whee, now you can jump!

GitOrigin-RevId: e8c408b0ff

Jumpy.Shared/Player.cs

@@ -6,27 +6,41 @@ using System;
 namespace Jumpy {
   class Player {
     enum Facing { Left, Right };
-    enum Pose { Walking, Standing, Crouching, Stretching, SwordSwing };
+    enum Pose { Walking, Standing, Crouching, Stretching, SwordSwing, Jumping };
+    enum AirState { Jumping, Ground };
 
     private const int spriteSize = 144;
     private const int spriteWidth = 20;
     private const int moveSpeed = 600;
+    private const int jumpSpeed = 1800;
+    private const int gravity = 6000;
     private Texture2D texture;
 
     // TODO: stop assuming 1920x1080.
-    private Vector2 position = new Vector2(200, 1080 - spriteSize / 2);
+    private const int groundLevel = 1080 - spriteSize / 2;
+    private Vector2 position = new Vector2(200, groundLevel);
     private Facing facing = Facing.Right;
     private Pose pose = Pose.Standing;
+    private AirState airState = AirState.Ground;
     private double swordSwingTime = 0;
+    private double jumpTime = 0;
+    private double ySpeed = 0;
 
     public Player(Texture2D texture) {
       this.texture = texture;
     }
 
     public void Update(GameTime gameTime, GamePadState gamePad) {
+      if (gamePad.Buttons.A == ButtonState.Pressed && airState == AirState.Ground) {
+        pose = Pose.Jumping;
+        airState = AirState.Jumping;
+        jumpTime = 0.5;
+        ySpeed = -jumpSpeed;
+        return;
+      }
       if (gamePad.Buttons.X == ButtonState.Pressed && swordSwingTime <= 0) {
-        swordSwingTime = 0.3;
         pose = Pose.SwordSwing;
+        swordSwingTime = 0.3;
         return;
       }
       Vector2 leftStick = gamePad.ThumbSticks.Left;
@@ -46,11 +60,27 @@ namespace Jumpy {
         pose = Pose.Standing;
       }
 
+      if (jumpTime > 0) {
+        jumpTime -= gameTime.ElapsedGameTime.TotalSeconds;
+      }
       if (swordSwingTime > 0) {
         swordSwingTime -= gameTime.ElapsedGameTime.TotalSeconds;
         pose = Pose.SwordSwing;
       }
 
+      if (airState == AirState.Jumping) {
+        position.Y += (float)(ySpeed * gameTime.ElapsedGameTime.TotalSeconds);
+        ySpeed += gravity * (float)gameTime.ElapsedGameTime.TotalSeconds;
+        if (position.Y > groundLevel) {
+          position.Y = groundLevel;
+          ySpeed = 0;
+          airState = AirState.Ground;
+        }
+      }
+      if (airState == AirState.Jumping && pose != Pose.SwordSwing) {
+        pose = Pose.Jumping;
+      }
+   
       position.X = Math.Min(Math.Max(position.X, 0 + spriteWidth), 1920 - spriteWidth);
     }
 
@@ -66,6 +96,14 @@ namespace Jumpy {
           return new Point(spriteSize * 7, spriteSize * 2);
         case Pose.Stretching:
           return new Point(spriteSize * 1, spriteSize * 2);
+        case Pose.Jumping:
+          if (jumpTime > 0.25) {
+            return new Point(spriteSize * 6, spriteSize);
+          } else if (jumpTime > 0) {
+            return new Point(spriteSize * 7, spriteSize);
+          } else {
+            return new Point(spriteSize * 8, spriteSize);
+          }
         case Pose.SwordSwing:
           if (swordSwingTime > 0.2) {
             return new Point(spriteSize * 3, 0);