Redesign structure of application

penTool.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	raylib "github.com/gen2brain/raylib-go/raylib"
+)
+
+type penTool struct {
+	Color   raylib.Color
+	Size    float32
+	Opacity float32
+	Points  []raylib.Vector2
+}
+
+func (p *penTool) Draw(offset raylib.Vector2) {
+	for i := 0; i < len(p.Points)-1; i++ {
+		startPoint := raylib.Vector2Add(p.Points[i], offset)
+		endPoint := raylib.Vector2Add(p.Points[i+1], offset)
+
+		raylib.DrawLineEx(startPoint, endPoint, p.Size, p.Color)
+		raylib.DrawCircle(int32(startPoint.X), int32(startPoint.Y), p.Size/2, p.Color)
+	}
+}