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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。

 1     public Vector2 GetPoint( float x, float y, float w, float h, float angle ){
 2         Vector2 point = new Vector2();
 3         while( angle >= 360 ){
 4             angle -= 360;
 5         }
 6         while( angle < 0 ){
 7             angle += 360;
 8         }
 9         
10         System.out.println( GetAtan( h/w ) );
11         
12         if( angle>=0 && angle<GetAtan( h/w ) || angle>=360-GetAtan( h/w ) && angle<360 ){
13             point.x = x+w;
14             point.y = y+w*Change( angle );
15         }
16         else if( angle>=GetAtan( h/w ) && angle<180-GetAtan( h/w ) ){
17             point.x = x+h*Change( 90-angle );
18             point.y = y+h;            
19         }
20         else if( angle>=180-GetAtan( h/w ) && angle<180+GetAtan( h/w ) ){
21             point.x = x-w;
22             point.y = y-w*Change( angle );            
23         }
24         else if( angle>=180+GetAtan( h/w ) && angle<360-GetAtan( h/w ) ){
25             point.x = x-h*Change( 90-angle );
26             point.y = y-h;                
27         }
28         
29         return point;
30     }

画部分矩形

 1     public void FillPartRect( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color  )
 2     {
 3         rend.begin( ShapeType.Line );
 4         rend.setColor( color );
 5         rend.rect( x-w, y-h, 2*w, 2*h );
 6         rend.end();
 7         
 8         rend.begin( ShapeType.Filled );
 9         
10         for( int i=0; i<angle-1; i++ ){
11             Vector2 point1 = GetPoint( x, y, w, h, start+i );
12             Vector2 point2 = GetPoint( x, y, w, h, start+i+1 );
13             rend.triangle( x, y, point1.x, point1.y, point2.x, point2.y );
14         } 
15         rend.end();
16     }

全部代码如下：

  1 package com.fxb.newtest;
  2 
  3 import sun.security.provider.certpath.Vertex;
  4 
  5 import com.badlogic.gdx.ApplicationAdapter;
  6 import com.badlogic.gdx.Gdx;
  7 import com.badlogic.gdx.graphics.Color;
  8 import com.badlogic.gdx.graphics.GL10;
  9 import com.badlogic.gdx.graphics.Pixmap;
 10 import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
 11 import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
 12 import com.badlogic.gdx.math.Rectangle;
 13 import com.badlogic.gdx.math.Vector2;
 14 
 15 public class Lib012_CdDraw extends ApplicationAdapter{
 16 
 17     ShapeRenderer rend;
 18     
 19     float[] vertexs;
 20     
 21     Pixmap pixmap;
 22     float angle = 0;
 23     
 24     @Override
 25     public void create() {
 26         // TODO Auto-generated method stub
 27         rend = new ShapeRenderer();
 28         
 29         vertexs = new float[]{ 100, 100, 250, 100, 200, 200, 100, 250 };
 30         
 31     }
 32     
 33     
 34     public void FillPolygon( float[] vertexs, ShapeRenderer rend, Color color ){
 35         if( vertexs.length%2 != 0 ){
 36             return;
 37         }
 38         rend.begin( ShapeType.Filled );
 39         rend.setColor( color );
 40         for( int i=2; i<=vertexs.length-4; i+=2 ){
 41             rend.triangle( vertexs[0], vertexs[1], vertexs[i], vertexs[i+1], vertexs[i+2], vertexs[i+3] );
 42         }
 43         rend.end();
 44     }
 45     
 46     public float Change( float angle0 ){
 47         return (float)Math.tan( angle0*(float)Math.PI/180 );
 48     }
 49     
 50     public void FillRect( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color ){
 51         
 52         rend.begin( ShapeType.Line );
 53         rend.setColor( color );
 54         rend.rect( x-w, y-h, 2*w, 2*h );
 55         rend.end();
 56         
 57         rend.begin( ShapeType.Filled );
 58         rend.setColor( color );
 59         //angle = angle*(float)Math.PI/180;
 60         
 61         if( angle <= 45 ){
 62             rend.triangle( x, y, x+w, y, x+w, y+w*(float)Math.tan( angle*(float)Math.PI/180 ) );    
 63         }
 64         else if( angle <= 135 ){
 65             rend.triangle( x, y, x+w, y, x+w, y+w );
 66             rend.triangle( x, y, x+w, y+h, x+h*(float)Math.tan( (90-angle)*(float)Math.PI/180 ), y+h );
 67         }
 68         else if( angle <= 135+90 ){
 69             rend.triangle( x, y, x+w, y, x+w, y+w );
 70             rend.triangle( x, y, x+w, y+h, x-w, y+h );
 71             rend.triangle( x, y, x-w, y+h, x-w, y-w*Change( angle ) );
 72         }
 73         else if( angle <= 135+180 ){
 74             rend.triangle( x, y, x+w, y, x+w, y+w );
 75             rend.triangle( x, y, x+w, y+h, x-w, y+h );
 76             rend.triangle( x, y, x-w, y+h, x-w, y-h );
 77             rend.triangle( x, y, x-w, y-h, x-h*Change( 270-angle ), y-h );
 78         }
 79         else if( angle <= 360 ){
 80             rend.triangle( x, y, x+w, y, x+w, y+w );
 81             rend.triangle( x, y, x+w, y+h, x-w, y+h );
 82             rend.triangle( x, y, x-w, y+h, x-w, y-h );
 83             rend.triangle( x, y, x-w, y-h, x+w, y-h );
 84             rend.triangle( x, y, x+w, y-h, x+w, y+w*Change(angle) );
 85         }
 86 
 87         rend.end();        
 88     }
 89     
 90     public float GetAtan( float angle ){
 91         return (float)( 180*Math.atan( angle )/Math.PI );
 92     }
 93 
 94     public Vector2 GetPoint( float x, float y, float w, float h, float angle ){
 95         Vector2 point = new Vector2();
 96         while( angle >= 360 ){
 97             angle -= 360;
 98         }
 99         while( angle < 0 ){
100             angle += 360;
101         }
102         
103         System.out.println( GetAtan( h/w ) );
104         
105         if( angle>=0 && angle<GetAtan( h/w ) || angle>=360-GetAtan( h/w ) && angle<360 ){
106             point.x = x+w;
107             point.y = y+w*Change( angle );
108         }
109         else if( angle>=GetAtan( h/w ) && angle<180-GetAtan( h/w ) ){
110             point.x = x+h*Change( 90-angle );
111             point.y = y+h;            
112         }
113         else if( angle>=180-GetAtan( h/w ) && angle<180+GetAtan( h/w ) ){
114             point.x = x-w;
115             point.y = y-w*Change( angle );            
116         }
117         else if( angle>=180+GetAtan( h/w ) && angle<360-GetAtan( h/w ) ){
118             point.x = x-h*Change( 90-angle );
119             point.y = y-h;                
120         }
121         
122         return point;
123     }
124     
125     
126     public void FillRect1( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color ){
127         
128         rend.begin( ShapeType.Line );
129         rend.setColor( color );
130         rend.rect( x-w, y-h, 2*w, 2*h );
131         rend.end();
132         
133         rend.begin( ShapeType.Filled );
134         rend.setColor( color );
135         //angle = angle*(float)Math.PI/180;
136         
137         if( angle <= 45 ){
138             rend.triangle( x, y, x, y+h, x+h*Change( angle ), y+h );    
139         }
140         else if( angle <= 135 ){
141             rend.triangle( x, y, x, y+h, x+w, y+w );
142             rend.triangle( x, y, x+w, y+h, x+w, y+w*Change( 90-angle ) );
143         }
144         else if( angle <= 135+90 ){
145             rend.triangle( x, y, x, y+h, x+w, y+w );
146             rend.triangle( x, y, x+w, y+h, x+w, y-h );
147             rend.triangle( x, y, x+w, y-h, x-h*Change( angle ), y-h );
148         }
149         else if( angle <= 135+180 ){
150             rend.triangle( x, y, x, y+h, x+w, y+w );
151             rend.triangle( x, y, x+w, y+h, x+w, y-h );
152             rend.triangle( x, y, x+w, y-h, x-w, y-h );
153             rend.triangle( x, y, x-w, y-h, x-w, y-w*Change( 270-angle ) );
154         }
155         else if( angle <= 360 ){
156             rend.triangle( x, y, x, y+h, x+w, y+w );
157             rend.triangle( x, y, x+w, y+h, x+w, y-h );
158             rend.triangle( x, y, x+w, y-h, x-w, y-h );
159             rend.triangle( x, y, x-w, y-h, x-w, y+h );
160             rend.triangle( x, y, x-w, y+h, x+h*Change( angle ), y+h );
161         }
162 
163         rend.end();        
164     }
165     
166 
167     public void FillRect2( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color ){
168         
169         rend.begin( ShapeType.Line );
170         rend.setColor( color );
171         rend.rect( x-w, y-h, 2*w, 2*h );
172         rend.end();
173         
174         rend.begin( ShapeType.Filled );
175         rend.setColor( color );
176         //angle = angle*(float)Math.PI/180;
177         rend.rect( x-w, y-h, 2*w, 2*h );
178         
179         //rend.setColor( color.mul( 0.5f ) );
180         
181         if( angle <= 45 ){
182             rend.triangle( x, y, x, y+h, x+h*Change( angle ), y+h );    
183         }
184         else if( angle <= 135 ){
185             rend.triangle( x, y, x, y+h, x+w, y+w );
186             rend.triangle( x, y, x+w, y+h, x+w, y+w*Change( 90-angle ) );
187         }
188         else if( angle <= 135+90 ){
189             rend.triangle( x, y, x, y+h, x+w, y+w );
190             rend.triangle( x, y, x+w, y+h, x+w, y-h );
191             rend.triangle( x, y, x+w, y-h, x-h*Change( angle ), y-h );
192         }
193         else if( angle <= 135+180 ){
194             rend.triangle( x, y, x, y+h, x+w, y+w );
195             rend.triangle( x, y, x+w, y+h, x+w, y-h );
196             rend.triangle( x, y, x+w, y-h, x-w, y-h );
197             rend.triangle( x, y, x-w, y-h, x-w, y-w*Change( 270-angle ) );
198         }
199         else if( angle <= 360 ){
200             rend.triangle( x, y, x, y+h, x+w, y+w );
201             rend.triangle( x, y, x+w, y+h, x+w, y-h );
202             rend.triangle( x, y, x+w, y-h, x-w, y-h );
203             rend.triangle( x, y, x-w, y-h, x-w, y+h );
204             rend.triangle( x, y, x-w, y+h, x+h*Change( angle ), y+h );
205         }
206 
207         rend.end();        
208     }
209     
210     
211     public void FillPartRect( float x, float y, float w, float h, float start, float angle, ShapeRenderer rend, Color color  )
212     {
213         rend.begin( ShapeType.Line );
214         rend.setColor( color );
215         rend.rect( x-w, y-h, 2*w, 2*h );
216         rend.end();
217         
218         rend.begin( ShapeType.Filled );
219         
220         for( int i=0; i<angle-1; i++ ){
221             Vector2 point1 = GetPoint( x, y, w, h, start+i );
222             Vector2 point2 = GetPoint( x, y, w, h, start+i+1 );
223             rend.triangle( x, y, point1.x, point1.y, point2.x, point2.y );
224         } 
225         rend.end();
226     }
227     
228     public void FillCircle(  ){
229         
230     }
231     
232     
233 
234     @Override
235     public void render() {
236         // TODO Auto-generated method stub
237         Gdx.gl.glClearColor( 0, 1, 1, 1 );
238         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT );
239         
240         Gdx.gl.glEnable( GL10.GL_BLEND );
241         Gdx.gl.glBlendFunc( GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA );
242         
243 /*        rend.begin( ShapeType.Filled );
244         rend.setColor( Color.BLUE );
245         //rend.polyline( vertexs );
246         //rend.line( 100, 100, 200, 200 );
247         //rend.triangle( 100, 100, 200, 100, 100, 200 );
248         
249         rend.arc( 100, 100, 100, 0, 60 );
250         rend.circle( 300, 300, 100 );    
251         rend.end();*/
252 
253         //FillPolygon( vertexs, rend, Color.BLUE );
254         
255         angle += 0.5f;
256 /*        if( angle > 360 ){
257             angle -= 360;
258         }*/
259         
260         //angle = 
261         //FillRect( 300, 300, 100, 100, 0, angle, rend, Color.BLUE );
262             
263         
264         //FillRect1( 300, 300, 100, 100, 0, angle, rend, new Color( 1f, 0.7f, 0.7f, 0.5f ));
265         //FillRect( 300, 300, 100, 100, 0, 90, rend, new Color( 1, 1, 1, 0 ) );
266         //FillRect2( 300, 300, 100, 100, 0, angle, rend, Color.BLUE);
267         
268         FillPartRect( 300, 300, 100, 100, 90, 360-angle, rend, Color.BLUE);
269     }
270 
271     @Override
272     public void dispose() {
273         // TODO Auto-generated method stub
274         rend.dispose();
275         super.dispose();
276     }
277 
278 }

运行结果：

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原文地址：https://www.cnblogs.com/MiniHouse/p/3760729.html