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package com.android.svg.support.model;


import com.android.svg.support.utils.Matrix;

import java.util.ArrayList;
import java.util.List;

/**
 * The group element model in the vector xml.
 *
 * @author Megatron King
 * @since 2016/8/31 20:42
 */
public class Group {

    public Group(Group parentGroup) {
        this.parentGroup = parentGroup;
    }

    public String name;

    public float pivotX;
    public float pivotY;

    public float scaleX = 1.0f;
    public float scaleY = 1.0f;

    public float rotation;

    public float translateX;
    public float translateY;

    public List children = new ArrayList<>();

    public Group parentGroup;

    public Matrix getMatrix() {
        // Calculate current group's matrix by preConcat the parent's and
        // and the current one on the top of the stack.
        // Basically the Mfinal = Mviewport * M0 * M1 * M2;
        // Mi the local matrix at level i of the group tree.
        Matrix local = new Matrix();
        local.postTranslate(-pivotX, -pivotY);
        local.postScale(scaleX, scaleY);
        local.postRotate(rotation, 0, 0);
        local.postTranslate(translateX + pivotX, translateY + pivotY);
        if (parentGroup != null) {
            Matrix matrix = parentGroup.getMatrix();
            matrix.preConcat(local);
            return matrix;
        }
        return local;
    }
}
 















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