very small start on handling key presses

cmd/web/main.go

@@ -4,6 +4,7 @@ import (
 	"image/color"
 	"sync"
 	"time"
+	"syscall/js"
 
 	"github.com/llgcode/draw2d/draw2dimg"
 	"github.com/llgcode/draw2d/draw2dkit"
@@ -20,9 +21,19 @@ var sizeMultiplier = 8
 var drawBuf = [64 * 32]byte{}
 var drawNeeded = false
 var graphicsLock sync.Mutex
+var window js.Value
+
+var keyPressHandler js.Func = js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+	println(args[0].Get("type").String())
+	println(args[0].Get("keyCode").Int())
+	return nil
+})
 
 func main() {
 	println("CHIP8 IS HERE!")
+	window = js.Global()
+
+	window.Call("addEventListener", "keydown", keyPressHandler)
 
 	cvs, _ = canvas.NewCanvas2d(false)
 	cvs.Create(int(width)*sizeMultiplier, int(height)*sizeMultiplier)
@@ -30,7 +41,7 @@ func main() {
 	height = float64(cvs.Height())
 	width = float64(cvs.Width())
 
-	cpu := chip8.NewCHIP8(getPong())
+	cpu := chip8.NewCHIP8(getSpaceInvaders())
 
 	cvs.Start(60, Render)
 	i := 0