Fix code review issues: remove unused code and fix benchmark

Co-authored-by: llgcode <524083+llgcode@users.noreply.github.com>

Author: Copilot

draw2dgles2/gc.go

@@ -8,13 +8,11 @@ import (
 	"image"
 	"image/color"
 	"log"
-	"unsafe"
 
 	"github.com/go-gl/gl/v2.1/gl"
 	"github.com/golang/freetype/truetype"
 	"github.com/llgcode/draw2d"
 	"github.com/llgcode/draw2d/draw2dbase"
-	"github.com/llgcode/draw2d/draw2dimg"
 
 	"golang.org/x/image/font"
 	"golang.org/x/image/math/fixed"
@@ -658,12 +656,5 @@ func fUnitsToFloat64(x fixed.Int26_6) float64 {
 	return float64(scaled/256) + float64(scaled%256)/256.0
 }
 
-// Ensure pathFlattener implements the Flattener interface
-var _ draw2dbase.Flattener = (*pathFlattener)(nil)
-
 // Make sure the interface is satisfied at compile time
 var _ draw2d.GraphicContext = (*GraphicContext)(nil)
-
-func init() {
-	_ = unsafe.Sizeof(Point2D{})
-}

draw2dgles2/triangulate_test.go

@@ -4,6 +4,7 @@
 package draw2dgles2
 
 import (
+	"math"
 	"testing"
 )
 
@@ -196,13 +197,13 @@ func BenchmarkTriangulate(b *testing.B) {
 }
 
 func BenchmarkTriangulateLarge(b *testing.B) {
-	// Create a polygon with many vertices
+	// Create a polygon with many vertices (circular pattern)
 	vertices := make([]Point2D, 100)
 	for i := 0; i < 100; i++ {
-		angle := float32(i) * 3.14159 * 2 / 100
+		angle := float64(i) * 3.14159 * 2 / 100
 		vertices[i] = Point2D{
-			X: 50 + 40*float32(cos(float64(angle))),
-			Y: 50 + 40*float32(sin(float64(angle))),
+			X: 50 + 40*float32(math.Cos(angle)),
+			Y: 50 + 40*float32(math.Sin(angle)),
 		}
 	}
 
@@ -211,13 +212,3 @@ func BenchmarkTriangulateLarge(b *testing.B) {
 		Triangulate(vertices)
 	}
 }
-
-func cos(x float64) float64 {
-	// Simple cos approximation for benchmark
-	return float64(Point2D{}.X) // Placeholder
-}
-
-func sin(x float64) float64 {
-	// Simple sin approximation for benchmark
-	return float64(Point2D{}.Y) // Placeholder
-}