com.alexvasilkov.gestures.utils

Class MathUtils

java.lang.Object

com.alexvasilkov.gestures.utils.MathUtils

public class MathUtils
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static void	computeNewPosition(float[] point, State initialState, State finalState)
static float	interpolate(float start, float end, float factor) Interpolates from start value to the end one by given factor (from 0 to 1).
static void	interpolate(android.graphics.RectF out, android.graphics.RectF start, android.graphics.RectF end, float factor) Interpolates from start rect to the end rect by given factor (from 0 to 1), storing result into out rect.
static void	interpolate(State out, State start, float startPivotX, float startPivotY, State end, float endPivotX, float endPivotY, float factor) Interpolates from start state to end state by given factor (from 0 to 1), storing result into out state.
static void	interpolate(State out, State start, State end, float factor) Interpolates from start state to end state by given factor (from 0 to 1), storing result into out state.
static float	restrict(float value, float minValue, float maxValue) Keeps value within provided bounds.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

restrict

public static float restrict(float value,
                             float minValue,
                             float maxValue)

Keeps value within provided bounds.

Parameters:

value - Value to be restricted

minValue - Min value

maxValue - Max value

Returns:

Restricted value

interpolate

public static float interpolate(float start,
                                float end,
                                float factor)

Interpolates from start value to the end one by given factor (from 0 to 1).

Parameters:

start - Start value

end - End value

factor - Factor

Returns:

Interpolated value

interpolate

public static void interpolate(android.graphics.RectF out,
                               android.graphics.RectF start,
                               android.graphics.RectF end,
                               float factor)

Interpolates from start rect to the end rect by given factor (from 0 to 1), storing result into out rect.

Parameters:

out - Interpolated rectangle (output)

start - Start rectangle

end - End rectangle

factor - Factor

interpolate

public static void interpolate(State out,
                               State start,
                               State end,
                               float factor)

Interpolates from start state to end state by given factor (from 0 to 1), storing result into out state.

Parameters:

out - Interpolated state (output)

start - Start state

end - End state

factor - Factor

interpolate

public static void interpolate(State out,
                               State start,
                               float startPivotX,
                               float startPivotY,
                               State end,
                               float endPivotX,
                               float endPivotY,
                               float factor)

Interpolates from start state to end state by given factor (from 0 to 1), storing result into out state. All operations (translation, zoom, rotation) will be performed within specified pivot points, assuming start and end pivot points represent same physical point on the image.

Parameters:

out - Interpolated state (output)

start - Start state

startPivotX - Pivot point's X coordinate in start state coordinates

startPivotY - Pivot point's Y coordinate in start state coordinates

end - End state

endPivotX - Pivot point's X coordinate in end state coordinates

endPivotY - Pivot point's Y coordinate in end state coordinates

factor - Factor

computeNewPosition

public static void computeNewPosition(float[] point,
                                      State initialState,
                                      State finalState)