Android 平台创建 XY 图表的完整例子

ysitbook

1. public static void  draw_the_grid(Canvas this_g,  Vector these_labels)
   
2.      {         
   
3.         double rounded_max = 0.0;
   
4.         double rounded_min = 0.0;
   
5.         double rounded_max_temp;
   
6.         Object curElt;  
   
7.         String[] cur_elt_array;
   
8.         int left_margin_d, right_margin_d;      
   
9. 
   
10.         if( draw_only_this_idx == -1)      
    
11.            curElt = these_labels.elementAt(0);  // default  it to 1st one if non set
    
12.         else
    
13.            curElt = these_labels.elementAt(draw_only_this_idx);  // now just the 1st elt
    
14.            
    
15.         cur_elt_array = (String[])curElt;
    
16. 
    
17.         rounded_max = get_ceiling_or_floor (Double.parseDouble(cur_elt_array[2]) , true);
    
18.         rounded_min = get_ceiling_or_floor (Double.parseDouble(cur_elt_array[3]) , false);
    
19. 
    
20.        // ok so now we have the max value of the set just get a cool ceiling and we go on
    
21.         final Paint paint = new Paint();  
    
22.         paint.setTextSize(15);
    
23.         
    
24.        left_margin_d =  getCurTextLengthInPixels(paint, Double.toString(rounded_max));
    
25.        //keep the position for later drawing -- leave space for the legend
    
26.        int p_height = 170;
    
27.        int p_width = 220;
    
28.        int[] tmp_draw_sizes = {2 + left_margin_d, 25,p_width - 2 -
    
29.                 left_margin_d ,p_height - 25 -5};
    
30.        drawSizes = tmp_draw_sizes; //keep it for later processing
    
31.         
    
32.         //with the mzrgins worked out draw the plotting grid
    
33.        paint.setStyle(Paint.Style.FILL);
    
34.        paint.setColor(Color.WHITE );  
    
35.       
    
36.        // Android does by coords
    
37.        this_g.drawRect(drawSizes[0], drawSizes[1],drawSizes[0]+
    
38.                 drawSizes[2], drawSizes[1]+ drawSizes[3] , paint);
    
39.       
    
40.        paint.setColor(Color.GRAY );      
    
41.       
    
42.         // finally draw the grid      
    
43.       
    
44.        paint.setStyle(Paint.Style.STROKE);
    
45.        this_g.drawRect(drawSizes[0], drawSizes[1],drawSizes[0]+
    
46.                 drawSizes[2], drawSizes[1]+ drawSizes[3] , paint);
    
47. 
    
48.            for(int i=1; i < 5 ; i++)
    
49.            {
    
50.                this_g.drawLine(drawSizes[0], drawSizes[1] +
    
51.                 (i * drawSizes[3] / 5), drawSizes[0] + drawSizes[2],
    
52.                 drawSizes[1] + (i * drawSizes[3] / 5), paint);
    
53.                this_g.drawLine(drawSizes[0]+ (i * drawSizes[2] / 5),
    
54.                 drawSizes[1], drawSizes[0] + (i * drawSizes[2] / 5),
    
55.                 drawSizes[1] + drawSizes[3], paint);
    
56.            }
    
57. 
    
58.           // good for one value
    
59.            print_axis_values_4_grid(this_g, cur_elt_array[1] ,
    
60.                 Double.toString(rounded_max) , Double.toString(rounded_min),
    
61.                 cur_elt_array[0] , 2 ,0 );
    
62.          
    
63.      }  // --- end of draw_grid ---

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