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Adds skew property to sprite node

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This commit is contained in:
Viktor Lidholt 2015-08-07 10:05:24 -07:00
parent e691a63e14
commit b636d54ebb
1 changed files with 28 additions and 0 deletions
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28
packages/flutter/example/game/lib/node.dart
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@ -30,6 +30,9 @@ class Node {
double _scaleX = 1.0;
double _scaleY = 1.0;
double _skewX = 0.0;
double _skewY = 0.0;
/// The visibility of this node and its children.
bool visible = true;
@ -116,6 +119,22 @@ class Node {
invalidateTransformMatrix();
}
double get skewX => _skewX;
void set skewX (double skewX) {
assert(skewX != null);
_skewX = skewX;
invalidateTransformMatrix();
}
double get skewY => _skewY;
void set skewY (double skewY) {
assert(skewY != null);
_skewY = skewY;
invalidateTransformMatrix();
}
/// The draw order of this node compared to its parent and its siblings.
///
/// By default nodes are drawn in the order that they have been added to a parent. To override this behavior the
@ -295,6 +314,15 @@ class Node {
0.0, 0.0, 1.0, 0.0,
_position.x, _position.y, 0.0, 1.0);
if (_skewX != 0.0 || _skewY != 0.0) {
// Needs skew transform
Matrix4 skew = new Matrix4(1.0, math.tan(radians(_skewX)), 0.0, 0.0,
math.tan(radians(_skewY)), 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0);
matrix.multiply(skew);
}
return matrix;
}