/
draw_graph.go
139 lines (114 loc) · 2.82 KB
/
draw_graph.go
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package main
import (
"fmt"
"image"
"image/color"
"time"
"GoDriveTracker/stat"
"github.com/llgcode/draw2d"
"github.com/llgcode/draw2d/draw2dimg"
"github.com/llgcode/draw2d/draw2dkit"
)
func init() {
draw2d.SetFontFolder("./static")
}
//
// Histograms Charts
//
func dailyWordHistChart(filename string, width, height int, days []*stat.DailyUserStat, dateLine []time.Time) {
dest := image.NewRGBA(image.Rect(0, 0, width, height))
gc := draw2dimg.NewGraphicContext(dest)
var minVal, maxVal float64 = 0, 0
dayLen := len(days)
xStep := float64(width) / float64(dayLen)
baseLineY := float64(50)
dayAdd := make([]float64, dayLen)
daySub := make([]float64, dayLen)
for i := 0; i < dayLen; i += 1 {
if days[i] == nil {
dayAdd[i] = 0
daySub[i] = 0
} else {
dayAdd[i] = float64(days[i].WordAdd)
daySub[i] = float64(0 - days[i].WordSub)
if dayAdd[i] > maxVal {
maxVal = dayAdd[i]
}
if daySub[i] > minVal {
minVal = daySub[i]
}
}
}
hf := float64(height)
wf := float64(width)
for i := 0; i < dayLen; i += 1 {
dayAdd[i] = (hf - baseLineY) * dayAdd[i] / maxVal
daySub[i] = (baseLineY) * daySub[i] / minVal
}
// Draw Grid Lines
{
gc.SetFillColor(color.RGBA{0x44, 0x44, 0x44, 0xff})
gc.SetStrokeColor(color.RGBA{0x00, 0x00, 0x00, 0xff})
gc.SetLineWidth(0.2)
yStep := 100.0
if maxVal > 10000 {
yStep = 1000.0
} else if maxVal > 1000 {
yStep = 250.0
}
gc.SetFontData(draw2d.FontData{Name: "Roboto", Family: draw2d.FontFamilySans})
for y := yStep; y < maxVal; y += yStep {
yf := (hf - baseLineY) - (hf-baseLineY)*y/maxVal
gc.MoveTo(0, yf)
gc.LineTo(wf, yf)
gc.Stroke()
gc.FillStringAt(fmt.Sprintf("%.0f", y), 10, yf)
}
yStep = 100.0
if minVal > 10000 {
yStep = 1000.0
} else if minVal > 1000 {
yStep = 250.0
}
for y := yStep; y < minVal; y += yStep {
yf := (hf - baseLineY) + baseLineY*y/minVal
gc.MoveTo(0, yf)
gc.LineTo(wf, yf)
}
gc.Stroke()
}
// Add
gc.SetFillColor(color.RGBA{0x44, 0xff, 0x44, 0xff})
for i := 0; i < dayLen; i += 1 {
x := float64(i) * xStep
draw2dkit.Rectangle(gc, x, hf-baseLineY, x+xStep, hf-baseLineY-dayAdd[i])
}
gc.Fill()
// Sub
gc.SetFillColor(color.RGBA{0xff, 0x44, 0x44, 0xff})
for i := 0; i < dayLen; i += 1 {
x := float64(i) * xStep
draw2dkit.Rectangle(gc, x, hf-baseLineY, x+xStep, hf-baseLineY+daySub[i])
}
gc.Fill()
// Draw Base Line
{
gc.SetStrokeColor(color.RGBA{0x00, 0x00, 0x00, 0xff})
gc.SetLineWidth(1)
gc.MoveTo(0, 0)
gc.LineTo(0, hf)
gc.MoveTo(0, hf-baseLineY)
gc.LineTo(wf, hf-baseLineY)
gc.MoveTo(wf, 0)
gc.LineTo(wf, hf)
for i := 0; i < dayLen; i += 1 {
if dateLine[i].Weekday() == time.Monday {
x := float64(i) * xStep
gc.MoveTo(x, hf-baseLineY-10)
gc.LineTo(x, hf-baseLineY+10)
}
}
gc.Stroke()
}
draw2dimg.SaveToPngFile(filename, dest)
}