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 ---