Box2D Hello Box example

.github/workflows/check.yml

@@ -50,6 +50,7 @@ jobs:
 
           odin check arena_allocator $FLAGS
 
+          odin check box2d/hellobox $FLAGS
           odin check directx/d3d12_triangle_sdl2 -target:windows_amd64 $FLAGS
 
           odin check glfw/window $FLAGS

box2d/hello_box/hello_box.odin

@@ -0,0 +1,60 @@
+package hello_box
+
+import "core:fmt"
+import "vendor:box2d"
+
+// Translation of https://box2d.org/documentation/hello.html
+
+
+main :: proc() {
+
+	// Create World
+	world_def := box2d.DefaultWorldDef()
+	world_def.gravity = [2]f32{0.0,-10.0}
+	world_id := box2d.CreateWorld(world_def)
+
+	// Create Ground
+	ground_bodydef := box2d.DefaultBodyDef()
+	ground_bodydef.position = box2d.Vec2{0.0,-10.0}
+	ground_Id := box2d.CreateBody(world_id,ground_bodydef)
+
+	// Create Body 
+	ground_box := box2d.MakeBox(50.0,10.0)
+	ground_shape_def := box2d.DefaultShapeDef()
+	ground_polygon := box2d.CreatePolygonShape(ground_Id,ground_shape_def,ground_box)
+
+	// create dynamic body
+	body_def := box2d.DefaultBodyDef()
+	body_def.type = box2d.BodyType.dynamicBody
+	body_def.position = box2d.Vec2{0.0,4.0}
+	body_id := box2d.CreateBody(world_id,body_def)
+
+	dynamic_box := box2d.MakeBox(1.0,1.0)
+	shape_def := box2d.DefaultShapeDef()
+
+	// Reset friction and density
+	shape_def.density = 1.0
+	shape_def.material.friction = 0.3
+	shape_body:=box2d.CreatePolygonShape(body_id,shape_def,dynamic_box)
+
+	// simulation time step
+	time_step := 1.0/60.0
+	substep_count := 4
+
+	// Keep handles for potential use
+	// They are not needed explicitly, but the results will be wrong without them
+	_ = ground_polygon
+	_ = shape_body
+
+	// Simulation steps
+	for i:=0;i<90;i+=1 {
+		box2d.World_Step(world_id,f32(time_step),i32(substep_count))
+		pos := box2d.Body_GetPosition(body_id)
+		rot := box2d.Body_GetRotation(body_id)
+
+		fmt.printfln("%4.2f %4.2f %4.2f\n", pos.x, pos.y, box2d.Rot_GetAngle(rot))
+    }
+	// Delete World
+	box2d.DestroyWorld(world_id)
+
+}

box2d/hellobox.odin

@@ -0,0 +1,61 @@
+package hellobox
+
+import "core:fmt"
+import "vendor:box2d"
+
+// Translation of https://box2d.org/documentation/hello.html
+
+
+main :: proc() {
+
+	// Create World
+	world_def := box2d.DefaultWorldDef()
+	world_def.gravity = [2]f32{0.0,-10.0}
+	world_id := box2d.CreateWorld(world_def)
+
+	// Create Ground
+	ground_bodydef := box2d.DefaultBodyDef()
+	ground_bodydef.position = box2d.Vec2{0.0,-10.0}
+	ground_Id := box2d.CreateBody(world_id,ground_bodydef)
+	// Create Body 
+
+	ground_box := box2d.MakeBox(50.0,10.0)
+
+	ground_shape_def := box2d.DefaultShapeDef()
+	ground_polygon := box2d.CreatePolygonShape(ground_Id,ground_shape_def,ground_box)
+
+	// create dynamic body
+	body_def := box2d.DefaultBodyDef()
+	body_def.type = box2d.BodyType.dynamicBody
+	body_def.position = box2d.Vec2{0.0,4.0}
+	body_id := box2d.CreateBody(world_id,body_def)
+
+	dynamic_box := box2d.MakeBox(1.0,1.0)
+	shape_def := box2d.DefaultShapeDef()
+	// Reset friction and density
+	shape_def.density = 1.0
+	shape_def.material.friction = 0.3
+
+	shape_body:=box2d.CreatePolygonShape(body_id,shape_def,dynamic_box)
+
+	// simulation time step
+	time_step := 1.0/60.0
+
+	substep_count := 4
+
+	// Keep handles for potential use
+	// They are not needed explicitly, but the results will be wrong without them
+	_ = ground_polygon
+	_ = shape_body
+
+	// Simulation steps
+	for i:=0;i<90;i+=1 {
+		box2d.World_Step(world_id,f32(time_step),i32(substep_count))
+		pos := box2d.Body_GetPosition(body_id)
+		rot := box2d.Body_GetRotation(body_id)
+
+		fmt.printfln("%4.2f %4.2f %4.2f\n", pos.x, pos.y, box2d.Rot_GetAngle(rot))
+    }
+	box2d.DestroyWorld(world_id)
+
+}