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Added example on how to apply force to physics collision objects. (#147)
* Added example on how to apply force to physics collision objects. * Changed title of the example in game.project
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‎physics/apply_force/all.texture_profiles‎

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path_settings {
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path: "**"
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profile: "Default"
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}
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profiles {
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name: "Default"
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platforms {
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os: OS_ID_GENERIC
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formats {
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format: TEXTURE_FORMAT_RGBA
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compression_level: BEST
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compression_type: COMPRESSION_TYPE_DEFAULT
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}
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mipmaps: false
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max_texture_size: 0
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premultiply_alpha: true
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}
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}

‎physics/apply_force/assets/SourceSansPro-Semibold.ttf‎

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‎physics/apply_force/assets/images/elementMetal001.png‎

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‎physics/apply_force/assets/images/elementStone019.png‎

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‎physics/apply_force/assets/images/elementStone023.png‎

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‎physics/apply_force/assets/sprites.atlas‎

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images {
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image: "/assets/images/elementStone019.png"
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}
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images {
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image: "/assets/images/elementStone023.png"
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}
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images {
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image: "/assets/images/elementMetal001.png"
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}
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animations {
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id: "coin"
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playback: PLAYBACK_LOOP_FORWARD
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fps: 8
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}
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extrude_borders: 2

‎physics/apply_force/assets/text48.font‎

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font: "/assets/SourceSansPro-Semibold.ttf"
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material: "/builtins/fonts/font.material"
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size: 48
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outline_alpha: 0.0
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outline_width: 0.0

‎physics/apply_force/example.md‎

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---
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tags: physics
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title: Apply force
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brief: This example demonstrates how to apply directional force to all dynamic blocks on touch/click and draws debug direction lines.
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thumbnail: thumbnail.png
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scripts: apply_force.script
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---
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This example demonstrates how to apply directional force to all dynamic blocks on touch/click and draws debug direction lines.
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## Setup
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![setup](setup.png)
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Scene consists of a few game objects:
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- `controller`
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- Main object that contains `/example/apply_force.script` and a label with usage text.
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- `block1`, `block2`, `block3`, `block4`
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- Dynamic rigid bodies (sprite + dynamic collision object).
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- `walls`
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- Static boundary collision object around the screen.
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Proposed settings regarding physics in the `game.project` file:
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![gameproject](gameproject.png)
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## Script flow
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A single controller script handles input for the whole scene.
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When you touch/click, it loops over all dynamic blocks, computes a force vector for each one, applies the force, and draws a debug line that visualizes the direction.
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1. acquires input focus in `init()`
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2. listens to `hash("touch")` in `on_input()`
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3. iterates over all block ids
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4. computes `force = (touch - center) * force_factor`
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5. posts `apply_force` to each block
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6. posts `@render: draw_line` for debug visualization

‎physics/apply_force/example/apply_force.collection‎

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name: "default"
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scale_along_z: 0
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embedded_instances {
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id: "walls"
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data: "embedded_components {\n"
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" id: \"collisionobject\"\n"
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" type: \"collisionobject\"\n"
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" data: \"type: COLLISION_OBJECT_TYPE_STATIC\\n"
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"mass: 0.0\\n"
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"friction: 0.9\\n"
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"restitution: 0.1\\n"
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"group: \\\"default\\\"\\n"
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"mask: \\\"default\\\"\\n"
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"embedded_collision_shape {\\n"
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" shapes {\\n"
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" shape_type: TYPE_BOX\\n"
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" position {\\n"
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" x: -50.0\\n"
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" y: 360.0\\n"
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" }\\n"
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" rotation {\\n"
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" }\\n"
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" index: 0\\n"
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" count: 3\\n"
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" }\\n"
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" shapes {\\n"
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" shape_type: TYPE_BOX\\n"
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" position {\\n"
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" x: 770.0\\n"
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" y: 360.0\\n"
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" }\\n"
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" rotation {\\n"
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" }\\n"
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" index: 3\\n"
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" count: 3\\n"
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" }\\n"
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" shapes {\\n"
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" shape_type: TYPE_BOX\\n"
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" position {\\n"
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" x: 360.0\\n"
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" y: 770.0\\n"
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" }\\n"
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" rotation {\\n"
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" }\\n"
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" index: 6\\n"
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" count: 3\\n"
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" }\\n"
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" shapes {\\n"
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" shape_type: TYPE_BOX\\n"
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" position {\\n"
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" x: 360.0\\n"
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" y: -50.0\\n"
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" }\\n"
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" rotation {\\n"
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" }\\n"
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" index: 9\\n"
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" count: 3\\n"
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" }\\n"
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" data: 50.0\\n"
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" data: 360.0\\n"
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" data: 10.0\\n"
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" data: 50.0\\n"
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" data: 360.0\\n"
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" data: 10.0\\n"
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" data: 460.0\\n"
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" data: 50.0\\n"
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" data: 10.0\\n"
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" data: 460.0\\n"
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" data: 50.0\\n"
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" data: 10.0\\n"
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"}\\n"
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"\"\n"
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"}\n"
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""
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}
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embedded_instances {
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id: "block1"
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data: "embedded_components {\n"
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" id: \"collisionobject\"\n"
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" type: \"collisionobject\"\n"
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" data: \"type: COLLISION_OBJECT_TYPE_DYNAMIC\\n"
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"mass: 2.0\\n"
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"friction: 0.5\\n"
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"restitution: 0.2\\n"
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"group: \\\"default\\\"\\n"
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"mask: \\\"default\\\"\\n"
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"embedded_collision_shape {\\n"
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" shapes {\\n"
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" shape_type: TYPE_BOX\\n"
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" position {\\n"
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" }\\n"
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" rotation {\\n"
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" }\\n"
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" index: 0\\n"
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" count: 3\\n"
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" }\\n"
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" data: 109.4645\\n"
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" data: 68.3975\\n"
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" data: 10.0\\n"
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"}\\n"
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"linear_damping: 0.8\\n"
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"angular_damping: 0.8\\n"
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"event_collision: false\\n"
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"event_contact: false\\n"
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"event_trigger: false\\n"
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"\"\n"
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"}\n"
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"embedded_components {\n"
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" id: \"sprite\"\n"
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" type: \"sprite\"\n"
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" data: \"default_animation: \\\"elementStone019\\\"\\n"
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"material: \\\"/builtins/materials/sprite.material\\\"\\n"
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"textures {\\n"
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" sampler: \\\"texture_sampler\\\"\\n"
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" texture: \\\"/assets/sprites.atlas\\\"\\n"
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"}\\n"
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"\"\n"
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"}\n"
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""
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position {
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x: 220.14
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y: 559.457
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}
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}
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embedded_instances {
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id: "block2"
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data: "embedded_components {\n"
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" id: \"sprite\"\n"
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" type: \"sprite\"\n"
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" data: \"default_animation: \\\"elementStone023\\\"\\n"
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"material: \\\"/builtins/materials/sprite.material\\\"\\n"
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"textures {\\n"
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" sampler: \\\"texture_sampler\\\"\\n"
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" texture: \\\"/assets/sprites.atlas\\\"\\n"
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"}\\n"
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"\"\n"
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"}\n"
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"embedded_components {\n"
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" id: \"collisionobject\"\n"
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" type: \"collisionobject\"\n"
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" data: \"type: COLLISION_OBJECT_TYPE_DYNAMIC\\n"
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"mass: 1.0\\n"
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"friction: 0.5\\n"
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"restitution: 0.2\\n"
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"group: \\\"default\\\"\\n"
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"mask: \\\"default\\\"\\n"
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"embedded_collision_shape {\\n"
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" shapes {\\n"
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" shape_type: TYPE_BOX\\n"
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" position {\\n"
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" }\\n"
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" rotation {\\n"
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" }\\n"
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" index: 0\\n"
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" count: 3\\n"
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" }\\n"
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" data: 68.0\\n"
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" data: 68.3975\\n"
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" data: 10.0\\n"
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"}\\n"
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"linear_damping: 0.8\\n"
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"angular_damping: 0.8\\n"
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"event_collision: false\\n"
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"event_contact: false\\n"
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"event_trigger: false\\n"
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"\"\n"
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"}\n"
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""
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position {
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x: 385.289
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y: 385.021
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}
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}
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embedded_instances {
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id: "block3"
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data: "embedded_components {\n"
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" id: \"sprite\"\n"
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" type: \"sprite\"\n"
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" data: \"default_animation: \\\"elementStone023\\\"\\n"
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"material: \\\"/builtins/materials/sprite.material\\\"\\n"
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"size {\\n"
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" x: 140.0\\n"
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" y: 140.0\\n"
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"}\\n"
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"textures {\\n"
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" sampler: \\\"texture_sampler\\\"\\n"
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" texture: \\\"/assets/sprites.atlas\\\"\\n"
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"}\\n"
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"\"\n"
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"}\n"
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"embedded_components {\n"
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" id: \"collisionobject\"\n"
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" type: \"collisionobject\"\n"
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" data: \"type: COLLISION_OBJECT_TYPE_DYNAMIC\\n"
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"mass: 1.0\\n"
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"friction: 0.5\\n"
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"restitution: 0.2\\n"
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"group: \\\"default\\\"\\n"
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"mask: \\\"default\\\"\\n"
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"embedded_collision_shape {\\n"
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" shapes {\\n"
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" shape_type: TYPE_BOX\\n"
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" position {\\n"
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" }\\n"
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" rotation {\\n"
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" }\\n"
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" index: 0\\n"
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" count: 3\\n"
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" }\\n"
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" data: 68.0\\n"
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" data: 68.3975\\n"
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" data: 10.0\\n"
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"}\\n"
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"linear_damping: 0.8\\n"
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"angular_damping: 0.8\\n"
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"event_collision: false\\n"
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"event_contact: false\\n"
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"event_trigger: false\\n"
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"\"\n"
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"}\n"
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""
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position {
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x: 508.289
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y: 547.021
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}
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}
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embedded_instances {
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id: "block4"
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data: "embedded_components {\n"
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" id: \"sprite\"\n"
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" type: \"sprite\"\n"
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" data: \"default_animation: \\\"elementStone023\\\"\\n"
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"material: \\\"/builtins/materials/sprite.material\\\"\\n"
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"size {\\n"
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" x: 140.0\\n"
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" y: 140.0\\n"
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"}\\n"
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"textures {\\n"
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" sampler: \\\"texture_sampler\\\"\\n"
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" texture: \\\"/assets/sprites.atlas\\\"\\n"
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"}\\n"
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"\"\n"
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"}\n"
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"embedded_components {\n"
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" id: \"collisionobject\"\n"
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" type: \"collisionobject\"\n"
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" data: \"type: COLLISION_OBJECT_TYPE_DYNAMIC\\n"
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"mass: 1.0\\n"
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"friction: 0.5\\n"
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"restitution: 0.2\\n"
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"group: \\\"default\\\"\\n"
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"mask: \\\"default\\\"\\n"
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"embedded_collision_shape {\\n"
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" shapes {\\n"
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" shape_type: TYPE_BOX\\n"
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" position {\\n"
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" }\\n"
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" rotation {\\n"
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" }\\n"
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" index: 0\\n"
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" count: 3\\n"
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" }\\n"
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" data: 68.0\\n"
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" data: 68.3975\\n"
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" data: 10.0\\n"
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"}\\n"
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"linear_damping: 0.8\\n"
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"angular_damping: 0.8\\n"
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"event_collision: false\\n"
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"event_contact: false\\n"
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"event_trigger: false\\n"
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"\"\n"
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"}\n"
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""
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position {
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x: 608.289
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y: 395.021
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}
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}
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embedded_instances {
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id: "controller"
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data: "components {\n"
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" id: \"apply_force\"\n"
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" component: \"/example/apply_force.script\"\n"
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"}\n"
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"embedded_components {\n"
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" id: \"label\"\n"
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" type: \"label\"\n"
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" data: \"size {\\n"
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" x: 700.0\\n"
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" y: 50.0\\n"
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"}\\n"
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"color {\\n"
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" x: 0.101960786\\n"
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" y: 0.2\\n"
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" z: 0.6\\n"
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"}\\n"
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"text: \\\"Click to apply force to all blocks\\\"\\n"
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"font: \\\"/assets/text48.font\\\"\\n"
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"material: \\\"/builtins/fonts/label.material\\\"\\n"
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"\"\n"
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" position {\n"
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" x: 360.0\n"
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" y: 680.0\n"
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" }\n"
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" scale {\n"
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" x: 0.75\n"
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" y: 0.75\n"
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" }\n"
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"}\n"
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""
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}

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