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资源说明：Functions for drawing time-based curves.
#Tween Tween uses the core jQuery animate function to create arbitrary animations beyond animating CSS properties. Instead of taking a list of properties to animate, tween expects a callback function to executed on each step of the animation. ###.tween(step, [duration,] [easing,] [complete]) **step** - A function to be called after each step of the animation. **duration** - A string or number determining how long the animation will run. **easing** - A string indicating which easing function to use for the transition. **complete** - A function to call once the animation is complete. ###.tween(step, options ) **step** - A function to be called after each step of the animation. **options** - A map of additional options to pass to the method. Supported keys: *duration:* A string or number determining how long the animation will run. *easing:* A string indicating which easing function to use for the transition. *complete:* A function to call once the animation is complete. *step:* A function to be called after each step of the animation. *queue:* A Boolean indicating whether to place the animation in the effects queue. If false, the animation will begin immediately. *specialEasing:* A map of one or more of the CSS properties defined by the properties argument and their corresponding easing functions. #Curve Curve defines functions for creating curves as a function of time ###$.curve.circle(t, [options]) **t** - A number representing a percentage of time. **options** - A map of additional options to pass to the method. Supported keys: *x:* A number, in pixels, the center point of the circle on the x-axis. *y:* A number, in pixels, the center point of the circle on the y-axis. *radius:* A number, in pixels, the radius of the circle. *phase:* A number, in degrees, to shift the angle. *angle:* A number, in degrees, to rotate the circle around the center. *arc:* A number, in degrees, to determine portion of the circle to draw. Default: 360 *invert:* A boolean, flips the y-axis. *tangent:* A boolean, include the tangent angle. ###$.curve.ellipse(t, [options]) **t** - A number representing a percentage of time. **options** - A map of additional options to pass to the method. Supported keys: *x:* A number, in pixels, the center point of the ellipse on the x-axis. *y:* A number, in pixels, the center point of the ellipse on the y-axis. *major:* A number, in pixels, the major radius of the ellipse. *minor:* A number, in pixels, the minor radius of the ellipse. *phase:* A number, in degrees, to shift the angle. *angle:* A number, in degrees, to rotate the circle around the center. *arc:* A number, in degrees, to determine portion of the circle to draw. Default: 360 *invert:* A boolean, flips the y-axis. *tangent:* A boolean, include the tangent angle. ###$.curve.sine(t, [options]) **t** - A number representing a percentage of time. **options** - A map of additional options to pass to the method. Supported keys: *x:* A number, in pixels, the start point of the wave on the x-axis. *y:* A number, in pixels, the start point of the wave on the y-axis. *amp:* A number, in pixels, the peak deviation of the wave. *phase:* A number, in degrees, to shift the angle. *frequency:* A number of peaks in one period of the wave. *angle:* A number, in degrees, to rotate the wave around the start point. *arc:* A number, in degrees, to determine portion of the wave to draw. Default: 360 *invert:* A boolean, flips the y-axis. *tangent:* A boolean, include the tangent angle. ###$.curve.bezier(t, [options]) **t** - A number representing a percentage of time. **options** - A map of additional options to pass to the method. Supported keys: *x:* A number, in pixels, the start point of the curve on the x-axis. *y:* A number, in pixels, the start point of the curve on the y-axis. *points:* An array of x and y coordinates for the bezier curve. Minimum 2 points required. *angle:* A number, in degrees, to rotate the curve around the start point. *invert:* A boolean, flips the y-axis. *tangent:* A boolean, include the tangent angle.
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