When using the Kendo Dataviz, chart I need to have the crosshair stick, and to be calibrated between plot points on the category axis.
On the hover over the crosshair will lose stickiness, and always aligns to gridline, with the below code:
var chart = $("#" + d.obj_map[objId].upstream).data("kendoChart");
var hair = chart._plotArea.crosshairs[0];
hair.stickyMode = true;
The other problem with the crosshair is to able to set it between plot... So I though drawing my own crosshair on the chart.
var m = hair.linePoints();
var opt = hair.options;
opt.zIndex = 100;
var view = chart._view.createLine(m[0].x, m[0].y, m[1].x, m[1].y, opt);
var jk = view.renderPoints();
neither one is working properly. Does anyone know how to draw custom lines on Kendo chart?
Related
I'm not sure how to flip the axes of my chart. Below is the code I'm using.
Please see also the picture on how it looks right now. Instead of drawing the data vertically I'd like to show it horizontally. It suppose to look like a stock chart because that is what it actually is. I'm using YQL to get the historical data of the symbol as Json format.
I also see the data is scooped in the whole screen. I'd like to see the last month for example and just allow the user to swipe to the right for more or just to zoom out.
I'd appreciate some help.
float vals=0;
String[] resultStrs = new String[StockHistoryArray.length()];
for (int i = 0; i < StockHistoryArray.length(); i++) {
JSONObject chartDataObj = StockHistoryArray.getJSONObject(i);
yVals.add(new Entry(vals,(int) Float.parseFloat(chartDataObj.getString("Adj_Close")),i+1));
xVals.add(i, String.valueOf(vals));
vals++;
}
LineDataSet setting = new LineDataSet(yVals, "Stock Chart");
ArrayList<ILineDataSet> dataSets = new
ArrayList<ILineDataSet>();
dataSets.add(setting);
LineData data = new LineData(xVals, dataSets);
lineChart.setData(data);
Legend l = lineChart.getLegend();
l.setForm(Legend.LegendForm.LINE);
l.setTextColor(Color.WHITE);
XAxis x1 = lineChart.getXAxis();
x1.setTextColor(Color.WHITE);
x1.setDrawGridLines(false);
x1.setAvoidFirstLastClipping(true);
YAxis y1 = lineChart.getAxisLeft();
y1.setTextColor(Color.WHITE);
y1.setAxisMaxValue(120f);
y1.setDrawGridLines(true);
return null;
Here is the screen shot after I run this code. It is one year history.
screen capture
You are doing wrong in the following line.
yVals.add(new Entry(vals,(int) Float.parseFloat(chartDataObj.getString("Adj_Close")),i+1));
Use like this to draw the chart correctly
yVals.add(new Entry(entryVal,entryXIndex);
If your value in chartDataObj.getString("Adj_Close")
then you need to add like this
yVals.add(new Entry(Float.parseFloat(chartDataObj.getString("Adj_Close")), i);
I am beginning to use snap.svg, and stuck in a probably simple question. I draw a circle, and want to let the user drag it around, and when the user stops dragging, I want to know the alert the final position of the circle.
I started with this:
var s = Snap("#svg");
var d = s.circle(20,20,5);
Then I created the following functions as drag event-handlers; I only need the drag-end event so I made the two other event-handlers null:
var endFnc = function(e) {
alert("end: "+e.layerX+","+e.layerY);
}
var startFnc = null;
var moveFnc = null;
Then I installed the drag event handlers:
d.drag(moveFnc,startFnc,endFnc);
Whenever I tried to drag a circle, the end event fired, but, the circle did not move.
So I figured maybe I have to also create the drag move event (although I don't need it):
var moveFnc = function(dx, dy, x, y) {
this.transform('t' + x + ',' + y);
}
Now the circle did move, but, not exactly at the mouse, but approximately 20 pixels at its bottom right.
I read the documentation here: http://snapsvg.io/docs and there seems to be no explanation about how to create working drag events.
How does anyone get this knowledge?!
After struggling for some hours to do this with snap.js, I finally discovered svg.js and its draggable plugin, with which it is so much easier:
var draw = SVG('svg');
var circle = draw.circle(10).attr({cx:30,cy:30,fill:'#f06'});
circle.dragend = function(delta, event) {
alert(this.attr('cx'))
}
circle.draggable();
So, I switched to svg.js ...
I'm using Flot Charts with mouse scroll to zoom in and out. I created a button to call zoomOut() and it works well, but I can't find any solution to how I can zoom out all the way so that it Looks just like when it was first loaded. I don't want to reload that who container because it using ajax to pull data from mysql on refresh.
I Googled but couldn't find anything.
You can also set a double click to reset the zoom function of the Flot chart. It redraws the Flot chart to its original state and can be used with dynamic data.
$("#placeholder").dblclick(function () {
plot = $.plot(placeholder, dataset, options);
});
You can set the ranges of the axes to null. By setting this, the zoom level will be set so every data point is visible, just like the default zoom level.
Unlike the other solutions, this solution will not construct a whole new plot.
var axes = plot.getAxes(),
xaxis = axes.xaxis.options,
yaxis = axes.yaxis.options;
xaxis.min = null;
xaxis.max = null;
yaxis.min = null;
yaxis.max = null;
// Don't forget to redraw the plot
plot.setupGrid();
plot.draw();
You can save your initial ranges of axes and redraw your plot like in example for navigating. But your code will be look like these:
// do the zooming
plotObjectPointer = $.plot(placeholder, plotData,
$.extend(true, {}, options, {
xaxis: { min: ranges.xaxis.from, max: ranges.xaxis.to },
yaxis: { min: ranges.yaxis.from, max: ranges.yaxis.to }
}));
where ranges will be your initial ranges. To prevent repeated Ajax loading you can use window.localStorage or just another var for storing plotData.
I m using fabric.js in one of my projects.
I m using zooming functionalities . I would like to know if there a simple way to zoom all the canvas (with all the elements ) in on click.
Try out this jsfiddle demonstrating zoom onclick of a button: http://jsfiddle.net/cmontgomery/H7Utw/1/. In essence you get all objects on the canvas and scale/move them by the same factor, giving the visual appearance of zoom.
var objects = canvas.getObjects();
for (var i in objects) {
var scaleX = objects[i].scaleX;
var scaleY = objects[i].scaleY;
var left = objects[i].left;
var top = objects[i].top;
var tempScaleX = scaleX * SCALE_FACTOR;
var tempScaleY = scaleY * SCALE_FACTOR;
var tempLeft = left * SCALE_FACTOR;
var tempTop = top * SCALE_FACTOR;
objects[i].scaleX = tempScaleX;
objects[i].scaleY = tempScaleY;
objects[i].left = tempLeft;
objects[i].top = tempTop;
objects[i].setCoords();
}
canvas.renderAll();
If you use zoom with fabricjs without modifying all objects use: https://github.com/wojtek-krysiak/fabricjs-viewport.
Example: http://wojtek-krysiak.github.io/fabricjs-viewport/
I have stacked bar chart in which the number of columns is dynamic, can change from 1 to n columns. I want the spacing between the charts and width of the bar to be consistent. How do I fix it. Please suggest solutions / ideas.
In a Stacked Bar chart, you can change the spacing between bars using
CategoryAxis.setLowerMargin
CategoryAxis.setMargin and
CategoryAxis.setUpperMargin
Code is below
protected JFreeChart generateGraph() {
CategoryAxis categoryAxis = new CategoryAxis("Categories");
categoryAxis.setLowerMargin(.01);
categoryAxis.setCategoryMargin(.01);
categoryAxis.setUpperMargin(.01);
categoryAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_90);
ValueAxis valueAxis = new NumberAxis("Values");
StackedBarRenderer renderer = new StackedBarRenderer();
renderer.setBarPainter(new StandardBarPainter());
renderer.setDrawBarOutline(false);
renderer.setShadowVisible(false);
renderer.setBaseItemLabelsVisible(true);
renderer.setBaseItemLabelGenerator(new StandardCategoryItemLabelGenerator());
CategoryPlot plot = new CategoryPlot( _dataset,
categoryAxis,
valueAxis,
renderer);
plot.setOrientation(PlotOrientation.VERTICAL);
JFreeChart chart = new JFreeChart( "Title",
JFreeChart.DEFAULT_TITLE_FONT,
plot,
true);
//ChartFactory.getChartTheme().apply(_chart);
return chart;
}
StackedBarRenderer devotes some effort to making the "spacing between the [bars] and width of the bar to be consistent." It's not clear what you want it to do differently as the number of columns changes. The relevant geometry is determined by the parent BarRenderer in such methods as calculateBarWidth(), which can be overridden as desired. Also, verify that there is a value for each category in each series.