libgdx学习记录13——矩形CD进度条绘制

利用ShapeRenderer可进行矩形进度条的绘制，多变形的填充等操作。

这是根据角度获取矩形坐标的函数。

     public Vector2 GetPoint( float x, float y, float w, float h, float angle ){
         Vector2 point = new Vector2();
         while( angle >= 360 ){
             angle -= 360;
         }
         while( angle < 0 ){
             angle += 360;
         }

         System.out.println( GetAtan( h/w ) );

         if( angle>=0 && angle<GetAtan( h/w ) || angle>=360-GetAtan( h/w ) && angle<360 ){
             point.x = x+w;
             point.y = y+w*Change( angle );
         }
         else if( angle>=GetAtan( h/w ) && angle<180-GetAtan( h/w ) ){
             point.x = x+h*Change( 90-angle );
             point.y = y+h;
         }
         else if( angle>=180-GetAtan( h/w ) && angle<180+GetAtan( h/w ) ){
             point.x = x-w;
             point.y = y-w*Change( angle );
         }
         else if( angle>=180+GetAtan( h/w ) && angle<360-GetAtan( h/w ) ){
             point.x = x-h*Change( 90-angle );
             point.y = y-h;
         }

         return point;
     }

画部分矩形

     public void FillPartRect( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color  )
     {
         rend.begin( ShapeType.Line );
         rend.setColor( color );
         rend.rect( x-w, y-h, 2*w, 2*h );
         rend.end();

         rend.begin( ShapeType.Filled );

         for( int i=0; i<angle-1; i++ ){
             Vector2 point1 = GetPoint( x, y, w, h, start+i );
             Vector2 point2 = GetPoint( x, y, w, h, start+i+1 );
             rend.triangle( x, y, point1.x, point1.y, point2.x, point2.y );
         }
         rend.end();
     }

全部代码如下：

 package com.fxb.newtest;

 import sun.security.provider.certpath.Vertex;

 import com.badlogic.gdx.ApplicationAdapter;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.GL10;
 import com.badlogic.gdx.graphics.Pixmap;
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
 import com.badlogic.gdx.math.Rectangle;
 import com.badlogic.gdx.math.Vector2;

 public class Lib012_CdDraw extends ApplicationAdapter{

     ShapeRenderer rend;

     float[] vertexs;

     Pixmap pixmap;
     float angle = 0;

     @Override
     public void create() {
         // TODO Auto-generated method stub
         rend = new ShapeRenderer();

         vertexs = new float[]{ 100, 100, 250, 100, 200, 200, 100, 250 };

     }

     public void FillPolygon( float[] vertexs, ShapeRenderer rend, Color color ){
         if( vertexs.length%2 != 0 ){
             return;
         }
         rend.begin( ShapeType.Filled );
         rend.setColor( color );
         for( int i=2; i<=vertexs.length-4; i+=2 ){
             rend.triangle( vertexs[0], vertexs[1], vertexs[i], vertexs[i+1], vertexs[i+2], vertexs[i+3] );
         }
         rend.end();
     }

     public float Change( float angle0 ){
         return (float)Math.tan( angle0*(float)Math.PI/180 );
     }

     public void FillRect( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color ){

         rend.begin( ShapeType.Line );
         rend.setColor( color );
         rend.rect( x-w, y-h, 2*w, 2*h );
         rend.end();

         rend.begin( ShapeType.Filled );
         rend.setColor( color );
         //angle = angle*(float)Math.PI/180;

         if( angle <= 45 ){
             rend.triangle( x, y, x+w, y, x+w, y+w*(float)Math.tan( angle*(float)Math.PI/180 ) );
         }
         else if( angle <= 135 ){
             rend.triangle( x, y, x+w, y, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x+h*(float)Math.tan( (90-angle)*(float)Math.PI/180 ), y+h );
         }
         else if( angle <= 135+90 ){
             rend.triangle( x, y, x+w, y, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x-w, y+h );
             rend.triangle( x, y, x-w, y+h, x-w, y-w*Change( angle ) );
         }
         else if( angle <= 135+180 ){
             rend.triangle( x, y, x+w, y, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x-w, y+h );
             rend.triangle( x, y, x-w, y+h, x-w, y-h );
             rend.triangle( x, y, x-w, y-h, x-h*Change( 270-angle ), y-h );
         }
         else if( angle <= 360 ){
             rend.triangle( x, y, x+w, y, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x-w, y+h );
             rend.triangle( x, y, x-w, y+h, x-w, y-h );
             rend.triangle( x, y, x-w, y-h, x+w, y-h );
             rend.triangle( x, y, x+w, y-h, x+w, y+w*Change(angle) );
         }

         rend.end();
     }

     public float GetAtan( float angle ){
         return (float)( 180*Math.atan( angle )/Math.PI );
     }

     public Vector2 GetPoint( float x, float y, float w, float h, float angle ){
         Vector2 point = new Vector2();
         while( angle >= 360 ){
             angle -= 360;
         }
         while( angle < 0 ){
             angle += 360;
         }

         System.out.println( GetAtan( h/w ) );

         if( angle>=0 && angle<GetAtan( h/w ) || angle>=360-GetAtan( h/w ) && angle<360 ){
             point.x = x+w;
             point.y = y+w*Change( angle );
         }
         else if( angle>=GetAtan( h/w ) && angle<180-GetAtan( h/w ) ){
             point.x = x+h*Change( 90-angle );
             point.y = y+h;
         }
         else if( angle>=180-GetAtan( h/w ) && angle<180+GetAtan( h/w ) ){
             point.x = x-w;
             point.y = y-w*Change( angle );
         }
         else if( angle>=180+GetAtan( h/w ) && angle<360-GetAtan( h/w ) ){
             point.x = x-h*Change( 90-angle );
             point.y = y-h;
         }

         return point;
     }

     public void FillRect1( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color ){

         rend.begin( ShapeType.Line );
         rend.setColor( color );
         rend.rect( x-w, y-h, 2*w, 2*h );
         rend.end();

         rend.begin( ShapeType.Filled );
         rend.setColor( color );
         //angle = angle*(float)Math.PI/180;

         if( angle <= 45 ){
             rend.triangle( x, y, x, y+h, x+h*Change( angle ), y+h );
         }
         else if( angle <= 135 ){
             rend.triangle( x, y, x, y+h, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x+w, y+w*Change( 90-angle ) );
         }
         else if( angle <= 135+90 ){
             rend.triangle( x, y, x, y+h, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x+w, y-h );
             rend.triangle( x, y, x+w, y-h, x-h*Change( angle ), y-h );
         }
         else if( angle <= 135+180 ){
             rend.triangle( x, y, x, y+h, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x+w, y-h );
             rend.triangle( x, y, x+w, y-h, x-w, y-h );
             rend.triangle( x, y, x-w, y-h, x-w, y-w*Change( 270-angle ) );
         }
         else if( angle <= 360 ){
             rend.triangle( x, y, x, y+h, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x+w, y-h );
             rend.triangle( x, y, x+w, y-h, x-w, y-h );
             rend.triangle( x, y, x-w, y-h, x-w, y+h );
             rend.triangle( x, y, x-w, y+h, x+h*Change( angle ), y+h );
         }

         rend.end();
     }

     public void FillRect2( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color ){

         rend.begin( ShapeType.Line );
         rend.setColor( color );
         rend.rect( x-w, y-h, 2*w, 2*h );
         rend.end();

         rend.begin( ShapeType.Filled );
         rend.setColor( color );
         //angle = angle*(float)Math.PI/180;
         rend.rect( x-w, y-h, 2*w, 2*h );

         //rend.setColor( color.mul( 0.5f ) );

         if( angle <= 45 ){
             rend.triangle( x, y, x, y+h, x+h*Change( angle ), y+h );
         }
         else if( angle <= 135 ){
             rend.triangle( x, y, x, y+h, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x+w, y+w*Change( 90-angle ) );
         }
         else if( angle <= 135+90 ){
             rend.triangle( x, y, x, y+h, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x+w, y-h );
             rend.triangle( x, y, x+w, y-h, x-h*Change( angle ), y-h );
         }
         else if( angle <= 135+180 ){
             rend.triangle( x, y, x, y+h, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x+w, y-h );
             rend.triangle( x, y, x+w, y-h, x-w, y-h );
             rend.triangle( x, y, x-w, y-h, x-w, y-w*Change( 270-angle ) );
         }
         else if( angle <= 360 ){
             rend.triangle( x, y, x, y+h, x+w, y+w );
             rend.triangle( x, y, x+w, y+h, x+w, y-h );
             rend.triangle( x, y, x+w, y-h, x-w, y-h );
             rend.triangle( x, y, x-w, y-h, x-w, y+h );
             rend.triangle( x, y, x-w, y+h, x+h*Change( angle ), y+h );
         }

         rend.end();
     }

     public void FillPartRect( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color  )
     {
         rend.begin( ShapeType.Line );
         rend.setColor( color );
         rend.rect( x-w, y-h, 2*w, 2*h );
         rend.end();

         rend.begin( ShapeType.Filled );

         for( int i=0; i<angle-1; i++ ){
             Vector2 point1 = GetPoint( x, y, w, h, start+i );
             Vector2 point2 = GetPoint( x, y, w, h, start+i+1 );
             rend.triangle( x, y, point1.x, point1.y, point2.x, point2.y );
         }
         rend.end();
     }

     public void FillCircle(  ){

     }

     @Override
     public void render() {
         // TODO Auto-generated method stub
         Gdx.gl.glClearColor( 0, 1, 1, 1 );
         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT );

         Gdx.gl.glEnable( GL10.GL_BLEND );
         Gdx.gl.glBlendFunc( GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA );

 /*        rend.begin( ShapeType.Filled );
         rend.setColor( Color.BLUE );
         //rend.polyline( vertexs );
         //rend.line( 100, 100, 200, 200 );
         //rend.triangle( 100, 100, 200, 100, 100, 200 );

         rend.arc( 100, 100, 100, 0, 60 );
         rend.circle( 300, 300, 100 );
         rend.end();*/

         //FillPolygon( vertexs, rend, Color.BLUE );

         angle += 0.5f;
 /*        if( angle > 360 ){
             angle -= 360;
         }*/

         //angle =
         //FillRect( 300, 300, 100, 100, 0, angle, rend, Color.BLUE );

         //FillRect1( 300, 300, 100, 100, 0, angle, rend, new Color( 1f, 0.7f, 0.7f, 0.5f ));
         //FillRect( 300, 300, 100, 100, 0, 90, rend, new Color( 1, 1, 1, 0 ) );
         //FillRect2( 300, 300, 100, 100, 0, angle, rend, Color.BLUE);

         FillPartRect( 300, 300, 100, 100, 90, 360-angle, rend, Color.BLUE);
     }

     @Override
     public void dispose() {
         // TODO Auto-generated method stub
         rend.dispose();
         super.dispose();
     }

 }

运行结果：