From 4bf3b2fc0d6308e862c7c0b96d41b65b5aa91cd6 Mon Sep 17 00:00:00 2001
From: potassium <arsenijser19@gmail.com>
Date: Sun, 26 Jan 2025 22:04:52 +0300
Subject: [PATCH] fps counter

---
 chatgpt.go | 37 +++++++++++++++++++++++++++++++++++++
 go.mod     |  5 +++++
 go.sum     |  4 ++++
 3 files changed, 46 insertions(+)

diff --git a/chatgpt.go b/chatgpt.go
index edc2ad0..a0ca264 100644
--- a/chatgpt.go
+++ b/chatgpt.go
@@ -1,15 +1,22 @@
 package main
 
 import (
+	"fmt"
 	"image"
 	"image/color"
 	"image/draw"
 	"math"
+	"time"
 
 	"git.niplace.ru/XoxJlopeZi4BB/dev/fb"
+	"github.com/golang/freetype"
+	"github.com/golang/freetype/truetype"
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/gofont/gomono"
 )
 
 var Width, Height = fb.Resolution()
+
 const (
 	cubeSize     = 50
 	Zoom         = 1000.0
@@ -118,12 +125,31 @@ func main() {
 
 	// Palette for the GIF
 	palette := []color.Color{color.Black, color.White}
+	var (
+		fontSize = 96.0
+		DPI      = 72.0
+		spacing  = 1.5
+	)
+	f, err := truetype.Parse(gomono.TTF)
+	if err != nil {
+		panic(err)
+	}
+	ctx := freetype.NewContext()
+	ctx.SetDPI(DPI)
+	ctx.SetFont(f)
+	ctx.SetFontSize(fontSize)
+	ctx.SetClip(image.Rect(0, 0, Width, Height))
+	ctx.SetSrc(image.NewUniform(palette[1]))
+	ctx.SetHinting(font.HintingNone)
 
+	var text string = "text"
+	var fps int
 	// Generate frames
 	for i := 0; i < frameCount; i++ {
 		angle := float64(i) * rotationStep
 		img := image.NewPaletted(image.Rect(0, 0, Width, Height), palette)
 		draw.Draw(img, img.Bounds(), &image.Uniform{color.Black}, image.Point{}, draw.Src)
+		ctx.SetDst(img)
 
 		// Rotate and project vertices
 		projVertices := make([]Point2D, len(vertices))
@@ -139,9 +165,20 @@ func main() {
 			drawLine(img, p1, p2, color.White)
 		}
 
+		text = fmt.Sprint(fps)
+		pt := freetype.Pt(30, 30+int(ctx.PointToFixed(fontSize)>>6))
+		_, err = ctx.DrawString(text, pt)
+		if err != nil {
+			panic(err)
+		}
+		pt.Y += ctx.PointToFixed(fontSize * spacing)
+
+		t := time.Now()
 		err := fb.Draw(img)
 		if err != nil {
 			panic(err)
 		}
+		d := time.Since(t)
+		fps = int(time.Second / d)
 	}
 }
diff --git a/go.mod b/go.mod
index ac27739..df747ff 100644
--- a/go.mod
+++ b/go.mod
@@ -3,3 +3,8 @@ module git.niplace.ru/XoxJlopeZi4BB/cube
 go 1.23.4
 
 require git.niplace.ru/XoxJlopeZi4BB/dev v0.0.0-20250126033838-b2021445b668
+
+require (
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
+	golang.org/x/image v0.23.0 // indirect
+)
diff --git a/go.sum b/go.sum
index 1e75d79..9aaac9f 100644
--- a/go.sum
+++ b/go.sum
@@ -2,3 +2,7 @@ git.niplace.ru/XoxJlopeZi4BB/dev v0.0.0-20250126033410-5c05476970ae h1:anDr2+Kui
 git.niplace.ru/XoxJlopeZi4BB/dev v0.0.0-20250126033410-5c05476970ae/go.mod h1:7YjlidjZZr0+dNjfgYgy5hPfdE3pV1bBT5UcNvz5LjY=
 git.niplace.ru/XoxJlopeZi4BB/dev v0.0.0-20250126033838-b2021445b668 h1:Kh9BL+0ia8Lo+lvIsZ3a5pYqzq9ZYwk0+gho7L7BASI=
 git.niplace.ru/XoxJlopeZi4BB/dev v0.0.0-20250126033838-b2021445b668/go.mod h1:7YjlidjZZr0+dNjfgYgy5hPfdE3pV1bBT5UcNvz5LjY=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+golang.org/x/image v0.23.0 h1:HseQ7c2OpPKTPVzNjG5fwJsOTCiiwS4QdsYi5XU6H68=
+golang.org/x/image v0.23.0/go.mod h1:wJJBTdLfCCf3tiHa1fNxpZmUI4mmoZvwMCPP0ddoNKY=