Create basic image creation tool

.gitignore

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+out.png

go.mod

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+module github.com/writeas/text-pic
+
+go 1.13
+
+require (
+	github.com/fogleman/gg v1.3.0
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
+	github.com/writeas/web-core v1.2.0
+	golang.org/x/image v0.0.0-20201208152932-35266b937fa6 // indirect
+)

main.go

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+package main
+
+import (
+	"fmt"
+	"image/color"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/fogleman/gg"
+	"github.com/writeas/web-core/log"
+)
+
+func main() {
+	log.Info("Starting...")
+	start := time.Now()
+	err := run()
+	if err != nil {
+		log.Error("%s", err)
+		os.Exit(1)
+	}
+	log.Info("Completed in %s", time.Since(start))
+}
+
+func loadFont(dc *gg.Context, bold bool, points float64) error {
+	fontLoraBoldPath := filepath.Join("fonts", "Lora-Bold.ttf")
+	fontLoraPath := filepath.Join("fonts", "Lora-Regular.ttf")
+	path := fontLoraPath
+	if bold {
+		path = fontLoraBoldPath
+	}
+
+	err := dc.LoadFontFace(path, points)
+	if err != nil {
+		return fmt.Errorf("load bold font: %s", err)
+	}
+	return nil
+}
+
+func run() error {
+	w := 900
+	h := 900
+	wf := float64(w)
+	hf := float64(h)
+	dc := gg.NewContext(w, h)
+	dc.DrawRectangle(0, 0, wf, hf)
+	dc.SetRGB(1, 1, 1)
+	dc.Fill()
+
+	// Define margins for footer text
+	footerFontSize := 32.0
+	footerMargin := 20.0
+	x := footerMargin
+	y := footerMargin
+	footerMarginY := 20.0
+
+	// Content parameters
+	contentFontSize := 48.0
+	lineSpacing := 1.8
+	contentRightMargin := 50.0
+	contentTopMargin := 50.0
+
+	// Create bold instance name
+	err := loadFont(dc, true, footerFontSize)
+	if err != nil {
+		return err
+	}
+	instance := "write.as"
+	baseTextWidth, textHeight := dc.MeasureString(instance)
+
+	// Create user path
+	err = loadFont(dc, false, footerFontSize)
+	if err != nil {
+		return err
+	}
+	dc.SetColor(color.Black)
+
+	userPath := "/matt"
+	userTextWidth, _ := dc.MeasureString(userPath)
+	// x = canvas halfway point - total text width halfway point
+	x = wf/2 - (baseTextWidth+userTextWidth)/2
+	y = hf - textHeight - footerMarginY
+	err = loadFont(dc, true, footerFontSize)
+	if err != nil {
+		return err
+	}
+	dc.DrawString(instance, x, y)
+
+	// x = original x coordinate + base text width
+	x += baseTextWidth
+	y = hf - textHeight - footerMarginY
+	err = loadFont(dc, false, footerFontSize)
+	if err != nil {
+		return err
+	}
+	dc.DrawString(userPath, x, y)
+
+	// Draw the content
+	err = loadFont(dc, false, contentFontSize)
+	if err != nil {
+		return err
+	}
+	s := "The rest of the travelers in our flying bus napped or stared listlessly at a shiny slab in their lap and the staring yellow orb morphed into a full circle out in the blue. As we banked to the right — a nod to its awakening — it seemed to rest in acknowledgement, hanging for a moment on the invisible horizon."
+	x = contentRightMargin
+	y = contentTopMargin
+	maxWidth := float64(dc.Width()) - contentRightMargin - contentRightMargin
+	dc.DrawStringWrapped(s, x, y, 0, 0, maxWidth, lineSpacing, gg.AlignLeft)
+
+	err = dc.SavePNG("out.png")
+	if err != nil {
+		return fmt.Errorf("save png: %s", err)
+	}
+	return nil
+}