Editor Mode: Line Tool and Rectangle Tool

* Add support for the LineTool and RectTool while in the EditorMode to
  easily draw straight lines and rectangle outlines.
* Key bindings were added to toggle tools in lieu of a proper UI to
  select the tool from a toolbar.
  * "F" for Pencil (Freehand) Tool (since "P" is for "Playtest")
  * "L" for Line Tool
  * "R" for Rectangle Tool

README.md

@@ -69,6 +69,16 @@ Cursor Keys
   Scroll the view of the map around.
 "P" Key
   Playtest the current map you're working on.
+"F" Key
+  Switch to the Pencil (Freehand) Tool
+"L" Key
+  Switch to the Line Tool
+"R" Key
+  Switch to the Rectangle Tool
+Ctrl-Z
+  Undo
+Ctrl-Y
+  Redo
 ```
 
 # Built-In Doodads

lib/render/interface.go

@@ -235,3 +235,44 @@ func IterLine(x1, y1, x2, y2 int32) chan Point {
 func IterLine2(p1 Point, p2 Point) chan Point {
 	return IterLine(p1.X, p1.Y, p2.X, p2.Y)
 }
+
+// IterRect loops through all the points forming a rectangle between the
+// top-left point and the bottom-right point.
+func IterRect(p1, p2 Point) chan Point {
+	generator := make(chan Point)
+
+	go func() {
+		var (
+			TopLeft     = p1
+			BottomRight = p2
+			TopRight    = Point{
+				X: BottomRight.X,
+				Y: TopLeft.Y,
+			}
+			BottomLeft = Point{
+				X: TopLeft.X,
+				Y: BottomRight.Y,
+			}
+		)
+
+		// Trace all four edges and yield it.
+		var edges = []struct {
+			A Point
+			B Point
+		}{
+			{TopLeft, TopRight},
+			{TopLeft, BottomLeft},
+			{BottomLeft, BottomRight},
+			{TopRight, BottomRight},
+		}
+		for _, edge := range edges {
+			for pt := range IterLine2(edge.A, edge.B) {
+				generator <- pt
+			}
+		}
+
+		close(generator)
+	}()
+
+	return generator
+}

pkg/drawtool/stroke.go

@@ -61,6 +61,10 @@ func (s *Stroke) IterPoints() chan render.Point {
 			for point := range render.IterLine2(s.PointA, s.PointB) {
 				ch <- point
 			}
+		case Rectangle:
+			for point := range render.IterRect(s.PointA, s.PointB) {
+				ch <- point
+			}
 		}
 		close(ch)
 	}()

pkg/drawtool/tools.go

@@ -1,4 +1,4 @@
-package uix
+package drawtool
 
 // Tool is a draw mode for an editable Canvas.
 type Tool int
@@ -6,12 +6,16 @@ type Tool int
 // Draw modes for editable Canvas.
 const (
 	PencilTool Tool = iota // draw pixels where the mouse clicks
+	LineTool
+	RectTool
 	ActorTool // drag and move actors
 	LinkTool
 )
 
 var toolNames = []string{
 	"Pencil",
+	"Line",
+	"Rectangle",
 	"Doodad", // readable name for ActorTool
 	"Link",
 }

pkg/editor_scene.go

@@ -9,6 +9,7 @@ import (
 	"git.kirsle.net/apps/doodle/lib/events"
 	"git.kirsle.net/apps/doodle/lib/render"
 	"git.kirsle.net/apps/doodle/pkg/doodads"
+	"git.kirsle.net/apps/doodle/pkg/drawtool"
 	"git.kirsle.net/apps/doodle/pkg/enum"
 	"git.kirsle.net/apps/doodle/pkg/level"
 	"git.kirsle.net/apps/doodle/pkg/log"
@@ -167,9 +168,18 @@ func (s *EditorScene) Loop(d *Doodle, ev *events.State) error {
 	s.UI.Loop(ev)
 
 	// Switching to Play Mode?
-	if ev.KeyName.Read() == "p" {
+	switch ev.KeyName.Read() {
+	case "p":
 		s.Playtest()
-		return nil
+	case "l":
+		d.Flash("Line Tool selected.")
+		s.UI.Canvas.Tool = drawtool.LineTool
+	case "f":
+		d.Flash("Pencil Tool selected.")
+		s.UI.Canvas.Tool = drawtool.PencilTool
+	case "r":
+		d.Flash("Rectangle Tool selected.")
+		s.UI.Canvas.Tool = drawtool.RectTool
 	}
 
 	return nil

pkg/editor_ui.go

@@ -11,6 +11,7 @@ import (
 	"git.kirsle.net/apps/doodle/pkg/balance"
 	"git.kirsle.net/apps/doodle/pkg/branding"
 	"git.kirsle.net/apps/doodle/pkg/doodads"
+	"git.kirsle.net/apps/doodle/pkg/drawtool"
 	"git.kirsle.net/apps/doodle/pkg/enum"
 	"git.kirsle.net/apps/doodle/pkg/level"
 	"git.kirsle.net/apps/doodle/pkg/log"
@@ -311,7 +312,7 @@ func (u *EditorUI) SetupCanvas(d *Doodle) *uix.Canvas {
 		b.Actor.AddLink(idA)
 
 		// Reset the Link tool.
-		drawing.Tool = uix.ActorTool
+		drawing.Tool = drawtool.ActorTool
 		d.Flash("Linked '%s' and '%s' together", a.Doodad.Title, b.Doodad.Title)
 	}
 

pkg/editor_ui_palette.go

@@ -4,9 +4,9 @@ import (
 	"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/drawtool"
 	"git.kirsle.net/apps/doodle/pkg/enum"
 	"git.kirsle.net/apps/doodle/pkg/log"
-	"git.kirsle.net/apps/doodle/pkg/uix"
 )
 
 // SetupPalette sets up the palette panel.
@@ -31,11 +31,11 @@ func (u *EditorUI) SetupPalette(d *Doodle) *ui.Window {
 		}))
 		tab.Handle(ui.Click, func(p render.Point) {
 			if u.paletteTab == "Palette" {
-				u.Canvas.Tool = uix.PencilTool
+				u.Canvas.Tool = drawtool.PencilTool
 				u.PaletteTab.Show()
 				u.DoodadTab.Hide()
 			} else {
-				u.Canvas.Tool = uix.ActorTool
+				u.Canvas.Tool = drawtool.ActorTool
 				u.PaletteTab.Hide()
 				u.DoodadTab.Show()
 			}

pkg/uix/canvas.go

@@ -30,7 +30,7 @@ type Canvas struct {
 	Scrollable bool // Cursor keys will scroll the viewport of this canvas.
 
 	// Selected draw tool/mode, default Pencil, for editable canvases.
-	Tool Tool
+	Tool drawtool.Tool
 
 	// MaskColor will force every pixel to render as this color regardless of
 	// the palette index of that pixel. Otherwise pixels behave the same and

pkg/uix/canvas_editable.go

@@ -21,7 +21,7 @@ func (w *Canvas) loopEditable(ev *events.State) error {
 	)
 
 	switch w.Tool {
-	case PencilTool:
+	case drawtool.PencilTool:
 		// If no swatch is active, do nothing with mouse clicks.
 		if w.Palette.ActiveSwatch == nil {
 			return nil
@@ -90,7 +90,73 @@ func (w *Canvas) loopEditable(ev *events.State) error {
 
 			w.lastPixel = nil
 		}
-	case ActorTool:
+	case drawtool.LineTool:
+		// If no swatch is active, do nothing with mouse clicks.
+		if w.Palette.ActiveSwatch == nil {
+			return nil
+		}
+
+		// Clicking? Log all the pixels while doing so.
+		if ev.Button1.Now {
+			// Initialize a new Stroke for this atomic drawing operation?
+			if w.currentStroke == nil {
+				w.currentStroke = drawtool.NewStroke(drawtool.Line, w.Palette.ActiveSwatch.Color)
+				w.currentStroke.ExtraData = w.Palette.ActiveSwatch
+				w.currentStroke.PointA = render.NewPoint(cursor.X, cursor.Y)
+				w.AddStroke(w.currentStroke)
+			}
+
+			w.currentStroke.PointB = render.NewPoint(cursor.X, cursor.Y)
+		} else {
+			// Mouse released, commit the points to the drawing.
+			if w.currentStroke != nil {
+				for pt := range render.IterLine2(w.currentStroke.PointA, w.currentStroke.PointB) {
+					w.chunks.Set(pt, w.Palette.ActiveSwatch)
+				}
+
+				// Add the stroke to level history.
+				if w.level != nil {
+					w.level.UndoHistory.AddStroke(w.currentStroke)
+				}
+
+				w.RemoveStroke(w.currentStroke)
+				w.currentStroke = nil
+			}
+		}
+	case drawtool.RectTool:
+		// If no swatch is active, do nothing with mouse clicks.
+		if w.Palette.ActiveSwatch == nil {
+			return nil
+		}
+
+		// Clicking? Log all the pixels while doing so.
+		if ev.Button1.Now {
+			// Initialize a new Stroke for this atomic drawing operation?
+			if w.currentStroke == nil {
+				w.currentStroke = drawtool.NewStroke(drawtool.Rectangle, w.Palette.ActiveSwatch.Color)
+				w.currentStroke.ExtraData = w.Palette.ActiveSwatch
+				w.currentStroke.PointA = render.NewPoint(cursor.X, cursor.Y)
+				w.AddStroke(w.currentStroke)
+			}
+
+			w.currentStroke.PointB = render.NewPoint(cursor.X, cursor.Y)
+		} else {
+			// Mouse released, commit the points to the drawing.
+			if w.currentStroke != nil {
+				for pt := range render.IterRect(w.currentStroke.PointA, w.currentStroke.PointB) {
+					w.chunks.Set(pt, w.Palette.ActiveSwatch)
+				}
+
+				// Add the stroke to level history.
+				if w.level != nil {
+					w.level.UndoHistory.AddStroke(w.currentStroke)
+				}
+
+				w.RemoveStroke(w.currentStroke)
+				w.currentStroke = nil
+			}
+		}
+	case drawtool.ActorTool:
 		// See if any of the actors are below the mouse cursor.
 		var WP = w.WorldIndexAt(cursor)
 
@@ -134,7 +200,7 @@ func (w *Canvas) loopEditable(ev *events.State) error {
 		if len(deleteActors) > 0 && w.OnDeleteActors != nil {
 			w.OnDeleteActors(deleteActors)
 		}
-	case LinkTool:
+	case drawtool.LinkTool:
 		// See if any of the actors are below the mouse cursor.
 		var WP = w.WorldIndexAt(cursor)
 

pkg/uix/canvas_link_tool.go

@@ -3,12 +3,13 @@ package uix
 import (
 	"errors"
 
+	"git.kirsle.net/apps/doodle/pkg/drawtool"
 	"git.kirsle.net/apps/doodle/pkg/shmem"
 )
 
 // LinkStart initializes the Link tool.
 func (w *Canvas) LinkStart() {
-	w.Tool = LinkTool
+	w.Tool = drawtool.LinkTool
 	w.linkFirst = nil
 }
 

pkg/uix/canvas_strokes.go

@@ -94,7 +94,7 @@ func (w *Canvas) presentStrokes(e render.Engine) {
 	w.drawStrokes(e, strokes)
 
 	// Dynamic actor links visible in the ActorTool and LinkTool.
-	if w.Tool == ActorTool || w.Tool == LinkTool {
+	if w.Tool == drawtool.ActorTool || w.Tool == drawtool.LinkTool {
 		w.presentActorLinks(e)
 	}
 }