Libgdx画圆控件

直接上代码：

package com.ef.smallstar.libgdx.widget;import android.content.res.Resources;import com.badlogic.gdx.graphics.Color;import com.badlogic.gdx.graphics.g2d.Batch;import com.badlogic.gdx.graphics.g2d.BitmapFont;import com.badlogic.gdx.graphics.g2d.TextureRegion;import com.badlogic.gdx.graphics.glutils.ShapeRenderer;import com.ef.smallstar.EFApplication;import com.ef.smallstar.R;import com.ef.smallstar.libgdx.base.BaseGdxActor;/** * Created by ext.danny.jiang on 17/4/17. * <p> * A Widget currently used in the UnitMap, shown as a CIRCLE shape * if text not null, there would be a text drawn in the center of the circle */public class GdxCircle extends BaseGdxActor {    private float centerX;    private float centerY;    private String text;    private float radius;    private ShapeRenderer sr;    private BitmapFont bitmapFont;    private int textWidth;    private int textHeight;    public GdxCircle(TextureRegion region) {        super(region);    }    public GdxCircle(float x, float y, float radius, BitmapFont bitmapFont) {        this(x, y, radius, null, bitmapFont);    }    public GdxCircle(float x, float y, float radius, String text, BitmapFont bitmapFont) {        this.centerX = x;        this.centerY = y;        this.radius = radius;        this.text = text;        //DANNY ADD:make the Actor's position the same as Circle which ShareRenderer has renderer        setPosition(centerX - radius, centerY - radius);        setSize(radius * 2, radius * 2);        Resources resources = EFApplication.getInstance().getResources();        sr = new ShapeRenderer();        sr.setColor(Color.valueOf(resources.getString(R.string.default_lesson_circle)));        this.bitmapFont = bitmapFont;    }    @Override    public void act(float delta) {        super.act(delta);    }    @Override    public void draw(Batch batch, float parentAlpha) {        super.draw(batch, parentAlpha);        if (sr != null) {            batch.end();            sr.setProjectionMatrix(batch.getProjectionMatrix());            sr.setTransformMatrix(batch.getTransformMatrix());            sr.begin(ShapeRenderer.ShapeType.Filled);            sr.circle(centerX, centerY, radius);            sr.end();            batch.begin();            if (text != null) {                textWidth = bitmapFont.getData().getGlyph(text.charAt(0)).width;                textHeight = bitmapFont.getData().getGlyph(text.charAt(0)).height;                bitmapFont.draw(batch, text, centerX - textWidth / 2, centerY + textHeight / 2);            }        }    }    public void setCircleColor(Color circleColor) {        if (sr != null) {            sr.setColor(circleColor);        }    }    public void setCenterPosition(float centerX, float centerY) {        this.centerX = centerX;        this.centerY = centerY;    }    public void setRadius(float radius) {        this.radius = radius;    }    public void setText(String text) {        this.text = text;    }    public String getText() {        return text;    }    public float getCenterX() {        return centerX;    }    public float getCenterY() {        return centerY;    }    public float getRadius() {        return radius;    }}

使用方法 直接添加到Stage中即可，如下所示：

GdxCircle circle = new GdxCircle();Stage stage = new Stage();stage.addActor(circle);