added apply_linear_impulse example

physics/apply_linear_impulse/example.md

@@ -0,0 +1,16 @@
+---
+tags: physics
+title: Apply Linear Impluse
+brief: This example demonstrates how to apply linear impluse to a dynamic cube on touch/click
+author: JuLongZhiLu(巨龙之路)
+scripts: cube.script
+thumbnail: thumbnail.png
+---
+
+The cube contains a dynamic collisionobject component. 
+
+![image](image.png)
+
+The below script applies a vertical linear impulse to the dynamic collisionobject on click/touch using the `b2d` API functions.
+
+Read more about the [Box2D API here](https://defold.com/ref/stable/b2d-lua/).

physics/apply_linear_impulse/fonts/text32.font

@@ -0,0 +1,5 @@
+font: "/fonts/SourceSansPro-Semibold.ttf"
+material: "/builtins/fonts/font-df.material"
+size: 32
+output_format: TYPE_DISTANCE_FIELD
+characters: " !\"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"

physics/apply_linear_impulse/game.project

@@ -0,0 +1,30 @@
+[bootstrap]
+main_collection = /scenes/main.collectionc
+
+[script]
+shared_state = 1
+
+[display]
+width = 960
+height = 640
+high_dpi = 1
+
+[android]
+input_method = HiddenInputField
+
+[physics]
+gravity_y = -1000.0
+scale = 0.01
+use_fixed_timestep = 1
+
+[html5]
+scale_mode = stretch
+
+[project]
+title = defold-apply_linear_impulse-example
+
+[render]
+clear_color_red = 0.160156
+clear_color_green = 0.164063
+clear_color_blue = 0.183594
+

physics/apply_linear_impulse/input/game.input_binding

@@ -0,0 +1,4 @@
+mouse_trigger {
+  input: MOUSE_BUTTON_1
+  action: "touch"
+}

physics/apply_linear_impulse/scenes/main.collection

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+name: "main"
+scale_along_z: 0
+embedded_instances {
+  id: "cube"
+  data: "components {\n"
+  "  id: \"cube\"\n"
+  "  component: \"/scripts/cube.script\"\n"
+  "}\n"
+  "embedded_components {\n"
+  "  id: \"sprite\"\n"
+  "  type: \"sprite\"\n"
+  "  data: \"default_animation: \\\"elementStone011\\\"\\n"
+  "material: \\\"/builtins/materials/sprite.material\\\"\\n"
+  "size {\\n"
+  "  x: 60.0\\n"
+  "  y: 60.0\\n"
+  "}\\n"
+  "size_mode: SIZE_MODE_MANUAL\\n"
+  "textures {\\n"
+  "  sampler: \\\"texture_sampler\\\"\\n"
+  "  texture: \\\"/textures/textures.atlas\\\"\\n"
+  "}\\n"
+  "\"\n"
+  "}\n"
+  "embedded_components {\n"
+  "  id: \"collisionobject\"\n"
+  "  type: \"collisionobject\"\n"
+  "  data: \"type: COLLISION_OBJECT_TYPE_DYNAMIC\\n"
+  "mass: 1.0\\n"
+  "friction: 0.1\\n"
+  "restitution: 0.5\\n"
+  "group: \\\"default\\\"\\n"
+  "mask: \\\"default\\\"\\n"
+  "embedded_collision_shape {\\n"
+  "  shapes {\\n"
+  "    shape_type: TYPE_BOX\\n"
+  "    position {\\n"
+  "    }\\n"
+  "    rotation {\\n"
+  "    }\\n"
+  "    index: 0\\n"
+  "    count: 3\\n"
+  "  }\\n"
+  "  data: 30.0\\n"
+  "  data: 30.0\\n"
+  "  data: 10.0\\n"
+  "}\\n"
+  "\"\n"
+  "}\n"
+  ""
+  position {
+    x: 480.0
+    y: 351.0
+  }
+}
+embedded_instances {
+  id: "platform"
+  data: "embedded_components {\n"
+  "  id: \"sprite\"\n"
+  "  type: \"sprite\"\n"
+  "  data: \"default_animation: \\\"elementStone013\\\"\\n"
+  "material: \\\"/builtins/materials/sprite.material\\\"\\n"
+  "slice9 {\\n"
+  "  x: 50.0\\n"
+  "  z: 50.0\\n"
+  "}\\n"
+  "size {\\n"
+  "  x: 400.0\\n"
+  "  y: 70.0\\n"
+  "}\\n"
+  "size_mode: SIZE_MODE_MANUAL\\n"
+  "textures {\\n"
+  "  sampler: \\\"texture_sampler\\\"\\n"
+  "  texture: \\\"/textures/textures.atlas\\\"\\n"
+  "}\\n"
+  "\"\n"
+  "}\n"
+  "embedded_components {\n"
+  "  id: \"collisionobject\"\n"
+  "  type: \"collisionobject\"\n"
+  "  data: \"type: COLLISION_OBJECT_TYPE_STATIC\\n"
+  "mass: 0.0\\n"
+  "friction: 0.1\\n"
+  "restitution: 0.5\\n"
+  "group: \\\"default\\\"\\n"
+  "mask: \\\"default\\\"\\n"
+  "embedded_collision_shape {\\n"
+  "  shapes {\\n"
+  "    shape_type: TYPE_BOX\\n"
+  "    position {\\n"
+  "    }\\n"
+  "    rotation {\\n"
+  "    }\\n"
+  "    index: 0\\n"
+  "    count: 3\\n"
+  "  }\\n"
+  "  data: 200.0\\n"
+  "  data: 35.0\\n"
+  "  data: 10.0\\n"
+  "}\\n"
+  "\"\n"
+  "}\n"
+  ""
+  position {
+    x: 480.0
+    y: 272.0
+  }
+}
+embedded_instances {
+  id: "label"
+  data: "embedded_components {\n"
+  "  id: \"label\"\n"
+  "  type: \"label\"\n"
+  "  data: \"size {\\n"
+  "  x: 128.0\\n"
+  "  y: 32.0\\n"
+  "}\\n"
+  "text: \\\"Click to apply linear impulse to the cube\\\"\\n"
+  "font: \\\"/fonts/text32.font\\\"\\n"
+  "material: \\\"/builtins/fonts/label-df.material\\\"\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 480.0\n"
+  "    y: 435.0\n"
+  "  }\n"
+  "}\n"
+  ""
+}

physics/apply_linear_impulse/scripts/cube.script

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+function init(self)
+	msg.post(".", "acquire_input_focus")
+end
+
+function on_input(self, action_id, action)
+	if action_id == hash("touch") and action.pressed then
+		-- get the b2body object
+		local body = b2d.get_body("#collisionobject")
+
+		-- add an impluse
+		local pos = b2d.body.get_position(body)
+		b2d.body.apply_linear_impulse(body, vmath.vector3(0,600,0), pos)
+	end
+end
+
+

physics/apply_linear_impulse/textures/textures.atlas

@@ -0,0 +1,10 @@
+images {
+  image: "/textures/pixel.png"
+}
+images {
+  image: "/textures/elementStone011.png"
+}
+images {
+  image: "/textures/elementStone013.png"
+}
+extrude_borders: 2