, 30, 0, 0, time.UTC))},
{Value: chart.Time.ToFloat64(time.Date(2016, 8, 2, 9, 30, 0, 0, time.UTC))},
{Value: chart.Time.ToFloat64(time.Date(2016, 8, 3, 9, 30, 0, 0, time.UTC))},
{Value: chart.Time.ToFloat64(time.Date(2016, 8, 4, 9, 30, 0, 0, time.UTC))},
{Value: chart.Time.ToFloat64(time.Date(2016, 8, 5, 9, 30, 0, 0, time.UTC))},
{Value: chart.Time.ToFloat64(time.Date(2016, 8, 6, 9, 30, 0, 0, time.UTC))},
}
}
@ -81,9 +91,14 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
Name: "Elapsed Millis",
NameStyle: chart.StyleShow(),
Style: chart.StyleShow(),
TickStyle: chart.Style{
TextRotationDegrees: 45.0,
},
},
XAxis: chart.XAxis{
Style: chart.StyleShow(),
Style: chart.Style{
Show: true,
},
ValueFormatter: chart.TimeHourValueFormatter,
GridMajorStyle: chart.Style{
Show: true,

View file

@ -60,8 +60,8 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
},
}
res.Header().Set("Content-Type", "image/svg+xml")
graph.Render(chart.SVG, res)
res.Header().Set("Content-Type", "image/png")
graph.Render(chart.PNG, res)
}
func xvalues() []time.Time {

View file

@ -0,0 +1,53 @@
package main
import (
"net/http"
"github.com/wcharczuk/go-chart"
"github.com/wcharczuk/go-chart/drawing"
)
func drawChart(res http.ResponseWriter, req *http.Request) {
f, _ := chart.GetDefaultFont()
r, _ := chart.PNG(1024, 1024)
chart.Draw.Text(r, "Test", 64, 64, chart.Style{
FontColor: drawing.ColorBlack,
FontSize: 18,
Font: f,
})
chart.Draw.Text(r, "Test", 64, 64, chart.Style{
FontColor: drawing.ColorBlack,
FontSize: 18,
Font: f,
TextRotationDegrees: 45.0,
})
tb := chart.Draw.MeasureText(r, "Test", chart.Style{
FontColor: drawing.ColorBlack,
FontSize: 18,
Font: f,
}).Shift(64, 64)
tbc := tb.Corners().Rotate(45)
chart.Draw.BoxCorners(r, tbc, chart.Style{
StrokeColor: drawing.ColorRed,
StrokeWidth: 2,
})
tbcb := tbc.Box()
chart.Draw.Box(r, tbcb, chart.Style{
StrokeColor: drawing.ColorBlue,
StrokeWidth: 2,
})
res.Header().Set("Content-Type", "image/png")
r.Save(res)
}
func main() {
http.HandleFunc("/", drawChart)
http.ListenAndServe(":8080", nil)
}

115
box.go
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@ -1,6 +1,9 @@
package chart
import "fmt"
import (
"fmt"
"math"
)
// Box represents the main 4 dimensions of a box.
type Box struct {
@ -76,8 +79,8 @@ func (b Box) Height() int {
// Center returns the center of the box
func (b Box) Center() (x, y int) {
w, h := b.Width(), b.Height()
return b.Left + w>>1, b.Top + h>>1
w2, h2 := b.Width()>>1, b.Height()>>1
return b.Left + w2, b.Top + h2
}
// Aspect returns the aspect ratio of the box.
@ -139,6 +142,16 @@ func (b Box) Shift(x, y int) Box {
}
}
// Corners returns the box as a set of corners.
func (b Box) Corners() BoxCorners {
return BoxCorners{
TopLeft: Point{b.Left, b.Top},
TopRight: Point{b.Right, b.Top},
BottomRight: Point{b.Right, b.Bottom},
BottomLeft: Point{b.Left, b.Bottom},
}
}
// Fit is functionally the inverse of grow.
// Fit maintains the original aspect ratio of the `other` box,
// but constrains it to the bounds of the target box.
@ -219,3 +232,99 @@ func (b Box) OuterConstrain(bounds, other Box) Box {
}
return newBox
}
// BoxCorners is a box with independent corners.
type BoxCorners struct {
TopLeft, TopRight, BottomRight, BottomLeft Point
}
// Box return the BoxCorners as a regular box.
func (bc BoxCorners) Box() Box {
return Box{
Top: Math.MinInt(bc.TopLeft.Y, bc.TopRight.Y),
Left: Math.MinInt(bc.TopLeft.X, bc.BottomLeft.X),
Right: Math.MaxInt(bc.TopRight.X, bc.BottomRight.X),
Bottom: Math.MaxInt(bc.BottomLeft.Y, bc.BottomRight.Y),
}
}
// Width returns the width
func (bc BoxCorners) Width() int {
minLeft := Math.MinInt(bc.TopLeft.X, bc.BottomLeft.X)
maxRight := Math.MaxInt(bc.TopRight.X, bc.BottomRight.X)
return maxRight - minLeft
}
// Height returns the height
func (bc BoxCorners) Height() int {
minTop := Math.MinInt(bc.TopLeft.Y, bc.TopRight.Y)
maxBottom := Math.MaxInt(bc.BottomLeft.Y, bc.BottomRight.Y)
return maxBottom - minTop
}
// Center returns the center of the box
func (bc BoxCorners) Center() (x, y int) {
left := Math.MeanInt(bc.TopLeft.X, bc.BottomLeft.X)
right := Math.MeanInt(bc.TopRight.X, bc.BottomRight.X)
x = ((right - left) >> 1) + left
top := Math.MeanInt(bc.TopLeft.Y, bc.TopRight.Y)
bottom := Math.MeanInt(bc.BottomLeft.Y, bc.BottomRight.Y)
y = ((bottom - top) >> 1) + top
return
}
// Rotate rotates the box.
func (bc BoxCorners) Rotate(thetaDegrees float64) BoxCorners {
cx, cy := bc.Center()
thetaRadians := Math.DegreesToRadians(thetaDegrees)
tlx, tly := Math.RotateCoordinate(cx, cy, bc.TopLeft.X, bc.TopLeft.Y, thetaRadians)
trx, try := Math.RotateCoordinate(cx, cy, bc.TopRight.X, bc.TopRight.Y, thetaRadians)
brx, bry := Math.RotateCoordinate(cx, cy, bc.BottomRight.X, bc.BottomRight.Y, thetaRadians)
blx, bly := Math.RotateCoordinate(cx, cy, bc.BottomLeft.X, bc.BottomLeft.Y, thetaRadians)
return BoxCorners{
TopLeft: Point{tlx, tly},
TopRight: Point{trx, try},
BottomRight: Point{brx, bry},
BottomLeft: Point{blx, bly},
}
}
// Equals returns if the box equals another box.
func (bc BoxCorners) Equals(other BoxCorners) bool {
return bc.TopLeft.Equals(other.TopLeft) &&
bc.TopRight.Equals(other.TopRight) &&
bc.BottomRight.Equals(other.BottomRight) &&
bc.BottomLeft.Equals(other.BottomLeft)
}
func (bc BoxCorners) String() string {
return fmt.Sprintf("BoxC{%s,%s,%s,%s}", bc.TopLeft.String(), bc.TopRight.String(), bc.BottomRight.String(), bc.BottomLeft.String())
}
// Point is an X,Y pair
type Point struct {
X, Y int
}
// DistanceTo calculates the distance to another point.
func (p Point) DistanceTo(other Point) float64 {
dx := math.Pow(float64(p.X-other.X), 2)
dy := math.Pow(float64(p.Y-other.Y), 2)
return math.Pow(dx+dy, 0.5)
}
// Equals returns if a point equals another point.
func (p Point) Equals(other Point) bool {
return p.X == other.X && p.Y == other.Y
}
// String returns a string representation of the point.
func (p Point) String() string {
return fmt.Sprintf("P{%d,%d}", p.X, p.Y)
}

View file

@ -143,3 +143,46 @@ func TestBoxShift(t *testing.T) {
assert.Equal(11, shifted.Right)
assert.Equal(12, shifted.Bottom)
}
func TestBoxCenter(t *testing.T) {
assert := assert.New(t)
b := Box{
Top: 10,
Left: 10,
Right: 20,
Bottom: 30,
}
cx, cy := b.Center()
assert.Equal(15, cx)
assert.Equal(20, cy)
}
func TestBoxCornersCenter(t *testing.T) {
assert := assert.New(t)
bc := BoxCorners{
TopLeft: Point{5, 5},
TopRight: Point{15, 5},
BottomRight: Point{15, 15},
BottomLeft: Point{5, 15},
}
cx, cy := bc.Center()
assert.Equal(10, cx)
assert.Equal(10, cy)
}
func TestBoxCornersRotate(t *testing.T) {
assert := assert.New(t)
bc := BoxCorners{
TopLeft: Point{5, 5},
TopRight: Point{15, 5},
BottomRight: Point{15, 15},
BottomLeft: Point{5, 15},
}
rotated := bc.Rotate(45)
assert.True(rotated.TopLeft.Equals(Point{10, 3}), rotated.String())
}

View file

@ -102,12 +102,12 @@ func (c Chart) Render(rp RendererProvider, w io.Writer) error {
if c.hasAxes() {
xt, yt, yta = c.getAxesTicks(r, xr, yr, yra, xf, yf, yfa)
canvasBox = c.getAxisAdjustedCanvasBox(r, canvasBox, xr, yr, yra, xt, yt, yta)
canvasBox = c.getAxesAdjustedCanvasBox(r, canvasBox, xr, yr, yra, xt, yt, yta)
xr, yr, yra = c.setRangeDomains(canvasBox, xr, yr, yra)
// do a second pass in case things haven't settled yet.
xt, yt, yta = c.getAxesTicks(r, xr, yr, yra, xf, yf, yfa)
canvasBox = c.getAxisAdjustedCanvasBox(r, canvasBox, xr, yr, yra, xt, yt, yta)
canvasBox = c.getAxesAdjustedCanvasBox(r, canvasBox, xr, yr, yra, xt, yt, yta)
xr, yr, yra = c.setRangeDomains(canvasBox, xr, yr, yra)
}
@ -320,7 +320,7 @@ func (c Chart) getAxesTicks(r Renderer, xr, yr, yar Range, xf, yf, yfa ValueForm
return
}
func (c Chart) getAxisAdjustedCanvasBox(r Renderer, canvasBox Box, xr, yr, yra Range, xticks, yticks, yticksAlt []Tick) Box {
func (c Chart) getAxesAdjustedCanvasBox(r Renderer, canvasBox Box, xr, yr, yra Range, xticks, yticks, yticksAlt []Tick) Box {
axesOuterBox := canvasBox.Clone()
if c.XAxis.Style.Show {
axesBounds := c.XAxis.Measure(r, canvasBox, xr, c.styleDefaultsAxes(), xticks)

42
draw.go
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@ -140,6 +140,7 @@ func (d draw) HistogramSeries(r Renderer, canvasBox Box, xrange, yrange Range, s
// MeasureAnnotation measures how big an annotation would be.
func (d draw) MeasureAnnotation(r Renderer, canvasBox Box, style Style, lx, ly int, label string) Box {
style.WriteToRenderer(r)
defer r.ResetStyle()
textBox := r.MeasureText(label)
textWidth := textBox.Width()
@ -168,6 +169,8 @@ func (d draw) MeasureAnnotation(r Renderer, canvasBox Box, style Style, lx, ly i
// Annotation draws an anotation with a renderer.
func (d draw) Annotation(r Renderer, canvasBox Box, style Style, lx, ly int, label string) {
style.GetTextOptions().WriteToRenderer(r)
defer r.ResetStyle()
textBox := r.MeasureText(label)
textWidth := textBox.Width()
halfTextHeight := textBox.Height() >> 1
@ -209,7 +212,8 @@ func (d draw) Annotation(r Renderer, canvasBox Box, style Style, lx, ly int, lab
// Box draws a box with a given style.
func (d draw) Box(r Renderer, b Box, s Style) {
s.WriteToRenderer(r)
s.GetFillAndStrokeOptions().WriteToRenderer(r)
defer r.ResetStyle()
r.MoveTo(b.Left, b.Top)
r.LineTo(b.Right, b.Top)
@ -219,19 +223,45 @@ func (d draw) Box(r Renderer, b Box, s Style) {
r.FillStroke()
}
func (d draw) BoxRotated(r Renderer, b Box, thetaDegrees float64, s Style) {
d.BoxCorners(r, b.Corners().Rotate(thetaDegrees), s)
}
func (d draw) BoxCorners(r Renderer, bc BoxCorners, s Style) {
s.GetFillAndStrokeOptions().WriteToRenderer(r)
defer r.ResetStyle()
r.MoveTo(bc.TopLeft.X, bc.TopLeft.Y)
r.LineTo(bc.TopRight.X, bc.TopRight.Y)
r.LineTo(bc.BottomRight.X, bc.BottomRight.Y)
r.LineTo(bc.BottomLeft.X, bc.BottomLeft.Y)
r.Close()
r.FillStroke()
}
// DrawText draws text with a given style.
func (d draw) Text(r Renderer, text string, x, y int, style Style) {
style.GetTextOptions().WriteToRenderer(r)
defer r.ResetStyle()
r.Text(text, x, y)
}
func (d draw) MeasureText(r Renderer, text string, style Style) Box {
style.GetTextOptions().WriteToRenderer(r)
defer r.ResetStyle()
return r.MeasureText(text)
}
// TextWithin draws the text within a given box.
func (d draw) TextWithin(r Renderer, text string, box Box, style Style) {
style.GetTextOptions().WriteToRenderer(r)
defer r.ResetStyle()
lines := Text.WrapFit(r, text, box.Width(), style)
linesBox := Text.MeasureLines(r, lines, style)
style.GetTextOptions().WriteToRenderer(r)
y := box.Top
switch style.GetTextVerticalAlign() {
@ -252,7 +282,11 @@ func (d draw) TextWithin(r Renderer, text string, box Box, style Style) {
default:
tx = box.Left
}
ty = y + lineBox.Height()
if style.TextRotationDegrees == 0 {
ty = y + lineBox.Height()
} else {
ty = y
}
d.Text(r, line, tx, ty, style)
y += lineBox.Height() + style.GetTextLineSpacing()

52
file_util.go Normal file
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@ -0,0 +1,52 @@
package chart
import (
"bufio"
"io"
"os"
exception "github.com/blendlabs/go-exception"
)
var (
// File contains file utility functions
File = fileUtil{}
)
type fileUtil struct{}
// ReadByLines reads a file and calls the handler for each line.
func (fu fileUtil) ReadByLines(filePath string, handler func(line string)) error {
if f, err := os.Open(filePath); err == nil {
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
handler(line)
}
} else {
return exception.Wrap(err)
}
return nil
}
// ReadByChunks reads a file in `chunkSize` pieces, dispatched to the handler.
func (fu fileUtil) ReadByChunks(filePath string, chunkSize int, handler func(line []byte)) error {
if f, err := os.Open(filePath); err == nil {
defer f.Close()
chunk := make([]byte, chunkSize)
for {
readBytes, err := f.Read(chunk)
if err == io.EOF {
break
}
readData := chunk[:readBytes]
handler(readData)
}
} else {
return exception.Wrap(err)
}
return nil
}

View file

@ -54,9 +54,7 @@ func Legend(c *Chart, userDefaults ...Style) Renderable {
Bottom: legend.Top + legendPadding.Top,
}
r.SetFont(legendStyle.GetFont())
r.SetFontColor(legendStyle.GetFontColor())
r.SetFontSize(legendStyle.GetFontSize())
legendStyle.GetTextOptions().WriteToRenderer(r)
// measure
labelCount := 0
@ -79,6 +77,8 @@ func Legend(c *Chart, userDefaults ...Style) Renderable {
Draw.Box(r, legend, legendStyle)
legendStyle.GetTextOptions().WriteToRenderer(r)
ycursor := legendContent.Top
tx := legendContent.Left
legendCount := 0

View file

@ -33,12 +33,12 @@ func (mhr MarketHoursRange) IsZero() bool {
// GetMin returns the min value.
func (mhr MarketHoursRange) GetMin() float64 {
return TimeToFloat64(mhr.Min)
return Time.ToFloat64(mhr.Min)
}
// GetMax returns the max value.
func (mhr MarketHoursRange) GetMax() float64 {
return TimeToFloat64(mhr.GetEffectiveMax())
return Time.ToFloat64(mhr.GetEffectiveMax())
}
// GetEffectiveMax gets either the close on the max, or the max itself.
@ -52,13 +52,13 @@ func (mhr MarketHoursRange) GetEffectiveMax() time.Time {
// SetMin sets the min value.
func (mhr *MarketHoursRange) SetMin(min float64) {
mhr.Min = Float64ToTime(min)
mhr.Min = Time.FromFloat64(min)
mhr.Min = mhr.Min.In(mhr.GetTimezone())
}
// SetMax sets the max value.
func (mhr *MarketHoursRange) SetMax(max float64) {
mhr.Max = Float64ToTime(max)
mhr.Max = Time.FromFloat64(max)
mhr.Max = mhr.Max.In(mhr.GetTimezone())
}
@ -159,7 +159,7 @@ func (mhr *MarketHoursRange) makeTicks(vf ValueFormatter, times []time.Time) []T
ticks := make([]Tick, len(times))
for index, t := range times {
ticks[index] = Tick{
Value: TimeToFloat64(t),
Value: Time.ToFloat64(t),
Label: vf(t),
}
}
@ -172,7 +172,7 @@ func (mhr MarketHoursRange) String() string {
// Translate maps a given value into the ContinuousRange space.
func (mhr MarketHoursRange) Translate(value float64) int {
valueTime := Float64ToTime(value)
valueTime := Time.FromFloat64(value)
valueTimeEastern := valueTime.In(Date.Eastern())
totalSeconds := Date.CalculateMarketSecondsBetween(mhr.Min, mhr.GetEffectiveMax(), mhr.GetMarketOpen(), mhr.GetMarketClose(), mhr.HolidayProvider)
valueDelta := Date.CalculateMarketSecondsBetween(mhr.Min, valueTimeEastern, mhr.GetMarketOpen(), mhr.GetMarketClose(), mhr.HolidayProvider)

View file

@ -35,9 +35,9 @@ func TestMarketHoursRangeTranslate(t *testing.T) {
weds := time.Date(2016, 07, 20, 9, 30, 0, 0, Date.Eastern())
assert.Equal(0, r.Translate(TimeToFloat64(r.Min)))
assert.Equal(400, r.Translate(TimeToFloat64(weds)))
assert.Equal(1000, r.Translate(TimeToFloat64(r.Max)))
assert.Equal(0, r.Translate(Time.ToFloat64(r.Min)))
assert.Equal(400, r.Translate(Time.ToFloat64(weds)))
assert.Equal(1000, r.Translate(Time.ToFloat64(r.Max)))
}
func TestMarketHoursRangeGetTicks(t *testing.T) {
@ -67,6 +67,6 @@ func TestMarketHoursRangeGetTicks(t *testing.T) {
ticks := ra.GetTicks(r, defaults, TimeValueFormatter)
assert.NotEmpty(ticks)
assert.Len(ticks, 5)
assert.NotEqual(TimeToFloat64(ra.Min), ticks[0].Value)
assert.NotEqual(Time.ToFloat64(ra.Min), ticks[0].Value)
assert.NotEmpty(ticks[0].Label)
}

View file

@ -19,16 +19,6 @@ const (
_r2d = (180.0 / math.Pi)
)
// TimeToFloat64 returns a float64 representation of a time.
func TimeToFloat64(t time.Time) float64 {
return float64(t.UnixNano())
}
// Float64ToTime returns a time from a float64.
func Float64ToTime(tf float64) time.Time {
return time.Unix(0, int64(tf))
}
var (
// Math contains helper methods for common math operations.
Math = &mathUtil{}
@ -144,6 +134,16 @@ func (m mathUtil) AbsInt(value int) int {
return value
}
// Mean returns the mean of a set of values
func (m mathUtil) Mean(values ...float64) float64 {
return m.Sum(values...) / float64(len(values))
}
// MeanInt returns the mean of a set of integer values.
func (m mathUtil) MeanInt(values ...int) int {
return m.SumInt(values...) / len(values)
}
// Sum sums a set of values.
func (m mathUtil) Sum(values ...float64) float64 {
var total float64
@ -214,9 +214,18 @@ func (m mathUtil) DegreesToCompass(deg float64) float64 {
}
// CirclePoint returns the absolute position of a circle diameter point given
// by the radius and the angle.
func (m mathUtil) CirclePoint(cx, cy int, radius, angleRadians float64) (x, y int) {
x = cx + int(radius*math.Sin(angleRadians))
y = cy - int(radius*math.Cos(angleRadians))
// by the radius and the theta.
func (m mathUtil) CirclePoint(cx, cy int, radius, thetaRadians float64) (x, y int) {
x = cx + int(radius*math.Sin(thetaRadians))
y = cy - int(radius*math.Cos(thetaRadians))
return
}
func (m mathUtil) RotateCoordinate(cx, cy, x, y int, thetaRadians float64) (rx, ry int) {
tempX, tempY := float64(x-cx), float64(y-cy)
rotatedX := tempX*math.Cos(thetaRadians) - tempY*math.Sin(thetaRadians)
rotatedY := tempX*math.Sin(thetaRadians) + tempY*math.Cos(thetaRadians)
rx = int(rotatedX) + cx
ry = int(rotatedY) + cy
return
}

View file

@ -160,3 +160,25 @@ func TestRadianAdd(t *testing.T) {
assert.Equal(_pi, Math.RadianAdd(_pi, _2pi))
assert.Equal(_pi, Math.RadianAdd(_pi, -_2pi))
}
func TestRotateCoordinate90(t *testing.T) {
assert := assert.New(t)
cx, cy := 10, 10
x, y := 5, 10
rx, ry := Math.RotateCoordinate(cx, cy, x, y, Math.DegreesToRadians(90))
assert.Equal(10, rx)
assert.Equal(5, ry)
}
func TestRotateCoordinate45(t *testing.T) {
assert := assert.New(t)
cx, cy := 10, 10
x, y := 5, 10
rx, ry := Math.RotateCoordinate(cx, cy, x, y, Math.DegreesToRadians(45))
assert.Equal(7, rx)
assert.Equal(7, ry)
}

View file

@ -28,11 +28,16 @@ type rasterRenderer struct {
i *image.RGBA
gc *drawing.RasterGraphicContext
rotateRadians float64
rotateRadians *float64
s Style
}
func (rr *rasterRenderer) ResetStyle() {
rr.s = Style{Font: rr.s.Font}
rr.ClearTextRotation()
}
// GetDPI returns the dpi.
func (rr *rasterRenderer) GetDPI() float64 {
return rr.gc.GetDPI()
@ -177,35 +182,40 @@ func (rr *rasterRenderer) MeasureText(body string) Box {
t = 0
}
return Box{
textBox := Box{
Top: int(math.Ceil(t)),
Left: int(math.Ceil(l)),
Right: int(math.Ceil(r)),
Bottom: int(math.Ceil(b)),
}
if rr.rotateRadians == nil {
return textBox
}
return textBox.Corners().Rotate(Math.RadiansToDegrees(*rr.rotateRadians)).Box()
}
// SetTextRotation sets a text rotation.
func (rr *rasterRenderer) SetTextRotation(radians float64) {
rr.rotateRadians = radians
rr.rotateRadians = &radians
}
func (rr *rasterRenderer) getCoords(x, y int) (xf, yf int) {
if rr.rotateRadians == 0 {
if rr.rotateRadians == nil {
xf = x
yf = y
return
}
rr.gc.Translate(float64(x), float64(y))
rr.gc.Rotate(rr.rotateRadians)
rr.gc.Rotate(*rr.rotateRadians)
return
}
// ClearTextRotation clears text rotation.
func (rr *rasterRenderer) ClearTextRotation() {
rr.gc.SetMatrixTransform(drawing.NewIdentityMatrix())
rr.rotateRadians = 0
rr.rotateRadians = nil
}
// Save implements the interface method.

View file

@ -9,6 +9,9 @@ import (
// Renderer represents the basic methods required to draw a chart.
type Renderer interface {
// ResetStyle should reset any style related settings on the renderer.
ResetStyle()
// GetDPI gets the DPI for the renderer.
GetDPI() float64

View file

@ -33,6 +33,7 @@ type Style struct {
TextVerticalAlign TextVerticalAlign
TextWrap TextWrap
TextLineSpacing int
TextRotationDegrees float64 //0 is unset or normal
}
// IsZero returns if the object is set or not.
@ -241,6 +242,16 @@ func (s Style) GetTextLineSpacing(defaults ...int) int {
return s.TextLineSpacing
}
// GetTextRotationDegrees returns the text rotation in degrees.
func (s Style) GetTextRotationDegrees(defaults ...float64) float64 {
if s.TextRotationDegrees == 0 {
if len(defaults) > 0 {
return defaults[0]
}
}
return s.TextRotationDegrees
}
// WriteToRenderer passes the style's options to a renderer.
func (s Style) WriteToRenderer(r Renderer) {
r.SetStrokeColor(s.GetStrokeColor())
@ -250,6 +261,11 @@ func (s Style) WriteToRenderer(r Renderer) {
r.SetFont(s.GetFont())
r.SetFontColor(s.GetFontColor())
r.SetFontSize(s.GetFontSize())
r.ClearTextRotation()
if s.GetTextRotationDegrees() != 0 {
r.SetTextRotation(Math.DegreesToRadians(s.GetTextRotationDegrees()))
}
}
// WriteDrawingOptionsToRenderer passes just the drawing style options to a renderer.
@ -281,6 +297,7 @@ func (s Style) InheritFrom(defaults Style) (final Style) {
final.TextVerticalAlign = s.GetTextVerticalAlign(defaults.TextVerticalAlign)
final.TextWrap = s.GetTextWrap(defaults.TextWrap)
final.TextLineSpacing = s.GetTextLineSpacing(defaults.TextLineSpacing)
final.TextRotationDegrees = s.GetTextRotationDegrees(defaults.TextRotationDegrees)
return
}
@ -320,5 +337,6 @@ func (s Style) GetTextOptions() Style {
TextVerticalAlign: s.TextVerticalAlign,
TextWrap: s.TextWrap,
TextLineSpacing: s.TextLineSpacing,
TextRotationDegrees: s.TextRotationDegrees,
}
}

View file

@ -30,14 +30,14 @@ func (ts TimeSeries) Len() int {
// GetValue gets a value at a given index.
func (ts TimeSeries) GetValue(index int) (x, y float64) {
x = TimeToFloat64(ts.XValues[index])
x = Time.ToFloat64(ts.XValues[index])
y = ts.YValues[index]
return
}
// GetLastValue gets the last value.
func (ts TimeSeries) GetLastValue() (x, y float64) {
x = TimeToFloat64(ts.XValues[len(ts.XValues)-1])
x = Time.ToFloat64(ts.XValues[len(ts.XValues)-1])
y = ts.YValues[len(ts.YValues)-1]
return
}

20
time_util.go Normal file
View file

@ -0,0 +1,20 @@
package chart
import "time"
var (
// Time contains time utility functions.
Time = timeUtil{}
)
type timeUtil struct{}
// TimeToFloat64 returns a float64 representation of a time.
func (tu timeUtil) ToFloat64(t time.Time) float64 {
return float64(t.UnixNano())
}
// Float64ToTime returns a time from a float64.
func (tu timeUtil) FromFloat64(tf float64) time.Time {
return time.Unix(0, int64(tf))
}

View file

@ -11,7 +11,7 @@ func TestTimeValueFormatterWithFormat(t *testing.T) {
assert := assert.New(t)
d := time.Now()
di := TimeToFloat64(d)
di := Time.ToFloat64(d)
df := float64(di)
s := TimeValueFormatterWithFormat(d, DefaultDateFormat)

View file

@ -32,11 +32,15 @@ type vectorRenderer struct {
b *bytes.Buffer
c *canvas
s *Style
r float64
p []string
fc *font.Drawer
}
func (vr *vectorRenderer) ResetStyle() {
vr.s = &Style{Font: vr.s.Font}
vr.fc = nil
}
// GetDPI returns the dpi.
func (vr *vectorRenderer) GetDPI() float64 {
return vr.dpi
@ -168,18 +172,22 @@ func (vr *vectorRenderer) MeasureText(body string) (box Box) {
box.Right = w
box.Bottom = int(drawing.PointsToPixels(vr.dpi, vr.s.FontSize))
if vr.c.textTheta == nil {
return
}
box = box.Corners().Rotate(Math.RadiansToDegrees(*vr.c.textTheta)).Box()
}
return
}
// SetTextRotation sets the text rotation.
func (vr *vectorRenderer) SetTextRotation(radians float64) {
vr.c.r = radians
vr.c.textTheta = &radians
}
// ClearTextRotation clears the text rotation.
func (vr *vectorRenderer) ClearTextRotation() {
vr.c.r = 0
vr.c.textTheta = nil
}
// Save saves the renderer's contents to a writer.
@ -196,11 +204,11 @@ func newCanvas(w io.Writer) *canvas {
}
type canvas struct {
w io.Writer
dpi float64
r float64
width int
height int
w io.Writer
dpi float64
textTheta *float64
width int
height int
}
func (c *canvas) Start(width, height int) {
@ -218,10 +226,10 @@ func (c *canvas) Path(d string, style Style) {
}
func (c *canvas) Text(x, y int, body string, style Style) {
if c.r == 0 {
if c.textTheta == nil {
c.w.Write([]byte(fmt.Sprintf(`<text x="%d" y="%d" style="%s">%s</text>`, x, y, c.styleAsSVG(style), body)))
} else {
transform := fmt.Sprintf(` transform="rotate(%0.2f,%d,%d)"`, Math.RadiansToDegrees(c.r), x, y)
transform := fmt.Sprintf(` transform="rotate(%0.2f,%d,%d)"`, Math.RadiansToDegrees(*c.textTheta), x, y)
c.w.Write([]byte(fmt.Sprintf(`<text x="%d" y="%d" style="%s"%s>%s</text>`, x, y, c.styleAsSVG(style), transform, body)))
}
}

View file

@ -7,13 +7,15 @@ import (
// XAxis represents the horizontal axis.
type XAxis struct {
Name string
NameStyle Style
Name string
NameStyle Style
Style Style
ValueFormatter ValueFormatter
Range Range
Ticks []Tick
TickStyle Style
Ticks []Tick
TickPosition TickPosition
GridLines []GridLine
@ -68,20 +70,20 @@ func (xa XAxis) GetGridLines(ticks []Tick) []GridLine {
// Measure returns the bounds of the axis.
func (xa XAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) Box {
tickStyle := xa.Style.InheritFrom(defaults)
tickStyle := xa.TickStyle.InheritFrom(xa.Style.InheritFrom(defaults))
sort.Sort(Ticks(ticks))
tp := xa.GetTickPosition()
var ltx, rtx int
var tx, ty int
var left, right, bottom = math.MaxInt32, 0, 0
for index, t := range ticks {
v := t.Value
tickStyle.GetTextOptions().WriteToRenderer(r)
tb := r.MeasureText(t.Label)
tb := Draw.MeasureText(r, t.Label, tickStyle.GetTextOptions())
var ltx, rtx int
tx := canvasBox.Left + ra.Translate(v)
ty := canvasBox.Bottom + DefaultXAxisMargin + tb.Height()
tx = canvasBox.Left + ra.Translate(v)
ty = canvasBox.Bottom + DefaultXAxisMargin + tb.Height()
switch tp {
case TickPositionUnderTick, TickPositionUnset:
ltx = tx - tb.Width()>>1
@ -101,7 +103,7 @@ func (xa XAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, tic
}
if xa.NameStyle.Show && len(xa.Name) > 0 {
tb := r.MeasureText(xa.Name)
tb := Draw.MeasureText(r, xa.Name, xa.NameStyle.InheritFrom(defaults))
bottom += DefaultXAxisMargin + tb.Height()
}
@ -115,7 +117,7 @@ func (xa XAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, tic
// Render renders the axis
func (xa XAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) {
tickStyle := xa.Style.InheritFrom(defaults)
tickStyle := xa.TickStyle.InheritFrom(xa.Style.InheritFrom(defaults))
tickStyle.GetStrokeOptions().WriteToRenderer(r)
r.MoveTo(canvasBox.Left, canvasBox.Bottom)
@ -139,25 +141,31 @@ func (xa XAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, tick
r.LineTo(tx, canvasBox.Bottom+DefaultVerticalTickHeight)
r.Stroke()
tickStyle.GetTextOptions().WriteToRenderer(r)
tb := r.MeasureText(t.Label)
tickWithAxisStyle := xa.TickStyle.InheritFrom(xa.Style.InheritFrom(defaults))
tb := Draw.MeasureText(r, t.Label, tickWithAxisStyle)
switch tp {
case TickPositionUnderTick, TickPositionUnset:
ty = canvasBox.Bottom + DefaultXAxisMargin + tb.Height()
r.Text(t.Label, tx-tb.Width()>>1, ty)
if tickStyle.TextRotationDegrees == 0 {
tx = tx - tb.Width()>>1
ty = canvasBox.Bottom + DefaultXAxisMargin + tb.Height()
} else {
ty = canvasBox.Bottom + (2 * DefaultXAxisMargin)
}
Draw.Text(r, t.Label, tx, ty, tickWithAxisStyle)
maxTextHeight = Math.MaxInt(maxTextHeight, tb.Height())
break
case TickPositionBetweenTicks:
if index > 0 {
llx := ra.Translate(ticks[index-1].Value)
ltx := canvasBox.Left + llx
finalTickStyle := tickStyle.InheritFrom(Style{TextHorizontalAlign: TextHorizontalAlignCenter})
finalTickStyle := tickWithAxisStyle.InheritFrom(Style{TextHorizontalAlign: TextHorizontalAlignCenter})
Draw.TextWithin(r, t.Label, Box{
Left: ltx,
Right: tx,
Top: canvasBox.Bottom + DefaultXAxisMargin,
Bottom: canvasBox.Bottom + DefaultXAxisMargin + tb.Height(),
Bottom: canvasBox.Bottom + DefaultXAxisMargin,
}, finalTickStyle)
ftb := Text.MeasureLines(r, Text.WrapFit(r, t.Label, tx-ltx, finalTickStyle), finalTickStyle)
@ -169,11 +177,10 @@ func (xa XAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, tick
nameStyle := xa.NameStyle.InheritFrom(defaults)
if xa.NameStyle.Show && len(xa.Name) > 0 {
nameStyle.GetTextOptions().WriteToRenderer(r)
tb := r.MeasureText(xa.Name)
tb := Draw.MeasureText(r, xa.Name, nameStyle)
tx := canvasBox.Right - (canvasBox.Width()>>1 + tb.Width()>>1)
ty := canvasBox.Bottom + DefaultXAxisMargin + maxTextHeight + DefaultXAxisMargin + tb.Height()
r.Text(xa.Name, tx, ty)
Draw.Text(r, xa.Name, tx, ty, nameStyle)
}
if xa.GridMajorStyle.Show || xa.GridMinorStyle.Show {

View file

@ -20,9 +20,10 @@ type YAxis struct {
ValueFormatter ValueFormatter
Range Range
TickStyle Style
Ticks []Tick
GridLines []GridLine
GridLines []GridLine
GridMajorStyle Style
GridMinorStyle Style
}
@ -42,6 +43,11 @@ func (ya YAxis) GetStyle() Style {
return ya.Style
}
// GetTickStyle returns the tick style.
func (ya YAxis) GetTickStyle() Style {
return ya.TickStyle
}
// GetTicks returns the ticks for a series.
// The coalesce priority is:
// - User Supplied Ticks (i.e. Ticks array on the axis itself).
@ -68,8 +74,6 @@ func (ya YAxis) GetGridLines(ticks []Tick) []GridLine {
// Measure returns the bounds of the axis.
func (ya YAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) Box {
ya.Style.InheritFrom(defaults).WriteToRenderer(r)
sort.Sort(Ticks(ticks))
var tx int
@ -79,6 +83,7 @@ func (ya YAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, tic
tx = canvasBox.Left - DefaultYAxisMargin
}
ya.TickStyle.InheritFrom(ya.Style.InheritFrom(defaults)).WriteToRenderer(r)
var minx, maxx, miny, maxy = math.MaxInt32, 0, math.MaxInt32, 0
var maxTextHeight int
for _, t := range ticks {
@ -86,14 +91,13 @@ func (ya YAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, tic
ly := canvasBox.Bottom - ra.Translate(v)
tb := r.MeasureText(t.Label)
tbh2 := tb.Height() >> 1
finalTextX := tx
if ya.AxisType == YAxisSecondary {
finalTextX = tx - tb.Width()
}
if tb.Height() > maxTextHeight {
maxTextHeight = tb.Height()
}
maxTextHeight = Math.MaxInt(tb.Height(), maxTextHeight)
if ya.AxisType == YAxisPrimary {
minx = canvasBox.Right
@ -102,8 +106,9 @@ func (ya YAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, tic
minx = Math.MinInt(minx, finalTextX)
maxx = Math.MaxInt(maxx, tx)
}
miny = Math.MinInt(miny, ly-tb.Height()>>1)
maxy = Math.MaxInt(maxy, ly+tb.Height()>>1)
miny = Math.MinInt(miny, ly-tbh2)
maxy = Math.MaxInt(maxy, ly+tbh2)
}
if ya.NameStyle.Show && len(ya.Name) > 0 {
@ -120,11 +125,12 @@ func (ya YAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, tic
// Render renders the axis.
func (ya YAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) {
ya.Style.InheritFrom(defaults).WriteToRenderer(r)
tickStyle := ya.TickStyle.InheritFrom(ya.Style.InheritFrom(defaults))
tickStyle.WriteToRenderer(r)
sort.Sort(Ticks(ticks))
sw := ya.Style.GetStrokeWidth(defaults.StrokeWidth)
sw := tickStyle.GetStrokeWidth(defaults.StrokeWidth)
var lx int
var tx int
@ -141,23 +147,30 @@ func (ya YAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, tick
r.Stroke()
var maxTextWidth int
var finalTextX, finalTextY int
for _, t := range ticks {
v := t.Value
ly := canvasBox.Bottom - ra.Translate(v)
tb := r.MeasureText(t.Label)
tb := Draw.MeasureText(r, t.Label, tickStyle)
if tb.Width() > maxTextWidth {
maxTextWidth = tb.Width()
}
finalTextX := tx
finalTextY := ly + tb.Height()>>1
if ya.AxisType == YAxisSecondary {
finalTextX = tx - tb.Width()
} else {
finalTextX = tx
}
r.Text(t.Label, finalTextX, finalTextY)
if tickStyle.TextRotationDegrees == 0 {
finalTextY = ly + tb.Height()>>1
} else {
finalTextY = ly
}
tickStyle.WriteToRenderer(r)
r.MoveTo(lx, ly)
if ya.AxisType == YAxisPrimary {
@ -166,15 +179,14 @@ func (ya YAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, tick
r.LineTo(lx-DefaultHorizontalTickWidth, ly)
}
r.Stroke()
Draw.Text(r, t.Label, finalTextX, finalTextY, tickStyle)
}
nameStyle := ya.NameStyle.InheritFrom(defaults)
nameStyle := ya.NameStyle.InheritFrom(defaults.InheritFrom(Style{TextRotationDegrees: 90}))
if ya.NameStyle.Show && len(ya.Name) > 0 {
nameStyle.GetTextOptions().WriteToRenderer(r)
r.SetTextRotation(Math.DegreesToRadians(90))
tb := r.MeasureText(ya.Name)
tb := Draw.MeasureText(r, ya.Name, nameStyle)
var tx int
if ya.AxisType == YAxisPrimary {
@ -183,10 +195,9 @@ func (ya YAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, tick
tx = canvasBox.Left - (DefaultYAxisMargin + int(sw) + maxTextWidth + DefaultYAxisMargin)
}
ty := canvasBox.Bottom - (canvasBox.Height()>>1 + tb.Width()>>1)
ty := canvasBox.Top + (canvasBox.Height()>>1 + tb.Width()>>1)
r.Text(ya.Name, tx, ty)
r.ClearTextRotation()
Draw.Text(r, ya.Name, tx, ty, nameStyle)
}
if ya.Zero.Style.Show {