package main

import (
	"image"
	"image/color"
	"image/png"
	"log"
	"os"

	"golang.org/x/image/math/f32"
	"golang.org/x/image/vector"
)

type ctx struct {
	dst *image.RGBA
	ra  *vector.Rasterizer
}

func (c *ctx) moveTo(x, y float32) {
	c.ra.MoveTo(f32.Vec2{x, y})
}

func (c *ctx) lineTo(x, y float32) {
	c.ra.LineTo(f32.Vec2{x, y})
}

func (c *ctx) draw(argb uint32) {
	src := image.NewUniform(color.NRGBA{
		A: uint8((argb >> 24) & 0xff),
		R: uint8((argb >> 16) & 0xff),
		G: uint8((argb >> 8) & 0xff),
		B: uint8(argb & 0xff),
	})
	c.ra.Draw(c.dst, c.dst.Bounds(), src, image.ZP)
	c.ra.Reset(c.dst.Bounds().Dx(), c.dst.Bounds().Dy())
}

func (c *ctx) writePng(fn string) {
	file, err := os.Create(fn)
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()
	if err := png.Encode(file, c.dst); err != nil {
		log.Fatal(err)
	}
}

func main() {
	const w, h = 1280, 720
	ctx := ctx{
		dst: image.NewRGBA(image.Rect(0, 0, w, h)),
		ra:  vector.NewRasterizer(w, h),
	}
	parse(&ctx)
	ctx.writePng("vector.png")
}