examples/physics/apply_force/example.md

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tags: physics title: Apply force brief: This example demonstrates how to apply directional force to all dynamic blocks on touch/click and draws debug direction lines. thumbnail: thumbnail.png

scripts: apply_force.script

This example demonstrates how to apply directional force to all dynamic blocks on touch/click and draws debug direction lines.

Setup

Scene consists of a few game objects:

• controller
  • Main object that contains /example/apply_force.script and a label with usage text.
• block1, block2, block3, block4
  • Dynamic rigid bodies (sprite + dynamic collision object).
• walls
  • Static boundary collision object around the screen.

Proposed settings regarding physics in the game.project file:

Script flow

A single controller script handles input for the whole scene.
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.

1. acquires input focus in init()
2. listens to hash("touch") in on_input()
3. iterates over all block ids
4. computes force = (touch - center) * force_factor
5. posts apply_force to each block
6. posts @render: draw_line for debug visualization