Add Play/Edit Buttons to Toggle Between Modes

* Instead of needing to press the "P" and "E" keys to toggle from edit
  mode to play mode (and back again), respectively, the UI now draws a
  "Play (P)" or "Edit (E)" button on the bottom right corner of the
  level canvas. Clicking it will toggle the mode.

pkg/balance/theme.go

@@ -54,4 +54,12 @@ var (
 
 	// Color for draggable doodad.
 	DragColor = render.MustHexColor("#0099FF")
+
+	PlayButtonFont = render.Text{
+		FontFilename: "./fonts/DejaVuSans-Bold.ttf",
+		Size:         16,
+		Padding:      4,
+		Color:        render.RGBA(255, 255, 0, 255),
+		Stroke:       render.RGBA(100, 100, 0, 255),
+	}
 )

pkg/editor_scene.go

@@ -125,6 +125,15 @@ func (s *EditorScene) Setup(d *Doodle) error {
 	return nil
 }
 
+// Playtest switches the level into Play Mode.
+func (s *EditorScene) Playtest() {
+	log.Info("Play Mode, Go!")
+	s.d.Goto(&PlayScene{
+		Filename: s.filename,
+		Level:    s.Level,
+	})
+}
+
 // Loop the editor scene.
 func (s *EditorScene) Loop(d *Doodle, ev *events.State) error {
 	// Update debug overlay values.
@@ -148,11 +157,7 @@ func (s *EditorScene) Loop(d *Doodle, ev *events.State) error {
 
 	// Switching to Play Mode?
 	if ev.KeyName.Read() == "p" {
-		log.Info("Play Mode, Go!")
-		d.Goto(&PlayScene{
-			Filename: s.filename,
-			Level:    s.Level,
-		})
+		s.Playtest()
 		return nil
 	}
 

pkg/editor_ui.go

@@ -40,6 +40,7 @@ type EditorUI struct {
 	Workspace  *ui.Frame
 	MenuBar    *ui.Frame
 	StatusBar  *ui.Frame
+	PlayButton *ui.Button
 
 	// Palette window.
 	Palette    *ui.Window
@@ -78,6 +79,15 @@ func NewEditorUI(d *Doodle, s *EditorScene) *EditorUI {
 	u.StatusBar = u.SetupStatusBar(d)
 	u.Workspace = u.SetupWorkspace(d) // important that this is last!
 
+	u.PlayButton = ui.NewButton("Play", ui.NewLabel(ui.Label{
+		Text: "Play (P)",
+		Font: balance.PlayButtonFont,
+	}))
+	u.PlayButton.Handle(ui.Click, func(p render.Point) {
+		u.Scene.Playtest()
+	})
+	u.Supervisor.Add(u.PlayButton)
+
 	// Position the Canvas inside the frame.
 	u.Workspace.Pack(u.Canvas, ui.Pack{
 		Anchor: ui.N,
@@ -151,6 +161,23 @@ func (u *EditorUI) Resized(d *Doodle) {
 
 		u.ExpandCanvas(d.Engine)
 	}
+
+	// Position the Play button over the workspace.
+	{
+		btn := u.PlayButton
+		btn.Compute(d.Engine)
+
+		var (
+			wsP           = u.Workspace.Point()
+			wsSize        = u.Workspace.Size()
+			btnSize       = btn.Size()
+			padding int32 = 8
+		)
+		btn.MoveTo(render.NewPoint(
+			wsP.X+wsSize.W-btnSize.W-padding,
+			wsP.Y+wsSize.H-btnSize.H-padding,
+		))
+	}
 }
 
 // Loop to process events and update the UI.
@@ -221,6 +248,7 @@ func (u *EditorUI) Present(e render.Engine) {
 	u.MenuBar.Present(e, u.MenuBar.Point())
 	u.StatusBar.Present(e, u.StatusBar.Point())
 	u.Workspace.Present(e, u.Workspace.Point())
+	u.PlayButton.Present(e, u.PlayButton.Point())
 
 	// Are we dragging a Doodad canvas?
 	if u.Supervisor.IsDragging() {

pkg/play_scene.go

@@ -5,6 +5,7 @@ import (
 
 	"git.kirsle.net/apps/doodle/lib/events"
 	"git.kirsle.net/apps/doodle/lib/render"
+	"git.kirsle.net/apps/doodle/lib/ui"
 	"git.kirsle.net/apps/doodle/pkg/balance"
 	"git.kirsle.net/apps/doodle/pkg/doodads"
 	"git.kirsle.net/apps/doodle/pkg/level"
@@ -24,6 +25,10 @@ type PlayScene struct {
 	drawing   *uix.Canvas
 	scripting *scripting.Supervisor
 
+	// UI widgets.
+	supervisor *ui.Supervisor
+	editButton *ui.Button
+
 	// Custom debug labels.
 	debPosition   *string
 	debViewport   *string
@@ -43,6 +48,7 @@ func (s *PlayScene) Name() string {
 func (s *PlayScene) Setup(d *Doodle) error {
 	s.d = d
 	s.scripting = scripting.NewSupervisor()
+	s.supervisor = ui.NewSupervisor()
 
 	// Initialize debug overlay values.
 	s.debPosition = new(string)
@@ -56,6 +62,16 @@ func (s *PlayScene) Setup(d *Doodle) error {
 		{"Scroll:", s.debScroll},
 	}
 
+	// Initialize the "Edit Map" button.
+	s.editButton = ui.NewButton("Edit", ui.NewLabel(ui.Label{
+		Text: "Edit (E)",
+		Font: balance.PlayButtonFont,
+	}))
+	s.editButton.Handle(ui.Click, func(p render.Point) {
+		s.EditLevel()
+	})
+	s.supervisor.Add(s.editButton)
+
 	// Initialize the drawing canvas.
 	s.drawing = uix.NewCanvas(balance.ChunkSize, false)
 	s.drawing.Name = "play-canvas"
@@ -114,6 +130,15 @@ func (s *PlayScene) Setup(d *Doodle) error {
 	return nil
 }
 
+// EditLevel toggles out of Play Mode to edit the level.
+func (s *PlayScene) EditLevel() {
+	log.Info("Edit Mode, Go!")
+	s.d.Goto(&EditorScene{
+		Filename: s.Filename,
+		Level:    s.Level,
+	})
+}
+
 // Loop the editor scene.
 func (s *PlayScene) Loop(d *Doodle, ev *events.State) error {
 	// Update debug overlay values.
@@ -122,6 +147,8 @@ func (s *PlayScene) Loop(d *Doodle, ev *events.State) error {
 	*s.debViewport = s.drawing.Viewport().String()
 	*s.debScroll = s.drawing.Scroll.String()
 
+	s.supervisor.Loop(ev)
+
 	// Has the window been resized?
 	if resized := ev.Resized.Now; resized {
 		w, h := d.Engine.WindowSize()
@@ -135,11 +162,7 @@ func (s *PlayScene) Loop(d *Doodle, ev *events.State) error {
 
 	// Switching to Edit Mode?
 	if ev.KeyName.Read() == "e" {
-		log.Info("Edit Mode, Go!")
-		d.Goto(&EditorScene{
-			Filename: s.Filename,
-			Level:    s.Level,
-		})
+		s.EditLevel()
 		return nil
 	}
 
@@ -167,6 +190,17 @@ func (s *PlayScene) Draw(d *Doodle) error {
 	// Draw out bounding boxes.
 	d.DrawCollisionBox(s.Player)
 
+	// Draw the Edit button.
+	var (
+		canSize       = s.drawing.Size()
+		size          = s.editButton.Size()
+		padding int32 = 8
+	)
+	s.editButton.Present(d.Engine, render.Point{
+		X: canSize.W - size.W - padding,
+		Y: canSize.H - size.H - padding,
+	})
+
 	return nil
 }