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Extending JavaServer Faces
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vertspace += scalediv; } // Render Chart Title writerwrite("<text xml:space=\"preserve\" x=\"" + TITLEOFFSET + "\" y=\"27\" style=\"font:bold 17px sans-serif\"" + "fill=\"#336699\">" + title + "</text>"); }
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The left scale uses a basic algorithm to calculate the vertical space between scale points based on scalediv (scale divisor value) This value is the total height of the chart divided by the number of scale points, which is stored in the static variable SCALEPOINTS and is set to 6 for this example Of course, in a full production version these dimension settings would probably be exposed as component attributes for maximum flexibility This exercise is left to the reader
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NOTE Writing out large amounts of markup using ResponseWriterwrite( ) statements as
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opposed to rendering every element individually using ResponseWriterstartElement( ), writeAttribute( ), and so on won t earn style points, but it does allow for easier rendering of large quantities of markup Future versions of JSF are planning to address this with an easier solution The final method, renderBars( ), loops through the items provided in chartdata and renders SVG bars in the chart
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public void renderBars(ResponseWriter writer, List chartdata) throws IOException { int maxbarheight = getMaxBarHeight(chartdata); float magfactor = (float)BARMAXPIXELHEIGHT/maxbarheight; int x=INITIALOFFSET; float y=0; for (int i = 0; i < chartdatasize(); i++) { SelectItem bar = (SelectItem) chartdataget(i); y = (float) new Integer(bargetValue()toString())floatValue(); y = y * magfactor; writerwrite("<rect x=\"" + x + "\" y=\"" + (CHARTBASE - y) + "\" width=\"" + BARWIDTH + "\" height=\"" + y + "\" fill=\"" + getRandomHexColor() + "\" stroke=\"#000000\"/>"); writerwrite("<text xml:space=\"preserve\" x=\"" + (x - LABELOFFSET) + "\" y=\"" + CHARTLABELBASE + "\" style=\"font:10px sans-serif\"" + "fill=\"#000000\">" + bargetLabel() + "</text>"); x = x + BAROFFSET; } }
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The key areas to note in this method are how the y value, which represents the column s height, is retrieved from chartdata and then multiplied by a magnification factor (magfactor) so that it fits in the chart This way, both extremely large and small values will generally render with roughly the same size in the chart
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The other key thing to notice is the bar fill color where the method getRandomHexColor( ) is called This method generates a string that represents a random color in hexadecimal red, green, blue (RGB) format for example, #5A9CC6
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String getRandomHexColor(){ return "#" + IntegertoHexString((int)(Mathrandom() * 16777215)); }
This method generates an RGB color by taking the hexadecimal string value of the product of MathRandom( ), which is a random double value greater than or equal to 0 and less than 10, and 16777215 The decimal number 16777215 is FFFFFF in hexadecimal As before, the final bit of code for this chart example is the JSP tag whose job is to process the two title and data attributes and apply their values to the chart UI component It also sets the component type of SvgBarChart, which is the name that the UI component will be registered with in faces-configxml (This step was intentionally omitted for brevity)
package comjsfcomprefcomponentstaglib; // Import statements omitted for brevity public class SvgBarChartTag extends UIComponentTag { public SvgBarChartTag(){ } public String title = null; public String data = null; public String getComponentType() { // Associates tag with UI component name in faces-configxml return "SvgBarChart"; } public String getRendererType(){ // Since renderer is embedded in the component, can return null return null; } protected void setProperties(UIComponent component) { supersetProperties(component); // Set title if (title != null) { if (isValueReference(title)) { FacesContext context = FacesContextgetCurrentInstance(); Application app = contextgetApplication(); ValueBinding vb = appcreateValueBinding(title); componentsetValueBinding("title", vb); } else componentgetAttributes()put("title", title); } if (data != null){
PART II
Part II:
Extending JavaServer Faces
if (isValueReference(data)){ FacesContext context = FacesContextgetCurrentInstance(); Application app = contextgetApplication(); ValueBinding vb = appcreateValueBinding(data); componentsetValueBinding("data", vb); } else componentgetAttributes()put("data", data); } } public void release() { superrelease(); title = null; data = null; } // Set methods for properties omitted }
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