#/ Handles the initial request
#/
#/ The WebChartViewer object to handle the chart.
function createFirstChart(&$viewer) {
# Initialize the Javascript ChartViewer
$viewer->setScrollDirection(DirectionHorizontalVertical);
$viewer->setZoomDirection(DirectionHorizontalVertical);
$viewer->setMouseUsage(MouseUsageScroll);
# Draw the chart
drawChart($viewer);
}
#/
#/ Handles partial update (AJAX chart update)
#/
#/ The WebChartViewer object to handle the chart.
function processPartialUpdate(&$viewer) {
# In this demo, we just need to redraw the chart
drawChart($viewer);
}
#/
#/ Handles full update
#/
#/ The WebChartViewer object to handle the chart.
function processFullUpdate(&$viewer) {
# In this demo, we just need to redraw the chart
drawChart($viewer);
}
#/
#/ Draw the chart
#/
#/ The WebChartViewer object to handle the chart.
function drawChart(&$viewer) {
#
# For simplicity, in this demo, we just use hard coded data. In a real application, the data may
# come from a dynamic source such as a database. (See "Using Data Sources with ChartDirector" in
# the ChartDirector documentation if you need some sample code on how to read data from database
# to array variables.)
#
$dataX0 = array(10, 15, 6, -12, 14, -8, 13, -3, 16, 12, 10.5, -7, 3, -10, -5, 2, 5);
$dataY0 = array(130, 150, 80, 110, -110, -105, -130, -15, -170, 125, 125, 60, 25, 150, 150, 15,
120);
$dataX1 = array(6, 7, -4, 3.5, 7, 8, -9, -10, -12, 11, 8, -3, -2, 8, 4, -15, 15);
$dataY1 = array(65, -40, -40, 45, -70, -80, 80, 10, -100, 105, 60, 50, 20, 170, -25, 50, 75);
$dataX2 = array(-10, -12, 11, 8, 6, 12, -4, 3.5, 7, 8, -9, 3, -13, 16, -7.5, -10, -15);
$dataY2 = array(65, -80, -40, 45, -70, -80, 80, 90, -100, 105, 60, -75, -150, -40, 120, -50, -30
);
# Create an XYChart object 500 x 480 pixels in size, with light blue (c0c0ff) as background
# color
$c = new XYChart(500, 480, 0xc0c0ff);
# Set the plotarea at (50, 40) and of size 400 x 400 pixels. Use light grey (c0c0c0) horizontal
# and vertical grid lines. Set 4 quadrant coloring, where the colors of the quadrants alternate
# between lighter and deeper grey (dddddd/eeeeee).
$plotAreaObj = $c->setPlotArea(50, 40, 400, 400, -1, -1, -1, 0xc0c0c0, 0xc0c0c0);
$plotAreaObj->set4QBgColor(0xdddddd, 0xeeeeee, 0xdddddd, 0xeeeeee, 0x000000);
# Enable clipping mode to clip the part of the data that is outside the plot area.
$c->setClipping();
# Set 4 quadrant mode, with both x and y axes symetrical around the origin
$c->setAxisAtOrigin(XYAxisAtOrigin, XAxisSymmetric + YAxisSymmetric);
# Add a legend box at (450, 40) (top right corner of the chart) with vertical layout and 8 pts
# Arial Bold font. Set the background color to semi-transparent grey (40dddddd).
$legendBox = $c->addLegend(450, 40, true, "arialbd.ttf", 8);
$legendBox->setAlignment(TopRight);
$legendBox->setBackground(0x40dddddd);
# Add titles to axes
$c->xAxis->setTitle("Alpha Index");
$c->yAxis->setTitle("Beta Index");
# Set axes line width to 2 pixels
$c->xAxis->setWidth(2);
$c->yAxis->setWidth(2);
# The default ChartDirector settings has a denser y-axis grid spacing and less-dense x-axis grid
# spacing. In this demo, we want the tick spacing to be symmetrical. We use around 40 pixels
# between major ticks and 20 pixels between minor ticks.
$c->xAxis->setTickDensity(40, 20);
$c->yAxis->setTickDensity(40, 20);
#
# In this example, we represent the data by scatter points. If you want to represent the data by
# somethings else (lines, bars, areas, floating boxes, etc), just modify the code below to use
# the layer type of your choice.
#
# Add scatter layer, using 11 pixels red (ff33333) X shape symbols
$c->addScatterLayer($dataX0, $dataY0, "Group A", Cross2Shape(), 11, 0xff3333);
# Add scatter layer, using 11 pixels green (33ff33) circle symbols
$c->addScatterLayer($dataX1, $dataY1, "Group B", CircleShape, 11, 0x33ff33);
# Add scatter layer, using 11 pixels blue (3333ff) triangle symbols
$c->addScatterLayer($dataX2, $dataY2, "Group C", TriangleSymbol, 11, 0x3333ff);
# if (viewer.getCustomAttr("minY") == null) {
if (($viewer->getCustomAttr("minY") == null) || ($viewer->getCustomAttr("minY") == "")) {
# The axis scale has not yet been set up. This means this is the first time the chart is
# drawn and it is drawn with no zooming. We can use auto-scaling to determine the
# axis-scales, then remember them for future use.
# explicitly auto-scale axes so we can get the axis scales
$c->layout();
# save the axis scales for future use
$xAxisObj = $c->xAxis;
$viewer->setCustomAttr("minX", $xAxisObj->getMinValue());
$xAxisObj = $c->xAxis;
$viewer->setCustomAttr("maxX", $xAxisObj->getMaxValue());
$yAxisObj = $c->yAxis;
$viewer->setCustomAttr("minY", $yAxisObj->getMinValue());
$yAxisObj = $c->yAxis;
$viewer->setCustomAttr("maxY", $yAxisObj->getMaxValue());
} else {
# Retrieve the original full axes scale
$minX = $viewer->getCustomAttr("minX");
$maxX = $viewer->getCustomAttr("maxX");
$minY = $viewer->getCustomAttr("minY");
$maxY = $viewer->getCustomAttr("maxY");
# Compute the zoomed-in axis scales by multiplying the full axes scale with the view port
# ratio
$xScaleMin = $minX + ($maxX - $minX) * $viewer->getViewPortLeft();
$xScaleMax = $minX + ($maxX - $minX) * ($viewer->getViewPortLeft() +
$viewer->getViewPortWidth());
$yScaleMax = $maxY - ($maxY - $minY) * $viewer->getViewPortTop();
$yScaleMin = $maxY - ($maxY - $minY) * ($viewer->getViewPortTop() +
$viewer->getViewPortHeight());
# Set the axis scales
$c->xAxis->setLinearScale($xScaleMin, $xScaleMax);
$c->yAxis->setLinearScale($yScaleMin, $yScaleMax);
# By default, ChartDirector will round the axis scale to the tick position. For zooming, we
# want to use the exact computed axis scale and so we disable rounding.
$c->xAxis->setRounding(false, false);
$c->yAxis->setRounding(false, false);
}
# Create the image and save it in a temporary location
$chartQuery = $c->makeSession($viewer->getId());
# Include tool tip for the chart
$imageMap = $c->getHTMLImageMap("", "",
"title='[{dataSetName}] Alpha = {x|G}, Beta = {value|G}'");
# Set the chart URL, image map, and chart metrics to the viewer
$viewer->setImageUrl("getchart.php?".$chartQuery);
$viewer->setImageMap($imageMap);
$viewer->setChartMetrics($c->getChartMetrics());
}
# Create the WebChartViewer object
$viewer = new WebChartViewer("chart1");
if ($viewer->isPartialUpdateRequest()) {
# Is a partial update request (AJAX chart update)
processPartialUpdate($viewer);
# Since it is a partial update, there is no need to output the entire web page. We stream the
# chart and then terminate the script immediately.
print($viewer->partialUpdateChart());
exit();
} else if ($viewer->isFullUpdateRequest()) {
# Is a full update request
processFullUpdate($viewer);
} else {
# Is a initial request
createFirstChart($viewer);
}
?>
ChartDirector Zoom and Scroll Demonstration (2)