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drawer.go
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drawer.go
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package spline
import (
"image"
"image/color"
"image/png"
_ "image/jpeg"
"os"
"fmt"
"text/template"
"io"
"image/draw"
)
type ImageDrawer interface {
Draw(io.Writer, [][]float64, bool)
}
type Point struct {
X float64
Y float64
}
type Line struct {
Start Point
End Point
}
type SVG struct {
Width int
Height int
Title string
Lines []Line
Color color.NRGBA
Description string
StrokeLineCap string
StrokeWidth float64
}
type Image struct {
Width int
Height int
Color color.NRGBA
}
func Pt(x float64, y float64) Point {
return Point{X: x, Y: y}
}
func (svg *SVG) Draw(output io.Writer, points [][]float64, debug bool) {
const TEMPLATE = `<?xml version="1.0" ?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="{{.Width}}px" height="{{.Height}}px" viewBox="0 0 {{.Width}} {{.Height}}"
xmlns="http://www.w3.org/2000/svg" version="1.1">
<title>{{.Title}}</title>
<desc>{{.Description}}</desc>
<!-- Points -->
<g stroke="rgba({{.Color.R}},{{.Color.G}},{{.Color.B}},{{.Color.A}})" stroke-linecap="{{.StrokeLineCap}}" stroke-width="{{.StrokeWidth}}" fill="none">
{{range .Lines}}
<path d="M{{.Start.X}},{{.Start.Y}} L{{.End.X}},{{.End.Y}}" />
{{end}}</g>
</svg>`
var interpol []float64
var lines []Line
spline := NewBSpline(points, 3, false)
spline.Init()
oldX := spline.Interpolate(0.0, 0.1)[0]
oldY := spline.Interpolate(0.0, 0.1)[1]
pointStart := Pt(oldX, oldY)
for t := 0.0; t <= 1.0; t += 0.002 {
interpol = spline.Interpolate(t, 0.1)
x := interpol[0]
y := interpol[1]
pointEnd := Pt(x, y)
oldX, oldY = x, y
lines = append(lines, []Line{Line{pointStart, pointEnd}}...)
pointStart = Pt(oldX, oldY)
}
svg.Lines = lines
tmpl := template.Must(template.New("svg").Parse(TEMPLATE))
if err := tmpl.Execute(output, svg); err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
}
func (img *Image) Draw(output io.Writer, points [][]float64, debug bool) {
matrix := Identity()
canvas := Canvas{
image.NewRGBA(image.Rect(0, 0, img.Width, img.Height)),
matrix,
}
spline := NewBSpline(points, 3, false)
spline.Init()
oldX := spline.Interpolate(0.0, 0.5)[0]
oldY := spline.Interpolate(0.0, 0.5)[1]
var interpol []float64
var raster *Canvas
// Draw white background
background := color.RGBA{255, 255, 255, 255}
draw.Draw(canvas.Image, canvas.Image.Bounds(), &image.Uniform{background}, image.ZP, draw.Src)
// Draw original line
if debug {
for i:=0; i < len(points)-1; i++ {
raster = canvas.DrawLine(
points[i][0],
points[i][1],
points[i+1][0],
points[i+1][1],
color.NRGBA{R:155,G:155,B:155,A:70 }, false)
}
}
for t := 0.0; t <= 1.0; t += 0.001 {
interpol = spline.Interpolate(t, 0.5)
x := interpol[0]
y := interpol[1]
raster = canvas.DrawLine(oldX, oldY, x, y, img.Color, true)
oldX, oldY = x, y
}
png.Encode(output, raster)
}