Created
April 14, 2019 19:24
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| extends Camera2D | |
| var _duration = 0.0 | |
| var _period_in_ms = 0.0 | |
| var _amplitude = 0.0 | |
| var _timer = 0.0 | |
| var _last_shook_timer = 0 | |
| var _previous_x = 0.0 | |
| var _previous_y = 0.0 | |
| var _last_offset = Vector2(0, 0) | |
| func _ready(): | |
| set_process(true) | |
| # Shake with decreasing intensity while there's time remaining. | |
| func _process(delta): | |
| # Only shake when there's shake time remaining. | |
| if _timer == 0: | |
| return | |
| # Only shake on certain frames. | |
| _last_shook_timer = _last_shook_timer + delta | |
| # Be mathematically correct in the face of lag; usually only happens once. | |
| while _last_shook_timer >= _period_in_ms: | |
| _last_shook_timer = _last_shook_timer - _period_in_ms | |
| # Lerp between [amplitude] and 0.0 intensity based on remaining shake time. | |
| var intensity = _amplitude * (1 - ((_duration - _timer) / _duration)) | |
| # Noise calculation logic from http://jonny.morrill.me/blog/view/14 | |
| var new_x = rand_range(-1.0, 1.0) | |
| var x_component = intensity * (_previous_x + (delta * (new_x - _previous_x))) | |
| var new_y = rand_range(-1.0, 1.0) | |
| var y_component = intensity * (_previous_y + (delta * (new_y - _previous_y))) | |
| _previous_x = new_x | |
| _previous_y = new_y | |
| # Track how much we've moved the offset, as opposed to other effects. | |
| var new_offset = Vector2(x_component, y_component) | |
| set_offset(get_offset() - _last_offset + new_offset) | |
| _last_offset = new_offset | |
| # Reset the offset when we're done shaking. | |
| _timer = _timer - delta | |
| if _timer <= 0: | |
| _timer = 0 | |
| set_offset(get_offset() - _last_offset) | |
| # Kick off a new screenshake effect. | |
| func shake(duration, frequency, amplitude): | |
| # Initialize variables. | |
| _duration = duration | |
| _timer = duration | |
| _period_in_ms = 1.0 / frequency | |
| _amplitude = amplitude | |
| _previous_x = rand_range(-1.0, 1.0) | |
| _previous_y = rand_range(-1.0, 1.0) | |
| # Reset previous offset, if any. | |
| set_offset(get_offset() - _last_offset) | |
| _last_offset = Vector2(0, 0) |
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