all the math how to create Matrix from the model

MatrixMath.java

// calculate params
float topLeftX = layer.getX() * canvasWidth;
float topLeftY = layer.getY() * canvasHeight;
// center - for rotation
float centerX = topLeftX + getWidth() * holyScale * 0.5F;
float centerY = topLeftY + getHeight() * holyScale * 0.5F;

float rotationInDegree = layer.getRotationInDegrees();
float scaleX = layer.getScale();
float scaleY = layer.getScale();

// applying transformations : L = S * R * T

// scale
matrix.preScale(scaleX, scaleY, centerX, centerY);

// rotate
matrix.preRotate(rotationInDegree, centerX, centerY);

// translate
matrix.preTranslate(topLeftX, topLeftY);

// applying holy scale - S`, the result will be : L = S * R * T * S`
matrix.preScale(holyScale, holyScale);