package model;

import transforms.*;

public class CoonsGrid extends Solid {
    private final Solid guideGrid;
    private final Mat4 bicubicMat;

    public CoonsGrid(Solid guideGrid) {
        isEditable = false;
        this.guideGrid = guideGrid;
        this.bicubicMat = Cubic.COONS;
        recalc();
    }

    @Override
    public void recalc() {
        vertexBuffer.clear();
        indexBuffer.clear();
        Bicubic bicubic = new Bicubic(bicubicMat, guideGrid.getPoints());
        for (int i = 0; i <= 10; i++) {
            for (int j = 0; j <= 10; j++) {
                vertexBuffer.add(new Vertex(bicubic.compute(i / 10.0, j / 10.0), 0xff33ff));
            }
        }
        this.transMat = new Mat4Scale(3).mul(new Mat4Transl(-3, -3, 0)).mul(guideGrid.getTransMat());
        for (int i = 0; i <= 10; i++) {
            for (int j = 0; j <= 10; j++) {
                if (j > 0) {
                    indexBuffer.add(i * (11) + j - 1);
                    indexBuffer.add(i * (11) + j);
                }
                if (i > 0) {
                    indexBuffer.add((i - 1) * (11) + j);
                    indexBuffer.add(i * (11) + j);
                }

            }
        }
    }
}