ChartDirector是一款使用方便快捷、功能非常强大且交互性强的通用Web图表组件。在Web服务器以及嵌入式应用程序开发中,ChartDirector是一个非常理想的图表工具,因为它拥有丰富的图表图形组件库。
一、图标饼图(一)
此示例演示如何使用CDML和参数替换格式化在扇区标签中包含图标。它还演示了渐变背景颜色,标题的玻璃着色效果和图表框的圆角。
- 渐变背景颜色使用Chart.metalColor创建,蓝色为基色,垂直方向。
- 使用BaseChart.setRoundedFrame配置圆角框架。
- 标题的玻璃着色效果使用Chart.glassEffect定义,然后使用标题TextBox对象的Box.setBackground应用于标题。
- 使用BaseChart.addExtraField将图标文件名作为额外字段添加到图表中。
- 扇区标签格式字符串使用CDML和参数替换格式指定为:
<* block,valign = absmiddle *> <* img = {field0} *> <* block *> {label} <* br *> {percent}%<* / *> <* / *>
这意味着扇区标签是一个块,其中包含一个图像,后跟另一个文本块。图像文件取自额外字段。文本块包含两行显示扇区名称和百分比。
- 格式字符串使用PieChart.setLabelFormat应用于图表。
- 对于Web应用程序,我们需要设置搜索路径以使用BaseChart.setSearchPath从当前脚本目录加载图标图像。这是因为对于某些Web服务器(例如IIS),默认的当前目录不是脚本目录(例如,IIS使用IIS可执行目录),因此需要显式设置搜索路径。
源代码清单
#include "chartdir.h"
int main(int argc, char *argv[])
{
// The data for the pie chart
double data[] = {72, 18, 15, 12};
// The depths for the sectors
double depths[] = {30, 20, 10, 10};
// The labels for the pie chart
const char *labels[] = {"Sunny", "Cloudy", "Rainy", "Snowy"};
// The icons for the sectors
const char *icons[] = {"sun.png", "cloud.png", "rain.png", "snowy.png"};
// Create a PieChart object of size 400 x 310 pixels, with a blue (CCCCFF) vertical metal
// gradient background, black border, 1 pixel 3D border effect and rounded corners
PieChart *c = new PieChart(400, 310, Chart::metalColor(0xccccff, 0), 0x000000, 1);
c->setRoundedFrame();
// Set the center of the pie at (200, 180) and the radius to 100 pixels
c->setPieSize(200, 180, 100);
// Add a title box using 15pt Times Bold Italic font, on a blue (CCCCFF) background with glass
// effect
c->addTitle("Weather Profile in Wonderland", "timesbi.ttf", 15)->setBackground(0xccccff,
0x000000, Chart::glassEffect());
// Set the pie data and the pie labels
c->setData(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))), StringArray(labels, (int)(
sizeof(labels) / sizeof(labels[0]))));
// Add icons to the chart as a custom field
c->addExtraField(StringArray(icons, (int)(sizeof(icons) / sizeof(icons[0]))));
// Configure the sector labels using CDML to include the icon images
c->setLabelFormat(
"<*block,valign=absmiddle*><*img={field0}*> <*block*>{label}\n{percent}%<*/*><*/*>");
// Draw the pie in 3D with variable 3D depths
c->set3D(DoubleArray(depths, (int)(sizeof(depths) / sizeof(depths[0]))));
// Set the start angle to 225 degrees may improve layout when the depths of the sector are
// sorted in descending order, because it ensures the tallest sector is at the back.
c->setStartAngle(225);
// Output the chart
c->makeChart("iconpie.png");
//free up resources
delete c;
return 0;
}
二、图标饼图(二)
此示例扩展了Icon Pie Chart(1)示例,演示如何使用CDML在图表标题,扇区标签和绘制徽标中包含多种字体和颜色。它还演示了银色背景颜色,圆角和标题的玻璃阴影效果。
- 银背景通过使用实现Chart.silverColor创建银色,然后用它在PieChart.PieChart作为图表背景颜色。
- 使用BaseChart.setRoundedFrame配置圆角框架。
- 包含多种字体和颜色的标题以CDML编写,并使用BaseChart.addTitle添加到图表中。
- 标题的玻璃着色效果使用Chart.glassEffect定义,然后使用标题TextBox对象的Box.setBackground应用于标题。
- 使用CDML设计的徽标使用BaseChart.addTitle2与BottomRight对齐添加到图表中作为另一个标题。
- 扇区标签的图标文件名使用BaseChart.addExtraField作为额外字段添加到图表中。
- 扇区标签格式字符串使用CDML和参数替换和格式指定为:
<* block,valign = absmiddle *> <* img = {field0} *> {label}({percent | 0}%)
这意味着扇区标签是一个块,其中包含一个图像,后跟扇区名称和百分比。图像文件取自额外字段。
- 格式字符串使用PieChart.setLabelFormat应用于图表。
- 对于Web应用程序,我们需要设置搜索路径以使用BaseChart.setSearchPath从当前脚本目录加载图标图像。这是因为对于某些Web服务器(例如IIS),默认的当前目录不是脚本目录(例如,IIS使用IIS可执行目录),因此需要显式设置搜索路径。
源代码清单
#include "chartdir.h"
int main(int argc, char *argv[])
{
// The data for the pie chart
double data[] = {28, 45, 5, 1, 12};
// The labels for the pie chart
const char *labels[] = {"Excellent", "Good", "Bad", "Very Bad", "Neutral"};
// The icons for the sectors
const char *icons[] = {"laugh.png", "smile.png", "sad.png", "angry.png", "nocomment.png"};
// Create a PieChart object of size 560 x 300 pixels, with a silver background, black border, 1
// pxiel 3D border effect and rounded corners
PieChart *c = new PieChart(560, 300, Chart::silverColor(), 0x000000, 1);
c->setRoundedFrame();
// Set the center of the pie at (280, 150) and the radius to 120 pixels
c->setPieSize(280, 150, 120);
// Add a title box with title written in CDML, on a sky blue (A0C8FF) background with glass
// effect
c->addTitle(
"<*block,valign=absmiddle*><*img=doc.png*> Customer Survey: "
"<*font=timesi.ttf,color=000000*>Do you like our <*font,color=dd0000*>Hyper<*super*>TM"
"<*/font*> molecules?", "timesbi.ttf", 15, 0x000080)->setBackground(0xa0c8ff, 0x000000,
Chart::glassEffect());
// Add a logo to the chart written in CDML as the bottom title aligned to the bottom right
c->addTitle(Chart::BottomRight,
"<*block,valign=absmiddle*><*img=molecule.png*> <*block*><*color=FF*>"
"<*font=timesbi.ttf,size=12*>Molecular Engineering\n<*font=arial.ttf,size=10*>Creating "
"better molecules");
// Set the pie data and the pie labels
c->setData(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))), StringArray(labels, (int)(
sizeof(labels) / sizeof(labels[0]))));
// Set 3D style
c->set3D();
// Use the side label layout method
c->setLabelLayout(Chart::SideLayout);
// Set the label background color to transparent
c->setLabelStyle()->setBackground(Chart::Transparent);
// Add icons to the chart as a custom field
c->addExtraField(StringArray(icons, (int)(sizeof(icons) / sizeof(icons[0]))));
// Configure the sector labels using CDML to include the icon images
c->setLabelFormat("<*block,valign=absmiddle*><*img={field0}*> {label} ({percent|0}%)");
// Explode the 3rd and 4th sectors as a group (index = 2 and 3)
c->setExplodeGroup(2, 3);
// Set the start angle to 135 degrees may improve layout when there are many small sectors at
// the end of the data array (that is, data sorted in descending order). It is because this
// makes the small sectors position near the horizontal axis, where the text label has the least
// tendency to overlap. For data sorted in ascending order, a start angle of 45 degrees can be
// used instead.
c->setStartAngle(135);
// Output the chart
c->makeChart("iconpie2.png");
//free up resources
delete c;
return 0;
}
想要了解更多ChartDirector相关内容请点击这里。