~mendelmaleh/dummy

ref: 494d45fc9e9da252c50728de24cd2fadf27384f8 dummy/options.go -rw-r--r-- 2.3 KiB
494d45fcMendel E Add text rendering 1 year, 6 months ago
                                                                                
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package main

import (
	"image/color"
	"net/url"
	"strconv"

	"github.com/golang/freetype/truetype"
)

type Options struct {
	// image
	Width, Height int
	Pattern       string
	Colors        []color.RGBA

	// text
	Text      string
	Font      *truetype.Font
	Size, DPI float64

	// web
	Desc string
}

// to be used only with dopt.Copy(), otherwise the default colors can be changed.
var dopt = &Options{
	// image
	Width:   200,
	Height:  200,
	Pattern: "plain",
	Colors: []color.RGBA{
		color.RGBA{0, 0, 0, 0xff},
		color.RGBA{0xff, 0xff, 0xff, 0xff},
	},

	// text // default font is set in main after its loaded.
	Size: 80,
	DPI:  72,

	// web
	Desc: "Dummy image generator",
}

// FromForm gets values from the form (which includes the url encoded query)
// and applies them to our Options. To ne used with r.Form after r.ParseForm().
func (opt *Options) FromForm(form url.Values) error {
	// image
	if w, ok := form["width"]; ok {
		i, err := strconv.Atoi(w[0])
		if err != nil {
			return err
		}

		opt.Width = i
	}

	if h, ok := form["height"]; ok {
		i, err := strconv.Atoi(h[0])
		if err != nil {
			return err
		}

		opt.Height = i
	}

	if p, ok := form["pattern"]; ok {
		opt.Pattern = p[0]
	}

	if colors, ok := form["color"]; ok {
		for i, h := range colors {
			c, err := Hex(h)
			if err != nil {
				return err
			}

			opt.Colors[i] = c
		}
	}

	// text
	if t, ok := form["text"]; ok {
		opt.Text = t[0]
	}

	if v, ok := form["font"]; ok {
		// TODO: less strict font matching
		if f, ok := fonts[v[0]]; ok {
			opt.Font = f
		}
	}

	if s, ok := form["size"]; ok {
		f, err := strconv.ParseFloat(s[0], 64)
		if err != nil {
			return err
		}

		opt.Size = f
	}

	if d, ok := form["dpi"]; ok {
		f, err := strconv.ParseFloat(d[0], 64)
		if err != nil {
			return err
		}

		opt.DPI = f
	}

	// web
	if d, ok := form["desc"]; ok {
		opt.Desc = d[0]
	}

	// apply limits and hacks
	opt.Normalize()

	return nil
}

// Copy so that the original options don't change (essentially a deep copy).
func (opt Options) Copy() (copt Options) {
	// copy all the fields
	copt = opt

	// deep copy for slices
	copt.Colors = make([]color.RGBA, len(opt.Colors))
	copy(copt.Colors, opt.Colors)

	return copt
}

// Normalize our Options, implement limits and workarounds.
func (opt *Options) Normalize() {
	// limit width to 600 for now
	if opt.Width > 600 {
		opt.Width = 600
	}
}