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Titanium.UI.Matrix2D
Extends Titanium.Proxy
The 2D Matrix is an object for holding values for an affine transformation matrix.
A 2D matrix is used to rotate, scale, translate, or skew the objects in a two-dimensional space. A 2D affine transformation can be represented by a 3 by 3 matrix:
| a | b | 0 |
| c | d | 0 |
| tx | ty | 1 |
The third column is constant (0,0,1).
On iOS, the matrix terms, a, b, c, d, tx, and ty,
are available as properties. On Android, the matrix terms are not available as properties.
Use the Titanium.UI.createMatrix2D method to create a new 2D matrix. You can pass an optional Matrix2DCreationDict dictionary to the method to initialize the matrix. For example, the following creates a new matrix with a 45 degree rotation.
var matrix = Ti.UI.createMatrix2D({
rotate: 45
});If you pass no arguments, createMatrix2D returns an identity matrix.
Examples
Apply a 2D Matrix to a Label
The following uses a 2D matrix to translate a label in the y direction.
var win = Ti.UI.createWindow();
var label = Ti.UI.createLabel({
font: { fontSize: 50 },
text: 'Titanium',
textAlign: 'center',
top: 100
});
win.add(label);
var button = Ti.UI.createButton({
title: 'Animate',
bottom: 20,
width: 200,
height: 40
});
win.add(button);
button.addEventListener('click', function() {
var t1 = Ti.UI.createMatrix2D();
t1 = t1.translate(0, 300);
var a1 = Ti.UI.createAnimation();
a1.transform = t1;
a1.duration = 800;
label.animate(a1);
});
win.open();Properties 9
The entry at position [1,1] in the matrix.
Inherited from Titanium.Proxy
The name of the API that this proxy corresponds to.
The entry at position [1,2] in the matrix.
Inherited from Titanium.Proxy
Indicates if the proxy will bubble an event to its parent.
Default: true
The entry at position [2,1] in the matrix.
The entry at position [2,2] in the matrix.
Inherited from Titanium.Proxy
The Window or TabGroup whose Activity lifecycle should be triggered on the proxy.
The entry at position [3,1] in the matrix.
The entry at position [3,2] in the matrix.
Methods 9
Inherited from Titanium.Proxy
Adds the specified callback as an event listener for the named event.
| Parameters | Type | Description |
|---|---|---|
| name | String | Name of the event. |
| callback | Callback<Titanium.Event> | Callback function to invoke when the event is fired. 4 fields
|
applyProperties
since 3.0.0Inherited from Titanium.Proxy
Applies the properties to the proxy.
| Parameters | Type | Description |
|---|---|---|
| props | Dictionary | A dictionary of properties to apply. |
Inherited from Titanium.Proxy
Fires a synthesized event to any registered listeners.
| Parameters | Type | Description |
|---|---|---|
| name | String | Name of the event. |
| event? | Dictionary | A dictionary of keys and values to add to the Titanium.Event object sent to the listeners. |
Returns a matrix constructed by inverting this matrix.
Returns a matrix constructed by combining two existing matrices.
The argument, t2 is concatenated to the matrix instance against which the function is invoked. The
resulting matrix is the result of multiplying this matrix by t2. You might perform several
multiplications in order to create a single matrix that contains the cumulative effects of
several transformations.
Note that matrix operations are not commutative -- the order in which you concatenate matrices
is important. That is, the result of multiplying matrix t1 by matrix t2 does not necessarily
equal the result of multiplying matrix t2 by matrix t1.
| Parameters | Type | Description |
|---|---|---|
| t2 | Titanium.UI.Matrix2D | The second matrix. |
Inherited from Titanium.Proxy
Removes the specified callback as an event listener for the named event.
| Parameters | Type | Description |
|---|---|---|
| name | String | Name of the event. |
| callback | Callback<Titanium.Event> | Callback function to remove. Must be the same function passed to 4 fields
|
Returns a matrix constructed by rotating this matrix.
There are two distinct versions of this method, depending on whether one argument or two are specified.
rotate(angle). The standardrotatemethod.rotate(fromAngle, toAngle). Android only. Used for specifying rotation animations.
In both cases, a positive value specifies clockwise rotation and a negative value specifies counter-clockwise rotation.
Details for each version are discussed below.
rotate(angle)
Returns a matrix constructed by rotating this matrix.
Note that the resulting matrix only expresses the final transformation, not the
direction of the rotation. For example, the matrix produced by m1.rotate(-10)
is identical to the matrix produced by m1.rotate(350) and m1.rotate(710).
Note that if you specify a rotation matrix as the transform property of an
animation, the animation animates the view from its current rotation to the
rotation represented by the matrix by its shortest path. So to rotate a view
in a complete circle, the easiest method is to chain together three animations,
rotating 120 degrees each time.
For the purposes of animation, it should be noted that the rotation angle is normalized to the range -180 <= angle < 180. In other words, an angle of 180 degrees is normalized to -180. This makes no difference except when determining which direction an animation rotates. 179 degrees rotates rotate clockwise, but 180 degrees is normalized to -180, so rotates counter-clockwise.
rotate(angle, toAngle) -- Android Only
This is an Android-specific method used for creating rotation animations.
Returns a Matrix2D object that represents a rotation from angle to toAngle.
Angles are specified in degrees. Positive values represent clockwise rotation, and negative values represent counter-clockwise rotation. Values are not normalized, so for example an angle of 720 degrees represents two complete clockwise revolutions.
The resulting object cannot be expressed as an affine transform, but can be used with the Titanium.UI.Animation.transform property to specify a rotation animation.
| Parameters | Type | Description |
|---|---|---|
| angle | Number | Angle to rotate to, in degrees. On Android, if |
| toAngle? | Number | Ending angle for a rotation animation, in degrees. Android only. |
Returns a Matrix2D object that specifies a scaling animation from one scale to another.
There are two distinct versions of this method, depending on whether two arguments or four are specified.
scale(sx, sy). The standardscalemethod.scale(fromSx, fromSy, toSx, toSy). Android only. Used for specifying a scaling animation from one size to another.
scale(sx, sy)
Returns a matrix constructed by applying a scale transform to this matrix.
Scaling the current matrix by sx along the X axis and by sy along the Y axis.
scale(sx, sy, toSx, toSy) -- Android Only
This Android-specific method returns a Matrix2D object that can be used to
create a scaling animation from one scale factor to another scale factor.
The resulting object cannot be expressed as an affine transform, but can be used with the Titanium.UI.Animation.transform property to specify a scaling animation.
| Parameters | Type | Description |
|---|---|---|
| sx | Number | Horizontal scaling factor. If |
| sy | Number | Vertical scaling factor. If |
| toSx? | Number | Ending horizontal scaling factor, at the end of an animation.
If specified, |
| toSy? | Number | Ending vertical scaling factor, at the end of an animation.
If specified, |
Returns a matrix constructed by applying a translation transform to this matrix.
| Parameters | Type | Description |
|---|---|---|
| tx | Number | Horizontal component of the translation. |
| ty | Number | Vertical component of the translation. |