transformVertex function
void
transformVertex()
Implementation
void transformVertex(vertexPosition, Vector3 mvPosition, Vector2 center, scale,
double? sin, double? cos) {
// compute position in camera space
//print("vooot"+vertexPosition.toString());
var vertexPosition2= Vector2(vertexPosition.x, vertexPosition.y);
var scale2= Vector2(scale.x, scale.y);
_alignedPosition
.subVectors(vertexPosition2, center)
.addScalar(0.5)
.multiply(scale2);
// to check if rotation is not zero
if (sin != null && cos != null) {
_rotatedPosition.x =
(cos * _alignedPosition.x) - (sin * _alignedPosition.y);
_rotatedPosition.y =
(sin * _alignedPosition.x) + (cos * _alignedPosition.y);
} else {
_rotatedPosition.copy(_alignedPosition);
}
vertexPosition.copy(mvPosition);
vertexPosition.x += _rotatedPosition.x;
vertexPosition.y += _rotatedPosition.y;
// transform to world space
vertexPosition.applyMatrix4(_viewWorldMatrix);
}