tailieunhanh - Crystal Reports 10 for dummies phần 7

Như bạn có thể thấy, đôi khi bạn phải sử dụng dấu ngoặc kép trong một cách khác thường để tránh gây nhầm lẫn chuỗi phân tích cú pháp. (Phân tích cú pháp chuỗi là một phần của Crystal Reports, phân tích và diễn giải các chuỗi, một trong những nhân vật tại một thời điểm). Bất cứ điều gì trong dấu ngoặc kép là một chuỗi, ngay cả nếu nó trông giống như một số hoặc giá trị một đồng tiền | Chapter 15 Enhancing Reports with Charts 213 Stacked bar chart The stacked bar chart also represents multiple series of data as vertical or horizontal bars but a single bar represents each value for all series. The value of the second series is stacked on top of the value of the first series the value of the third series stacked on top of the second series value and so on. As with the side-by-side bar chart the stacked bar chart is good for showing the total value of multiple series of data while also showing how the relative contribution of each series changes over time. Figure 15-3 shows a 2-D stacked bar chart. 3-D stacked bar charts are also available. Figure 15-3 2-D stacked bar chart. Line chart A line chart displays one or more lines that each connect a series of points. This type of chart is excellent for showing the value of a single variable as it changes over time or the values of several variables with comparable scales. Figure 15-4 shows a line chart of calories consumed daily for the week starting January 1 2004. This person is not very consistent in his eating patterns. Calorie consumption ranges from about 1900 down to near-starvation level at 1200. Area chart In an area chart areas that are filled in with colors or patterns represent the values of variables. This type of chart is good for showing the percentage contribution of a small number of variables to a total. Figure 15-5 shows an area chart displaying the same information that the previously displayed bar charts presented. 214 Part III Advanced Report Types and Features Figure 15-4 Line chart. Figure 15-5 Area chart. This chart makes it abundantly clear that the bulk of this person s diet was carbohydrates in the time period plotted with a relatively small amount of protein consumption. Pie chart Pie charts are two-dimensional circular charts that display one series of data values where each value determines how large a sector of the pie that element of the series receives. You might use a .