controllerScale

Description

Performs a scaling animation of the element from its current scale to a new one. Amount of scaling on each axis is supplied by the parameters sx, sy and sz. The last performed transition is remembered and at any time during or after it you can order performing it backwards or repeat it.

Applies one scale transform.

Parameters

Visit page Controller # Common Parameters for documentation on the parameters, common to all controllers: id, paused and disabled.

Parameters of scale():

duration

Duration of the animation in milliseconds. Default value: 1000

sx, sy, sz

Scaling amount in each dimension. A value of 1 is the original size. Default values: 1, 1, 1

init_sx, init_sy, init_sz

Set initial scaling of the element. Note that the initial scaling will be applied immediately (when the controller is enabled), not waiting for the animation to be started with any of the start messages. Default values: 1, 1, 1

repeat_start_pos

If true, then every start or start_back message will start a forward/backwards animation from the direction's starting scaling. If false (by default), then sending these messages when an animation is already started will continue the current animation (if already moving in the same direction), or will start an animation in the opposite direction, but continuing from the current scaling. This parameter has no effect on the start_new or start_new_back messages, as they start a new animation from the current scaling in all cases. Default value: false

register_actions

Tells whether to handle the element's show, hide, show_immediately and hide_immediately actions.
Values: false / true / "500" (i.e. react with 500 milliseconds delay) / "500 elm" (i.e. set event handlers with delay 500ms for HTML element #elm's actions). Default value: false

half_step

If set to less than 1, each frame the current scaling factor will step closer to the required scaling factor, where step = half_step * distance_to_required_scaling. Values in the range (0 - 1) make sense. Default value: 1

spring_acc

If bigger than 0, the animated scaling factor will behave as if attached to a spring. Bigger values of spring_acc result in stronger pulling of the "spring" and faster motion (i.e. shorter spring period). Note that setting too high of a value will cause a self-amplifying spring motion of the animated scaling factor. What is the highest value before the positive feedback kicks in depends on the value of spring_vdamp, but values up to 2 are always safe. Default value: 0

spring_vdamp

When spring motion is enabled via parameter spring_acc, every frame the current speed of the spring is multiplied by this parameter, effectively slowing the spring motion. Values between 0 and 1 are reasonable, where smaller values result in faster dying of the spring motion and a value of 1 means absolute elasticity of the spring. Default value: 0.92

ease_type

What kind of 'easing' to be applied on the transition.
Currently supported values:

• "linear" - constant speed in all transition parts,
• "ease" - slower start and end of transition, elliptical shape,
• "ease_in" - slower start, fast and sudden end,
• "ease_out" - fast and sudden start, slow end.

Default value: "ease"

ease_amount

Strength of 'easing' to be applied on the transition.
Values in the range (0 - 1] make sense, though values greater than 1 (up to 2-3) can also be of use. Default value: 1

ease_mirror

Tells if the easing applied on 'backwards' transition is the same as the forward easing, or mirrored. If this parameter is set to true and parameter ease_type is "ease_in", then upon a backwards transition, "ease_out" easing will be applied. Default value: false

Accepted Messages

Visit page Controller # Common Messages for documentation on the messages, accepted by all controllers: pause, unpause, enable, disable, params and remove.

Message Parameters: Note that along the message parameters specific to each message type, every message (not only params) accepts as parameters any of the controller parameters, which are set before the message is executed.

Messages accepted by scale():

start

Starts a rotation from the current angle to the target angle. The message has no effect if already in the target angle or rotating towards it. If currently rotating in the 'backwards' direction (from the target to the starting angle, ordered with messages start_back and start_new_back), then the rotation direction will be switched to 'forwards' and the 'forward' rotation will continue from the current angle to the target angle. Message params: none

start_back

Starts a 'backwards' rotation from the current angle to the starting angle of the current forward rotation. The message has no effect if already in the starting angle or rotating towards it. Message params: none

start_reverse

Start rotating in the reverse direction within the current (or last) rotation. Message params: none

start_new

Same as the start message, but does not continue a current rotation. It always starts a new rotation from the current angle to the supplied target angle. Message params: none

start_new_back

Start the 'backwards' motion (i.e. starting from the target angle) of a new rotation. So, calling controller.message('start_new_back', {angle: 20}) will cause the element to jump 20 deegrees clockwise and then start rotating backwards to the current angle. Message params: none

pos0

Position the element in the starting angle of the current rotation immediately. Message params: none

pos1

Position the element in the target angle of the current rotation immediately. Message params: none

Generated Events

Visit page Controller # Common Events for documentation on the events, generated by all controllers: frame, remove, paused, unpaused enabled and disabled.

Events fired by scale():

start

Fired upon starting a (forward) rotation, as long as not already on the target angle. Event params: none

half

Fired upon reaching the middle of the current (forward) rotation. Event params: none

end

Fired upon reaching the end of the current (forward) rotation. Event params: none

cycle

When performing a rotation of an angle greater in absolute value than 360 degrees, this event is fired upon passing every 360 degrees (full turn) counting from the starting angle of the rotation. Event params: none

mark

If parameter marked_angle is supplied (i.e. is different than -1), then this event is fired upon every passing of this marked angle. The value of the angle is absolute, and not relative to the starting angle for the rotation. Event params: none

start_back

Fired upon start of 'backwards' rotation. Event params: none

half_back

Fired upon reaching the middle of the current 'backwards' rotation. Event params: none

end_back

Fired upon reaching the end of the current 'backwards' rotation. Event params: none

cycle_back

Same as the cycle event, but is fired when performing a 'backwards' rotation. Note that the event is fired on every passing of the starting angle of the current 'forward' rotation, not on every passing of 360 degrees counting from the start of the 'backwards' rotation. Event params: none

mark_back

Same as the mark event, but is fired when performing a 'backwards' rotation. Event params: none

pos0

Fired upon reaching the starting angle when rotating 'backwards', i.e. it is fired when end_back is fired. Event params: none

pos1

Fired upon reaching the target angle when rotating forward, i.e. it is fired when end is fired. Event params: none

Interaction with DOM

• Transforms: Applies one rotate transform.
• CSS: Works with any styling. Does not set any style properties.
• Events: Does not set event listeners.

Changes Log

1. Controller introduced in v.0.80

See Also