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 ---

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转载:http://www.adobex.com/android/source/details/00000158.htm