From 8dd5eff733e01df2728b270790acbace01435a91 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Tue, 16 Aug 2022 19:25:53 +0200
Subject: Implemented the jump command

---
 src/brothers.zig | 17 +++++++++++++++++
 src/game.zig     |  3 +++
 src/main.zig     |  2 ++
 3 files changed, 22 insertions(+)

diff --git a/src/brothers.zig b/src/brothers.zig
index cf78988..1b34a6b 100644
--- a/src/brothers.zig
+++ b/src/brothers.zig
@@ -28,6 +28,11 @@ pub const Brother = struct {
             _ = try rc.buffer.writer().write(line);
         }
     }
+    pub fn moveJump(self: *Brother) void {
+        if (self.dy == 0) { // no double jumps! TODO allow kicks off the wall
+            self.dy -= 4 / (1000 / 60.0);
+        }
+    }
     pub fn moveLeft(self: *Brother) void {
         self.dx -= 5 / (1000 / 60.0);
         self.moveDuration = 24;
@@ -37,6 +42,7 @@ pub const Brother = struct {
         self.moveDuration = 24;
     }
     pub fn step(self: *Brother) void {
+        // Horizontal movement
         const x = self.x + self.dx;
         const ll = leftLimit[@enumToInt(self.side)];
         const rl = rightLimit[@enumToInt(self.side)];
@@ -57,6 +63,17 @@ pub const Brother = struct {
                 }
             }
         }
+        // Vertical movement
+        const y = self.y + self.dy;
+        if (y < 12) { // jumping
+            self.y = 12;
+            self.dy = -self.dy;
+        } else if (y > 17) { // falling
+            self.y = 17;
+            self.dy = 0;
+        } else {
+            self.y = y;
+        }
     }
     pub fn reset(self: *Brother, side: ?Side) void {
         if (side) |s| {
diff --git a/src/game.zig b/src/game.zig
index 97c2c80..ddd0b62 100644
--- a/src/game.zig
+++ b/src/game.zig
@@ -12,6 +12,9 @@ pub const Game = struct {
         try self.brothers[0].draw(rc);
         try self.brothers[1].draw(rc);
     }
+    pub fn moveJump(self: *Game) void {
+        self.brothers[@enumToInt(self.side)].moveJump();
+    }
     pub fn moveLeft(self: *Game) void {
         self.brothers[@enumToInt(self.side)].moveLeft();
     }
diff --git a/src/main.zig b/src/main.zig
index 120e926..3a534b9 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -53,6 +53,8 @@ pub fn main() !void {
                     gs.moveLeft();
                 } else if (in.eqlDescription("arrow-right") or in.eqlDescription("d")) {
                     gs.moveRight();
+                } else if (in.eqlDescription("arrow-up") or in.eqlDescription("space")) {
+                    gs.moveJump();
                 }
             }
         } else {
-- 
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