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Refactors matrix handling in sprites

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This commit is contained in:
Viktor Lidholt 2015-08-03 16:04:27 -07:00
parent ffc33bbd68
commit 0aea22f7dc
1 changed files with 13 additions and 10 deletions
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23
sky/packages/sky/example/game/lib/node.dart
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@ -102,7 +102,7 @@ class Node {
void set rotation(double rotation) {
assert(rotation != null);
_rotation = rotation;
_invalidateTransformMatrix();
invalidateTransformMatrix();
}
/// The position of this node relative to its parent.
@ -113,7 +113,7 @@ class Node {
void set position(Point position) {
assert(position != null);
_position = position;
_invalidateTransformMatrix();
invalidateTransformMatrix();
}
/// The draw order of this node compared to its parent and its siblings.
@ -147,7 +147,7 @@ class Node {
void set scale(double scale) {
assert(scale != null);
_scaleX = _scaleY = scale;
_invalidateTransformMatrix();
invalidateTransformMatrix();
}
/// The horizontal scale of this node relative its parent.
@ -158,7 +158,7 @@ class Node {
void set scaleX(double scaleX) {
assert(scaleX != null);
_scaleX = scaleX;
_invalidateTransformMatrix();
invalidateTransformMatrix();
}
/// The vertical scale of this node relative its parent.
@ -169,7 +169,7 @@ class Node {
void set scaleY(double scaleY) {
assert(scaleY != null);
_scaleY = scaleY;
_invalidateTransformMatrix();
invalidateTransformMatrix();
}
/// A list of the children of this node.
@ -264,10 +264,13 @@ class Node {
///
/// Matrix4 matrix = myNode.transformMatrix;
Matrix4 get transformMatrix {
if (_transformMatrix != null) {
return _transformMatrix;
if (_transformMatrix == null) {
_transformMatrix = computeTransformMatrix();
}
return _transformMatrix;
}
Matrix4 computeTransformMatrix() {
double cx, sx, cy, sy;
if (_rotation == 0.0) {
@ -287,15 +290,15 @@ class Node {
}
// Create transformation matrix for scale, position and rotation
_transformMatrix = new Matrix4(cy * _scaleX, sy * _scaleX, 0.0, 0.0,
Matrix4 matrix = new Matrix4(cy * _scaleX, sy * _scaleX, 0.0, 0.0,
-sx * _scaleY, cx * _scaleY, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
_position.x, _position.y, 0.0, 1.0);
return _transformMatrix;
return matrix;
}
void _invalidateTransformMatrix() {
void invalidateTransformMatrix() {
_transformMatrix = null;
_invalidateToBoxTransformMatrix();
}