com.dgzt.core.shape.FilledCircleShape.java Source code

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Here is the source code for com.dgzt.core.shape.FilledCircleShape.java

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/*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.dgzt.core.shape;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;

/**
 * Circle shape.
 * 
 * @author Dgzt
 */
public class FilledCircleShape extends Shape {

    // --------------------------------------------------
    // ~ Private static members
    // --------------------------------------------------

    /** The number of vertices. */
    private static final int VERTICES_NUM = 362;

    // --------------------------------------------------
    // ~ Private members
    // --------------------------------------------------

    /** The radius value. */
    private float radius;

    // --------------------------------------------------
    // ~ Constructors
    // --------------------------------------------------

    /**
     * The constructor.
     * 
     * @param shader - The shader.
     * @param color - The color.
     */
    public FilledCircleShape(final ShaderProgram shader, final Color color) {
        super(shader, GL20.GL_TRIANGLE_FAN, FilledCircleShape.VERTICES_NUM, getIndices(), color);
    }

    // --------------------------------------------------
    // ~ Private methods
    // --------------------------------------------------

    /**
     * Return with the indices.
     */
    private static short[] getIndices() {
        final short[] indices = new short[FilledCircleShape.VERTICES_NUM];

        for (short i = 0; i < FilledCircleShape.VERTICES_NUM; ++i) {
            indices[i] = i;
        }

        return indices;
    }

    // --------------------------------------------------
    // ~ Public methods
    // --------------------------------------------------

    /**
     * Resize the shape.
     * 
     * @param x - The x coordinate value.
     * @param y - The y coordinate value.
     * @param radius - The radius value.
     */
    public void resize(final float x, final float y, final float radius) {
        this.radius = radius;

        final float[] vertices = new float[FilledCircleShape.VERTICES_NUM * Shape.POSITION_NUM];

        vertices[0] = x;
        vertices[1] = Gdx.graphics.getHeight() - y;
        for (int i = 0; i < FilledCircleShape.VERTICES_NUM - 1; ++i) {
            final float angle = (float) Math.toRadians(i);

            vertices[i * Shape.POSITION_NUM + 2] = x + (float) Math.sin(angle) * radius;
            vertices[i * Shape.POSITION_NUM + 3] = Gdx.graphics.getHeight()
                    - (y + (float) Math.cos(angle) * radius);
        }

        super.setVertices(vertices);
    }

    // --------------------------------------------------
    // ~ Getter methods
    // --------------------------------------------------

    /**
     * Return with the x coordinate value.
     */
    public final float getX() {
        return getVertices()[0];
    }

    /**
     * Return with the y coordinate value.
     */
    public final float getY() {
        return Gdx.graphics.getHeight() - getVertices()[1];
    }

    /**
     * Return with the radius value.
     */
    public final float getRadius() {
        return radius;
    }
}