Android Open Source - gameroots Circle Joystick Renderer

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License

The source code is released under:

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUC...

Java Source Code

/*******************************************************************************
 * Copyright 2013 See AUTHORS file.// ww  w .j av a 2 s . c  o  m
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 ******************************************************************************/

package de.voodoosoft.gameroots.client.gdx.view.input.impl;

import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
import com.badlogic.gdx.math.Circle;
import com.badlogic.gdx.math.Vector2;

import de.voodoosoft.gameroots.client.gdx.view.input.IVirtualJoystickRenderer;
import de.voodoosoft.gameroots.client.gdx.view.input.VirtualJoystick;



/**
 * Simple joystick renderer which paints both the joystick and its knob as circles.
 * <p>
 * The knob can either be drawn at the touch position or at the snap position.
 * 
 * @see #setDrawSnappedKnob(boolean)
 * @see VirtualJoystick#setPositionCount(int)
 */
public class CircleJoystickRenderer implements IVirtualJoystickRenderer {

  /**
   * Creates new <code>CircleJoystickRenderer</code> for usage with the given <code>ShapeRenderer</code>.
   * <p>
   * The <code>ShapeRenderer</code> must be disposed externally.
   * 
   * @param shapeRenderer
   */
  public CircleJoystickRenderer(ShapeRenderer shapeRenderer) {
    this.shapeRenderer = shapeRenderer;
    knobRadius = 10;
    centerRadius = 3;
  }

  /**
   * Decides whether to draw the knob at the touch or at the snapped position.
   * 
   * @param drawSnappedKnob true to draw snap position
   */
  public void setDrawSnappedKnob(boolean drawSnappedKnob) {
    this.drawSnappedKnob = drawSnappedKnob;
  }

  /**
   * Specifies the knob size by setting its radius.
   * 
   * @param knobRadius radius
   */
  public void setKnobRadius(float knobRadius) {
    this.knobRadius = knobRadius;
  }

  /**
   * Specifies the radius of the drawn joystick center.
   * 
   * @param centerRadius radius
   */
  public void setCenterRadius(float centerRadius) {
    this.centerRadius = centerRadius;
  }

  /**
   * Sets color for the joystick circle.
   * 
   * @param boundsColor
   */
  public void setBoundsColor(Color boundsColor) {
    this.boundsColor = boundsColor;
  }

  /**
   * Sets color of the joystick knob.
   * 
   * @param knobColor
   */
  public void setKnobColor(Color knobColor) {
    this.knobColor = knobColor;
  }

  @Override
  public void paint(Circle circle, Vector2 knobDirection, float knobX, float knobY) {
    shapeRenderer.begin(ShapeType.Line);

    // draw outer circle
    shapeRenderer.setColor(boundsColor);
    shapeRenderer.circle(circle.x, circle.y, circle.radius);

    // draw center
    shapeRenderer.setColor(knobColor);
    if (centerRadius > 0) {
      shapeRenderer.circle(circle.x, circle.y, centerRadius);
    }

    shapeRenderer.end();

    // draw knob
    shapeRenderer.begin(ShapeType.Filled);
    if (drawSnappedKnob) {
      float x = circle.x + knobDirection.x * circle.radius;
      float y = circle.y + knobDirection.y * circle.radius;
      shapeRenderer.circle(x, y, knobRadius);
    }
    else {
      shapeRenderer.circle(knobX, knobY, knobRadius);
    }
    shapeRenderer.end();
  }

  private ShapeRenderer shapeRenderer;
  private boolean drawSnappedKnob;
  private Color boundsColor;
  private Color knobColor;
  private float knobRadius;
  private float centerRadius;
}

Java Source Code List

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