From 8685a3e37c45338747339794667f059164e8017f Mon Sep 17 00:00:00 2001
From: Trevor Slocum <trevor@rocketnine.space>
Date: Tue, 31 Jan 2023 17:29:47 -0800
Subject: [PATCH] Add crouching

---
 asset/image-source/player.aseprite | Bin 54648 -> 58580 bytes
 asset/image/player.png             | Bin 19526 -> 22446 bytes
 component/player.go                |  29 +++++++++++++++++++++++++++++
 game/game.go                       |  21 +++++++++++++++------
 go.mod                             |   4 ++--
 go.sum                             |   8 ++++----
 system/player.go                   |  13 ++++++++++++-
 system/ui.go                       |   3 +--
 8 files changed, 63 insertions(+), 15 deletions(-)

diff --git a/asset/image-source/player.aseprite b/asset/image-source/player.aseprite
index cc7b83649b1d1d9de3f5e15e57ac2421d65be800..6a13cab806756ac49a7fefc75779534b8219aebc 100644
GIT binary patch
delta 1857
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diff --git a/asset/image/player.png b/asset/image/player.png
index 4f9494d4e8cebeec4d6c41d7e7874cc4ecd84ebf..e76781bfd1b2a601f6332a6444866923d835b164 100644
GIT binary patch
delta 5265
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diff --git a/component/player.go b/component/player.go
index a6d3caf..55baf94 100644
--- a/component/player.go
+++ b/component/player.go
@@ -107,6 +107,9 @@ type Player struct {
 	WalkFrame        int
 	WalkFrameReverse bool
 
+	Crouching   bool
+	CrouchFrame int
+
 	NoPunch bool
 	NoKick  bool
 
@@ -145,3 +148,29 @@ var WalkFrames = []*ebiten.Image{
 	asset.FrameAt(asset.ImgPlayer, 6, 13),
 	asset.FrameAt(asset.ImgPlayer, 7, 13),
 }
+
+// CrouchFrames are defined in chronological order.
+var CrouchFrames = []*ebiten.Image{
+	asset.FrameAt(asset.ImgPlayer, 0, 14),
+	asset.FrameAt(asset.ImgPlayer, 1, 14),
+	asset.FrameAt(asset.ImgPlayer, 2, 14),
+	asset.FrameAt(asset.ImgPlayer, 3, 14),
+	asset.FrameAt(asset.ImgPlayer, 4, 14),
+	asset.FrameAt(asset.ImgPlayer, 5, 14),
+	asset.FrameAt(asset.ImgPlayer, 6, 14),
+	asset.FrameAt(asset.ImgPlayer, 7, 14),
+	asset.FrameAt(asset.ImgPlayer, 8, 14),
+	asset.FrameAt(asset.ImgPlayer, 9, 14),
+}
+
+// CrouchWalkFrames are defined in chronological order.
+var CrouchWalkFrames = []*ebiten.Image{
+	asset.FrameAt(asset.ImgPlayer, 0, 15),
+	asset.FrameAt(asset.ImgPlayer, 1, 15),
+	asset.FrameAt(asset.ImgPlayer, 2, 15),
+	asset.FrameAt(asset.ImgPlayer, 3, 15),
+	asset.FrameAt(asset.ImgPlayer, 4, 15),
+	asset.FrameAt(asset.ImgPlayer, 5, 15),
+	asset.FrameAt(asset.ImgPlayer, 6, 15),
+	asset.FrameAt(asset.ImgPlayer, 7, 15),
+}
diff --git a/game/game.go b/game/game.go
index d146d30..fc5d949 100644
--- a/game/game.go
+++ b/game/game.go
@@ -375,12 +375,20 @@ func (g *Game) UpdateByInputs(inputs []InputBits) {
 		}
 		_ = oppFlipped // TODO
 
-		playerRect := world.FloatRect(g.Players[i].X, g.Players[i].Y, g.Players[i].X+float64(component.PlayerSize), g.Players[i].Y+float64(component.PlayerSize))
 		oppRect := world.FloatRect(g.Players[opp].X, g.Players[opp].Y, g.Players[opp].X+float64(component.PlayerSize), g.Players[opp].Y+float64(component.PlayerSize))
 
 		g.Players[i].VX = g.Players[i].VX * 0.8
 		g.Players[i].VY = g.Players[i].VY * 0.8
 
+		// Advance crouching animation frame.
+		const crouchFrames = 10
+		if player.Crouching && player.CrouchFrame < crouchFrames-1 {
+			player.CrouchFrame++
+		} else if !player.Crouching && player.CrouchFrame != 0 {
+			player.CrouchFrame--
+		}
+
+		g.Players[i].Crouching = false
 		if g.Players[i].Action == component.ActionIdle {
 			if input.isButtonOn(ButtonBlock) {
 				g.Players[i].Action = component.ActionBlock
@@ -432,16 +440,17 @@ func (g *Game) UpdateByInputs(inputs []InputBits) {
 			if input.isButtonOn(ButtonUp) && g.Players[i].Grounded {
 				g.Players[i].VY = world.JumpVelocity
 			}
-			if input.isButtonOn(ButtonDown) && !component.TranslateRect(playerRect, 0, 1).Overlaps(oppRect) {
-				//g.Players[i].VY = -1
-				// TODO crouch
+			if input.isButtonOn(ButtonDown) {
+				g.Players[i].Crouching = true
 			}
-			if input.isButtonOn(ButtonLeft) && !component.TranslateRect(playerRect, -1, 0).Overlaps(oppRect) {
+			if input.isButtonOn(ButtonLeft) {
 				g.Players[i].VX = -1
 			}
-			if input.isButtonOn(ButtonRight) && !component.TranslateRect(playerRect, 1, 0).Overlaps(oppRect) {
+			if input.isButtonOn(ButtonRight) {
 				g.Players[i].VX = 1
 			}
+		} else {
+			g.Players[i].CrouchFrame = 0
 		}
 
 		// TODO player starts in idle action?
diff --git a/go.mod b/go.mod
index 8a65535..5609992 100644
--- a/go.mod
+++ b/go.mod
@@ -15,8 +15,8 @@ require (
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20221017161538-93cebf72946b // indirect
 	github.com/hajimehoshi/file2byteslice v1.0.0 // indirect
 	github.com/jezek/xgb v1.1.0 // indirect
-	golang.org/x/exp v0.0.0-20230129154200-a960b3787bd2 // indirect
-	golang.org/x/exp/shiny v0.0.0-20230129154200-a960b3787bd2 // indirect
+	golang.org/x/exp v0.0.0-20230131160201-f062dba9d201 // indirect
+	golang.org/x/exp/shiny v0.0.0-20230131160201-f062dba9d201 // indirect
 	golang.org/x/image v0.3.0 // indirect
 	golang.org/x/mobile v0.0.0-20221110043201-43a038452099 // indirect
 	golang.org/x/sys v0.4.0 // indirect
diff --git a/go.sum b/go.sum
index 8cb6b07..25d56c2 100644
--- a/go.sum
+++ b/go.sum
@@ -38,10 +38,10 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56/go.mod h1:JhuoJpWY28nO4Vef9tZUw9qufEGTyX1+7lmHxV5q5G4=
-golang.org/x/exp v0.0.0-20230129154200-a960b3787bd2 h1:5sPMf9HJXrvBWIamTw+rTST0bZ3Mho2n1p58M0+W99c=
-golang.org/x/exp v0.0.0-20230129154200-a960b3787bd2/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
-golang.org/x/exp/shiny v0.0.0-20230129154200-a960b3787bd2 h1:xiw7QDza+jS0x7vU7fwNbRSDE/QreNk9f9CZmXHs+Uw=
-golang.org/x/exp/shiny v0.0.0-20230129154200-a960b3787bd2/go.mod h1:UH99kUObWAZkDnWqppdQe5ZhPYESUw8I0zVV1uWBR+0=
+golang.org/x/exp v0.0.0-20230131160201-f062dba9d201 h1:BEABXpNXLEz0WxtA+6CQIz2xkg80e+1zrhWyMcq8VzE=
+golang.org/x/exp v0.0.0-20230131160201-f062dba9d201/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
+golang.org/x/exp/shiny v0.0.0-20230131160201-f062dba9d201 h1:Y5QA5ZjU4BIgfpTmSB+07A4sIMFk6nLx0Q0/mJlIduE=
+golang.org/x/exp/shiny v0.0.0-20230131160201-f062dba9d201/go.mod h1:UH99kUObWAZkDnWqppdQe5ZhPYESUw8I0zVV1uWBR+0=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/image v0.1.0/go.mod h1:iyPr49SD/G/TBxYVB/9RRtGUT5eNbo2u4NamWeQcD5c=
diff --git a/system/player.go b/system/player.go
index 552ddac..e9ca115 100644
--- a/system/player.go
+++ b/system/player.go
@@ -58,8 +58,19 @@ func (s *PlayerSystem) Draw(e gohan.Entity, screen *ebiten.Image) error {
 			break
 		}
 
+		drawCrouch := p.Crouching || (p.Action == component.ActionIdle && p.CrouchFrame != 0)
 		if p.Walking() {
-			sprite = component.WalkFrames[p.WalkFrame]
+			if drawCrouch {
+				if p.CrouchFrame == 9 {
+					sprite = component.CrouchWalkFrames[p.WalkFrame]
+				} else {
+					sprite = component.CrouchFrames[p.CrouchFrame]
+				}
+			} else {
+				sprite = component.WalkFrames[p.WalkFrame]
+			}
+		} else if drawCrouch {
+			sprite = component.CrouchFrames[p.CrouchFrame]
 		}
 
 		if sprite != nil {
diff --git a/system/ui.go b/system/ui.go
index 6a1bde6..15ec6ba 100644
--- a/system/ui.go
+++ b/system/ui.go
@@ -6,12 +6,11 @@ import (
 	"image/color"
 	"math"
 
-	"github.com/assemblaj/ggpo"
-
 	"code.rocketnine.space/tslocum/boxbrawl/component"
 	"code.rocketnine.space/tslocum/boxbrawl/world"
 	"code.rocketnine.space/tslocum/etk"
 	"code.rocketnine.space/tslocum/gohan"
+	"github.com/assemblaj/ggpo"
 	"github.com/hajimehoshi/ebiten/v2"
 	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
 	"github.com/hajimehoshi/ebiten/v2/inpututil"