Customizing Chart Style"
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[[File:DarkGreenTheme.png]] | [[File:DarkGreenTheme.png]] | ||
+ | |||
+ | See all themes at [https://www.zkoss.org/javadoc/latest/zkcharts/org/zkoss/chart/Theme.html Theme] | ||
+ | |||
+ | = Change Color = | ||
+ | ==Change Default Color== | ||
+ | The component defines 10 default colors, you can provide a different set of colors: | ||
+ | |||
+ | <syntaxhighlight lang='java'> | ||
+ | String[] colors = { | ||
+ | "red", | ||
+ | "blue", | ||
+ | "green", | ||
+ | "yellow", | ||
+ | "purple", | ||
+ | "orange", | ||
+ | "pink", | ||
+ | "brown", | ||
+ | "gray", | ||
+ | "teal", | ||
+ | "black" | ||
+ | }; | ||
+ | @Override | ||
+ | public void doAfterCompose(Component comp) throws Exception { | ||
+ | ... | ||
+ | charts.setColors(colors); //provide a list of default colors | ||
+ | } | ||
+ | </syntaxhighlight> | ||
+ | |||
+ | == Change a Series Color == | ||
+ | |||
+ | <syntaxhighlight lang='java'> | ||
+ | charts.getSeries().setColor("#aabbcc"); //change a specific series | ||
+ | </syntaxhighlight> | ||
== Customizing Colors == | == Customizing Colors == | ||
− | ZK Charts uses <javadoc directory="zkcharts">org.zkoss.chart.Color</javadoc> class to apply the color to the color-changing method in the option, such as < | + | ZK Charts uses <javadoc directory="zkcharts">org.zkoss.chart.Color</javadoc> class to apply the color to the color-changing method in the option, such as <code>setBackgroundColor()</code> or <code>setFillColor()</code>. <code>Color</code> supports solid color and gradient color. |
− | ZK Charts use the < | + | ZK Charts use the <code>Color</code> class to represent web color including solid or gradient. It can be applied to the configuration so that we can obtain a customized style. |
=== Solid Color === | === Solid Color === | ||
Solid color can be specified as an RGB triplet, in hexadecimal format or any valid color format in browsers: | Solid color can be specified as an RGB triplet, in hexadecimal format or any valid color format in browsers: | ||
− | * RGB triplet - rgb(186,86,150) | + | * RGB triplet - <code>new Color("rgb(186,86,150)")</code> |
− | * Hexadecimal format - #58BA7A | + | * Hexadecimal format - <code>new Color("#58BA7A")</code> |
=== Gradient Color === | === Gradient Color === | ||
− | + | A gradient is a smooth color transition from one color to another. In ZK Charts, a gradient is defined by <javadoc directory="zkcharts">org.zkoss.chart.LinearGradient</javadoc> or <javadoc directory="zkcharts">org.zkoss.chart.RadialGradient</javadoc>, they have similar attributes to [http://www.w3.org/TR/SVG11/pservers.html#Gradients SVG Gradients]. | |
==== Linear Gradient ==== | ==== Linear Gradient ==== | ||
− | Linear gradient contains attributes < | + | Linear gradient contains attributes <code>x1</code>, <code>y2</code>, <code>x2</code> and <code>y2</code> to define the start and end position of the gradient. It can be assigned like below: |
<source lang="java"> | <source lang="java"> | ||
// Create a linear gradient which x1=0, y1=0, x2 = 0, y2=1 with percentages represent values | // Create a linear gradient which x1=0, y1=0, x2 = 0, y2=1 with percentages represent values | ||
Line 81: | Line 114: | ||
For example, we can apply the linear gradient color to the series as below: | For example, we can apply the linear gradient color to the series as below: | ||
− | <source lang="xml" | + | <source lang="xml" highlight="2, 3"> |
<div apply="ColorfulColumnChartComposer"> | <div apply="ColorfulColumnChartComposer"> | ||
<charts id="chart" type="column" width="480" | <charts id="chart" type="column" width="480" | ||
Line 87: | Line 120: | ||
</div> | </div> | ||
</source> | </source> | ||
− | <source lang="java" | + | <source lang="java" highlight="21, 24, 25, 26, 27, 28, 29"> |
public class ColorfulColumnChartComposer extends SelectorComposer<Div> { | public class ColorfulColumnChartComposer extends SelectorComposer<Div> { | ||
@Wire | @Wire | ||
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==== Radial Gradient ==== | ==== Radial Gradient ==== | ||
Radial gradient is similar to linear gradient, but it specifies the attributes to define the outermost circle instead of line position: | Radial gradient is similar to linear gradient, but it specifies the attributes to define the outermost circle instead of line position: | ||
− | <source lang="java" | + | <source lang="java" highlight="2"> |
// cx=0.4, cy=0.3, cr=0.6 | // cx=0.4, cy=0.3, cr=0.6 | ||
RadialGradient radialGradient = new RadialGradient(0.4, 0.3, 0.6); | RadialGradient radialGradient = new RadialGradient(0.4, 0.3, 0.6); | ||
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</source> | </source> | ||
− | <source lang="java" | + | <source lang="java" highlight="17, 21, 22, 23, 24, 25, 26"> |
public class PacmanChartComposer extends SelectorComposer<Div> { | public class PacmanChartComposer extends SelectorComposer<Div> { | ||
@Wire | @Wire | ||
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= Customize Axis Label with HTML = | = Customize Axis Label with HTML = | ||
− | Sometimes you want special axis label e.g. a hyperlink on an axis label, you can enable this feature by < | + | Sometimes you want special axis label e.g. a hyperlink on an axis label, you can enable this feature by <code>chart.getXAxis().getLabels().setUseHTML(true)</code>. Please refer to the example code below for details: |
− | <source lang='java' | + | <source lang='java' highlight='12, 15'> |
public class HtmlLabelComposer extends SelectorComposer<Component> { | public class HtmlLabelComposer extends SelectorComposer<Component> { | ||
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chart.getSeries().getDataLabels().setFormatter(js); | chart.getSeries().getDataLabels().setFormatter(js); | ||
} | } | ||
− | <source | + | </source> |
+ | |||
− | |||
− | |||
{{ZKChartsEssentialsPageFooter}} | {{ZKChartsEssentialsPageFooter}} |
Latest revision as of 02:11, 9 November 2023
Switching in Between Themes
ZK Charts provides many predefined color themes for you to use.
Here's a list of the themes in which you can choose from:
- Default Theme
1 chart.setTheme(Theme.DEFAULT);
- Grid Theme
1 chart.setTheme(Theme.GRID);
- Skies Theme
1 chart.setTheme(Theme.SKIES);
- Gray Theme
1 chart.setTheme(Theme.GRAY);
- Dark Blue Theme
1 chart.setTheme(Theme.DARK_BLUE);
- Dark Green Theme
1 chart.setTheme(Theme.DARK_GREEN);
See all themes at Theme
Change Color
Change Default Color
The component defines 10 default colors, you can provide a different set of colors:
String[] colors = {
"red",
"blue",
"green",
"yellow",
"purple",
"orange",
"pink",
"brown",
"gray",
"teal",
"black"
};
@Override
public void doAfterCompose(Component comp) throws Exception {
...
charts.setColors(colors); //provide a list of default colors
}
Change a Series Color
charts.getSeries().setColor("#aabbcc"); //change a specific series
Customizing Colors
ZK Charts uses Color class to apply the color to the color-changing method in the option, such as setBackgroundColor()
or setFillColor()
. Color
supports solid color and gradient color.
ZK Charts use the Color
class to represent web color including solid or gradient. It can be applied to the configuration so that we can obtain a customized style.
Solid Color
Solid color can be specified as an RGB triplet, in hexadecimal format or any valid color format in browsers:
- RGB triplet -
new Color("rgb(186,86,150)")
- Hexadecimal format -
new Color("#58BA7A")
Gradient Color
A gradient is a smooth color transition from one color to another. In ZK Charts, a gradient is defined by LinearGradient or RadialGradient, they have similar attributes to SVG Gradients.
Linear Gradient
Linear gradient contains attributes x1
, y2
, x2
and y2
to define the start and end position of the gradient. It can be assigned like below:
// Create a linear gradient which x1=0, y1=0, x2 = 0, y2=1 with percentages represent values
LinearGradient linearGradient2 = new LinearGradient(0, 0, 0, 1);
// Create a linear gradient which x1=0, y1=0, x2 = 0, y2=300 with coordinate
LinearGradient linearGradient2 = new LinearGradient(0, 0, 0, 300);
The stop attributes can be assigned as below:
// Same as lineraGradient.addStop(0, "#EEEEEE"); lineraGradient.addStop(1, "#CCCCCC");
lineraGradient.setsStop("#EEEEEE", "#CCCCCC");
For example, we can apply the linear gradient color to the series as below:
<div apply="ColorfulColumnChartComposer">
<charts id="chart" type="column" width="480"
height="300" title="Colorful Column Chart"/>
</div>
public class ColorfulColumnChartComposer extends SelectorComposer<Div> {
@Wire
Charts chart;
public void doAfterCompose(Div comp) throws Exception {
super.doAfterCompose(comp);
CategoryModel model = new DefaultCategoryModel();
model.setValue("1900", "Q1", new Integer(20));
model.setValue("1900", "Q2", new Integer(55));
model.setValue("1900", "Q3", new Integer(40));
model.setValue("1900", "Q4", new Integer(75));
chart.setModel(model);
// remove grid line
chart.getYAxis().setGridLineWidth(0);
// remove y axis title
chart.getYAxis().setTitle("");
useGradientColor();
}
private void useGradientColor() {
// Create a linear gradient which x1=0.5, y1=0, x2 = 0.5, y2=1 with percentages represent values
LinearGradient gradient = new LinearGradient(0.5, 0, 0.5, 1);
gradient.addStop(0, "#F39C12");
gradient.addStop(0.4, "#F1C40F");
gradient.addStop(1, "#8E44AD");
chart.getSeries().setColor(new Color(gradient));
}
}
Radial Gradient
Radial gradient is similar to linear gradient, but it specifies the attributes to define the outermost circle instead of line position:
// cx=0.4, cy=0.3, cr=0.6
RadialGradient radialGradient = new RadialGradient(0.4, 0.3, 0.6);
radialGradient.setStops("#EEEEEE", "#CCCCCC");
For example, here is pacman chart with radial gradient fill:
<div apply="demo.PacmanChartComposer">
<charts id="chart" type="pie" width="480"
height="300" title="Pacman Chart"/>
</div>
public class PacmanChartComposer extends SelectorComposer<Div> {
@Wire
Charts chart;
public void doAfterCompose(Div comp) throws Exception {
super.doAfterCompose(comp);
PiePlotOptions plotOptions = chart.getPlotOptions().getPie();
plotOptions.setStartAngle(70);
plotOptions.getDataLabels().setEnabled(false);
Series series = chart.getSeries();
Point ghost = new Point("Ghost", 40);
ghost.setColor("#FFFFFF");
series.addPoint(ghost);
Point pacman = new Point("Pacman", 320);
pacman.setColor(getPacmanColor());
series.addPoint(pacman);
}
private Color getPacmanColor() {
// cx=0.4, cy=0.3, cr=0.9
RadialGradient radialGradient = new RadialGradient(0.4, 0.3, 0.9);
radialGradient.addStop(0, "#F1C40F");
radialGradient.addStop(1, "#F39C12");
return new Color(radialGradient);
}
}
Customize Axis Label with HTML
Sometimes you want special axis label e.g. a hyperlink on an axis label, you can enable this feature by chart.getXAxis().getLabels().setUseHTML(true)
. Please refer to the example code below for details:
public class HtmlLabelComposer extends SelectorComposer<Component> {
@Wire
Charts chart;
private static CategoryModel model;
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);
model = new DefaultCategoryModel();
model.setValue("John", "<a title='great!!' href='http://www.zkoss.org' class='hastip'>Apples</a>", new Integer(5));
...
// enable html usage
chart.getXAxis().getLabels().setUseHTML(true);
}
}
Then, the axis label will become a hyperlink. (see the image below)
Change Decimal Point or Thousands Separator
public class DrilldownOnDemandComposer implements Composer<Charts> {
...
Lang lang = new Lang();
lang.setDecimalPoint(",");
lang.setThousandsSep(".");
Options options = new Options();
options.setLang(lang);
chart.setOptions(options);
- Reference Highcharts Configuration
Data Label
Show x / y values in a custom format, e.g. 2000 -> 2K.
org.zkoss.zkcharts.essentials.customizing.HtmlLabelComposer
private void setDatalabelFormatter() {
JavaScriptValue js = new JavaScriptValue("function(){if ( this.y > 1000 ) return Highcharts.numberFormat( this.y/1000, 1) + \"K\"; \n" +
"else \n" +
" return this.y;}");
chart.getSeries().getDataLabels().setEnabled(true);
chart.getSeries().getDataLabels().setFormatter(js);
}
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