Adroid平台图表案例源码

Android平台创建xy图表的案例分析源码介绍，来看一下详细的源码

绘制网格线的方法

public static void  draw_the_grid(Canvas this_g,  Vector these_labels)
 
     {        
 
        double rounded_max = 0.0;
 
        double rounded_min = 0.0;
 
        double rounded_max_temp;
 
        Object curElt; 
 
        String[] cur_elt_array;
 
        int left_margin_d, right_margin_d;     
 
        if( draw_only_this_idx == -1)     
 
           curElt = these_labels.elementAt(0);  // default  it to 1st one if non set
 
        else
 
           curElt = these_labels.elementAt(draw_only_this_idx);  // now just the 1st elt
 
             
 
        cur_elt_array = (String[])curElt;
 
        rounded_max = get_ceiling_or_floor (Double.parseDouble(cur_elt_array[2]) , true);
 
        rounded_min = get_ceiling_or_floor (Double.parseDouble(cur_elt_array[3]) , false);
  
 
       // ok so now we have the max value of the set just get a cool ceiling and we go on
 
        final Paint paint = new Paint(); 
 
        paint.setTextSize(15);
 
       left_margin_d =  getCurTextLengthInPixels(paint, Double.toString(rounded_max));
 
       //keep the position for later drawing -- leave space for the legend
 
       int p_height = 170;
 
       int p_width = 220;
 
       int[] tmp_draw_sizes = {2 + left_margin_d, 25,p_width - 2 -
 
        left_margin_d ,p_height - 25 -5};
 
       drawSizes = tmp_draw_sizes; //keep it for later processing
 
        //with the mzrgins worked out draw the plotting grid
 
       paint.setStyle(Paint.Style.FILL);
 
       paint.setColor(Color.WHITE ); 
 
       // Android does by coords
 
       this_g.drawRect(drawSizes[0], drawSizes[1],drawSizes[0]+
 
        drawSizes[2], drawSizes[1]+ drawSizes[3] , paint);
 
         
 
       paint.setColor(Color.GRAY );      
 
       // finally draw the grid     
          
        paint.setStyle(Paint.Style.STROKE);
 
       this_g.drawRect(drawSizes[0], drawSizes[1],drawSizes[0]+
 
        drawSizes[2], drawSizes[1]+ drawSizes[3] , paint);
 
  
 
           for(int i=1; i < 5 ; i++)
 
           {
 
               this_g.drawLine(drawSizes[0], drawSizes[1] +
 
        (i * drawSizes[3] / 5), drawSizes[0] + drawSizes[2],
 
        drawSizes[1] + (i * drawSizes[3] / 5), paint);
 
               this_g.drawLine(drawSizes[0]+ (i * drawSizes[2] / 5),
 
        drawSizes[1], drawSizes[0] + (i * drawSizes[2] / 5),
 
        drawSizes[1] + drawSizes[3], paint);
 
           }
 
  
 
          // good for one value
 
           print_axis_values_4_grid(this_g, cur_elt_array[1] ,
 
        Double.toString(rounded_max) , Double.toString(rounded_min),
 
        cur_elt_array[0] , 2 ,0 );
 
           
 
     }  // --- end of draw_grid ---