diff --git a/examples/perspective/main.go b/examples/perspective/main.go
index c0376008d..918fa9f65 100644
--- a/examples/perspective/main.go
+++ b/examples/perspective/main.go
@@ -38,17 +38,25 @@ func update(screen *ebiten.Image) error {
 	if ebiten.IsRunningSlowly() {
 		return nil
 	}
+
+	// Split the image into horizontal lines and draw them with different scales.
 	op := &ebiten.DrawImageOptions{}
 	w, h := gophersImage.Size()
 	for i := 0; i < h; i++ {
 		op.GeoM.Reset()
-		width := w + i*3/4
-		x := ((h - i) * 3 / 4) / 2
-		op.GeoM.Scale(float64(width)/float64(w), 1)
-		op.GeoM.Translate(float64(x), float64(i))
-		maxWidth := float64(w) + float64(h)*3/4
-		op.GeoM.Translate(-maxWidth/2, -float64(h)/2)
+
+		// Move the image's center to the upper-left corner.
+		op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
+
+		// Scale each lines and adjust the position.
+		lineW := w + i*3/4
+		x := -float64(lineW) / float64(w) / 2
+		op.GeoM.Scale(float64(lineW)/float64(w), 1)
+		op.GeoM.Translate(x, float64(i))
+
+		// Move the image's center to the screen's center.
 		op.GeoM.Translate(screenWidth/2, screenHeight/2)
+
 		r := image.Rect(0, i, w, i+1)
 		op.SourceRect = &r
 		screen.DrawImage(gophersImage, op)