Merge branch 'master' into release/v4.0.0

examples/adventure/main.go

@@ -0,0 +1,255 @@
+package main
+
+import (
+	"fmt"
+	"image/color"
+	"math/rand"
+
+	"github.com/oakmound/oak/v4"
+	"github.com/oakmound/oak/v4/alg/floatgeom"
+	"github.com/oakmound/oak/v4/alg/intgeom"
+	"github.com/oakmound/oak/v4/collision"
+	"github.com/oakmound/oak/v4/entities"
+	"github.com/oakmound/oak/v4/event"
+	"github.com/oakmound/oak/v4/key"
+	"github.com/oakmound/oak/v4/render"
+	"github.com/oakmound/oak/v4/scene"
+)
+
+// Rooms exercises shifting the camera in a zelda-esque fashion,
+// moving the camera to center on even-sized rooms arranged in a grid
+// once the player enters them.
+
+func isOffScreen(ctx *scene.Context, char *entities.Entity) (intgeom.Dir2, bool) {
+	x := int(char.X())
+	y := int(char.Y())
+	if x > ctx.Window.Viewport().X()+ctx.Window.Bounds().X() {
+		return intgeom.Right, true
+	}
+	if y > ctx.Window.Viewport().Y()+ctx.Window.Bounds().Y() {
+		return intgeom.Down, true
+	}
+	if int(char.Right()) < ctx.Window.Viewport().X() {
+		return intgeom.Left, true
+	}
+	if int(char.Bottom()) < ctx.Window.Viewport().Y() {
+		return intgeom.Up, true
+	}
+	return intgeom.Dir2{}, false
+}
+
+const (
+	transitionFrameCount = 25
+)
+
+const (
+	LabelPlayer collision.Label = iota
+	LabelWall
+	LabelBox
+	LabelLock
+	LabelKey
+	LabelPot
+	LabelTreasure
+	LabelEnemy
+)
+
+func main() {
+
+	oak.AddScene("rooms", scene.Scene{Start: func(ctx *scene.Context) {
+		char := entities.New(ctx,
+			entities.WithRect(floatgeom.NewRect2WH(200, 200, 50, 50)),
+			entities.WithColor(color.RGBA{255, 255, 255, 255}),
+			entities.WithSpeed(floatgeom.Point2{5, 5}),
+			entities.WithDrawLayers([]int{1, 2}),
+		)
+		var transitioning bool
+		var totalTransitionDelta intgeom.Point2
+		var transitionDelta intgeom.Point2
+		event.Bind(ctx, event.Enter, char, func(c *entities.Entity, ev event.EnterPayload) event.Response {
+			if !transitioning {
+				dir, ok := isOffScreen(ctx, char)
+				if ok {
+					transitioning = true
+					totalTransitionDelta = ctx.Window.Bounds().Mul(intgeom.Point2{dir.X(), dir.Y()})
+					transitionDelta = totalTransitionDelta.DivConst(transitionFrameCount)
+				}
+			}
+			if transitioning {
+				// disable movement
+				// move camera one size towards the player
+				if totalTransitionDelta.X() != 0 || totalTransitionDelta.Y() != 0 {
+					oak.ShiftViewport(transitionDelta)
+					totalTransitionDelta = totalTransitionDelta.Sub(transitionDelta)
+				} else {
+					transitioning = false
+				}
+			} else {
+				char.Delta = floatgeom.Point2{}
+				if ctx.IsDown(key.W) {
+					char.Delta[1] -= char.Speed[1]
+				}
+				if ctx.IsDown(key.S) {
+					char.Delta[1] += char.Speed[1]
+				}
+				if ctx.IsDown(key.A) {
+					char.Delta[0] -= char.Speed[0]
+				}
+				if ctx.IsDown(key.D) {
+					char.Delta[0] += char.Speed[0]
+				}
+				char.Rect = char.Rect.Shift(char.Delta)
+
+				char.Tree.UpdateSpace(
+					char.X(), char.Y(), char.W(), char.H(), char.Space,
+				)
+				hitWall := false
+				hits := char.Tree.Hits(char.Space)
+				for _, h := range hits {
+					fmt.Println("hit label", h.Label)
+					switch h.Label {
+					case LabelWall:
+						if hitWall {
+							continue
+						}
+						hitWall = true
+						char.Delta = char.Delta.MulConst(-1)
+						char.Rect = char.Rect.Shift(char.Delta)
+						char.Tree.UpdateSpace(
+							char.X(), char.Y(), char.W(), char.H(), char.Space,
+						)
+					}
+				}
+				char.Renderable.SetPos(char.X(), char.Y())
+			}
+
+			return 0
+		})
+		const tileWidth = 50
+		const tileHeight = 50
+		tileDims := entities.WithDimensions(floatgeom.Point2{tileWidth, tileHeight})
+		x := 0.0
+		y := float64(-tileHeight) // to accommodate for initial newline
+		for _, rn := range board {
+			if rn == '\n' {
+				x = 0
+				y += tileHeight
+				continue
+			}
+			commonOpts := entities.And(
+				tileDims,
+				entities.WithPosition(floatgeom.Point2{x, y}),
+				entities.WithDrawLayers([]int{1}),
+			)
+			switch Tile(rn) {
+			case Wall:
+				entities.New(ctx, commonOpts,
+					entities.WithColor(color.RGBA{50, 50, 50, 255}),
+					entities.WithLabel(LabelWall),
+				)
+				x += tileWidth
+				continue
+			case Box:
+				entities.New(ctx, commonOpts,
+					tileDims,
+					entities.WithColor(color.RGBA{150, 150, 20, 255}),
+					entities.WithLabel(LabelBox),
+				)
+				// TODO
+			case Player:
+				fmt.Println("placing character at", x, y)
+				char.SetPos(floatgeom.Point2{x, y})
+			case Pot:
+				entities.New(ctx, commonOpts,
+					tileDims,
+					entities.WithColor(color.RGBA{100, 100, 100, 255}),
+					entities.WithLabel(LabelTreasure),
+				)
+				// TODO
+			case Enemy:
+				// TODO
+			case Treasure:
+				entities.New(ctx, commonOpts,
+					tileDims,
+					entities.WithColor(color.RGBA{255, 255, 0, 255}),
+					entities.WithLabel(LabelTreasure),
+				)
+			case Lock:
+				entities.New(ctx, commonOpts,
+					tileDims,
+					entities.WithColor(color.RGBA{200, 150, 0, 255}),
+					entities.WithLabel(LabelLock),
+				)
+			case Key:
+				entities.New(ctx, commonOpts,
+					tileDims,
+					entities.WithColor(color.RGBA{50, 50, 200, 255}),
+					entities.WithLabel(LabelKey),
+				)
+			case Empty:
+			}
+
+			// ground beneath moving objects
+			r := uint8(rand.Intn(20) + 40)
+			g := uint8(rand.Intn(80) + 60)
+			b := uint8(rand.Intn(10) + 30)
+			cb := render.NewColorBoxR(tileWidth, tileHeight, color.RGBA{r, g, b, 255})
+			cb.SetPos(float64(x), float64(y))
+			render.Draw(cb, 0)
+
+			x += tileWidth
+		}
+	}})
+
+	oak.Init("rooms", func(c oak.Config) (oak.Config, error) {
+		c.Screen.Width = 650
+		c.Screen.Height = 500
+		return c, nil
+	})
+}
+
+type Tile rune
+
+const (
+	Wall     Tile = 'W'
+	Empty    Tile = ' '
+	Box      Tile = 'B'
+	Enemy    Tile = 'E'
+	Player   Tile = 'C'
+	Pot      Tile = 'P'
+	Lock     Tile = 'L'
+	Key      Tile = 'K'
+	Treasure Tile = 'T'
+)
+
+const board = `
+WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
+W           WW                        WW           W
+W     C     WW                        WW           W
+W           WW                        WWW          W
+W                                     LLL        T W
+W                                     WWW          W
+W           WW                        WW           W
+W           WW                        WW           W
+W           WW                     P  WWWWWWWWWWWWWW
+WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW    WW           W
+WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW    WW       B   W
+W                        WW           WW      BKB  W
+W                        WW           WW  E    B   W
+W       WWWWWWWWWWW      WW    E      WW           W
+W           WW           WW           WW      E    W
+W           WW                        WW           W
+W           WW                        WW           W
+W           WW                                     W
+W           WW                                     W
+WWWWWW      WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
+WWWWWW      WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
+W                         B  B     P  WW           W
+W  P                      BB          WW    K      W
+W                         B  B    K   WW      E    W
+W                         BB       P  WW           W
+W           WWWWWWWWWWWWWWWWWWWWWWWWWWWW           W
+W                                     B        E   W
+W      E                              P    E       W
+W                                     B            W
+WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
+`