Remove the tick bar on flot charts - javascript

Is it possible to remove the tick bars on the x and y axis on a flot chart?
picture of what I currently have
I want to remove the gray bar between the two series labels

Have you tried to configure your axes like:
xaxis: {
tickLength: 0
}
yaxis: {
tickLength: 0
}
Reference here.
Update in response to your last comment
Since there is no such option one possible workaround could be to color the tickbar the same as your chart background and the ticks like you have it right now.
xaxis: {
color: /* same as your background color */
tickColor: /* different color, like the grayish one you have for the ticks */
}
yaxis: {
color: /* same as your background color */
tickColor: /* different color, like the grayish one you have for the ticks */
}
Hope it helps

I ended up changing the flot source code to allow this to occur.
Here's what I did.
1) added 'tickBar' to the x/yaxis options. (if true, tickBar is shown.. default: true)
2) change the drawGrid function to use this option
drawGrid()
...
//draw the ticks
axes = allAxes();
bw = options.grid.borderWidth;
xBar = (options.xaxis.tickBar !== undefined)? options.xaxis.tickBar:true; //new
yBar = (options.yaxis.tickBar !== undefined)? options.yaxis.tickBar:true; //new
...
if(!axis.innermost){
ctx.strokeStyle = axis.options.color;
ctx.beginPath();
xoff = yoff = 0;
if(axis.direction == "x"){
if(xBar) //new
xoff = plotWidth + 1; // new
} else {
if(yBar) //new
yoff = plotHeight + 1; //new
}
When tickBar is set to false, the offset remains 0 so the line is drawn with a 0 value for width/height so it is not seen.

Related

drawing multi colored custom symbols in highcharts

I need to draw custom markers on a highchart at particular intervals.
I have managed to create a custom bar using the following javascript:
Highcharts.Renderer.prototype.symbols.hline =
function(x, y, width, height) {
return ['M',x-30 ,y + height / 2,'L',x+width+30,y + width / 2];
};
https://jsfiddle.net/jimmain/9gqca584/5/
My problem is that I need to also draw a single pixel border around the pink box.
I am using a stacked bar chart for the chart.
Ideally I would also like to increase the padding underneath the bar (between the bar and the x-axis) but I am not sure it can be independently increased.
It's not clear to me how I can use the renderer to change color. I could just draw one black box, and then another smaller inset pink box on top, but I am not clear on how to change colors in the SVG renderer.
SVG's path can not have border, so solution is to use renderer.rect(): https://jsfiddle.net/BlackLabel/9gqca584/43/
Note: It's bar series, so chart is inverted, that means we need to swap x with y and height with width.
Snippet:
function addRect(chart) {
return chart.renderer.rect(
chart.yAxis[0].toPixels(5) - 4, // 4 = half width
chart.xAxis[0].toPixels(0),
8,
5
).attr({
fill: 'rgba(253,0,154,0.9)',
stroke: 'black',
'stroke-width': 2,
zIndex: 5
}).add();
}
function positionRect(chart, rect) {
rect.animate({
x: chart.yAxis[0].toPixels(5) - 4, // 4 = half width
y: chart.xAxis[0].toPixels(0) - chart.series[0].points[0].pointWidth / 2,
height: chart.series[0].points[0].pointWidth
});
}
$(function() {
$('#container').highcharts({
legend: {
enabled: false
},
chart: {
type: 'bar',
events: {
load: function() {
this.customRect = addRect(this);
positionRect(this, this.customRect);
},
redraw: function() {
positionRect(this, this.customRect)
}
}
},
...
});
});

How to make the color in bar chart of Highstock look like in candlestick chart?

Can volume chart's color same as the candlestick's color above?
I tried give a color list in series with the
colors: ['red', 'red', 'green', ...]
colorByPoint: true
Highstock source code:
init: function (series, options, x) {
var point = this,
colors;
point.series = series;
point.color = series.color; // #3445
point.applyOptions(options, x);
point.pointAttr = {};
if (series.options.colorByPoint) {
colors = series.options.colors || series.chart.options.colors;
point.color = point.color || colors[series.colorCounter++];
// loop back to zero
if (series.colorCounter === colors.length) {
series.colorCounter = 0;
}
}
series.chart.pointCount++;
return point;
}
But it did not work, because not all the points in the current screen at the same time, but the volume chart's color list is.
I did this all night,Can somebody help me?

Flot Thresholds on x-axis

I created a realtime (updates every 10ms) vertical spline chart using Flot. The chart can be seen here on Codepen. I included the Flot multiple threshold plugin, but I would like for the thresholds to use the x-axis values (on the bottom of the vertical chart) and not the y-axis values (left of the chart). The plot would then paint all values outside of the dashed black lines in red.
In the example you can see that the thresholds use the y-axis to color thresholds (in my case, all values below constraintMax, which is 60).
The operative lines of code are where I set up the options (line 79 in the update function):
var options = {
xaxis: {
position: 'bottom',
min: -10,
max: 100
},
yaxis: {
position: 'left',
min: iterator,
max: updatedData.length-1+iterator,
transform: function (v) { return -v; },
inverseTransform: function (v) { return -v; }
}
};
Where I set up the constraints (line 66 in the update function):
var constraintMax = {
threshold: 60,
color: "rgb(255,0,0)",
evaluate : function(y,threshold){ return y < threshold; }
}
var constraintMin = {
threshold: 25,
color: "rgb(255,0,0)",
evaluate : function(y,threshold){ return y < threshold; }
}
And where I actually plot (line 93 in the update function):
$.plot("#"+elementID, [{data: updatedData, constraints: [constraintMin, constraintMax]}, {data: initialMinData, color: "#000000", dashes: { show: true }}, {data: initialMaxData, color: "#000000", dashes: { show: true }}], options);
Does anyone have any ideas on how to paint the plot points that are outside of the dashed lines red? Thank you in advance.
The multiple threshold plugin only support y-value thresholds out of the box. Therefore you have to change it for your plot. I copied the code into a jsfiddle (I don't like codepen) and changed it there.
1) Your constraintMax threshold is wrong for what you want to do, you need return y > threshold.
2) Changes in the multiple threshold plugin:
if (evaluate(currentPoint[1], threshold)) {
v
if (evaluate(currentPoint[0], threshold)) {
and
function _getPointOnThreshold(threshold, prevP, currP) {
var currentX = currP[0];
var currentY = currP[1];
var prevX = prevP[0];
var prevY = prevP[1];
var slope = (threshold - currentX) / (prevX - currentX);
var yOnConstraintLine = slope * (prevY - currentY) + currentY;
return [threshold, yOnConstraintLine];
}
See the fiddle for the working example.

Highcharts: Add circle to scatter plot

I would like to draw a circle on a scatter plot to highlight values outside of the acceptable range.
I tried to use chart.renderer.circle but that uses the x and y pixels of the SVG element. I still want to be able to zoom in or out, so absolute x and y values don't work.
Is this possible with Highchart?
Edit:
Added Mockup:
Two ideas...
ONE
Use chart.renderer.circle and translate the point values to pixels.
Say you want to draw a circle at:
var circleX = 161.2; // x coordinate
var circleY = 51.6; // y coordinate
var circleR = 1.0; // radius size in terms of x axis distance
Draw the circle as:
function addCircle(chart){
if (this.circle){
// on a redraw, remove old circle
$(this.circle.element).remove();
}
// translate my coordinates to pixel values
var pixelX = chart.xAxis[0].toPixels(circleX);
var pixelY = chart.yAxis[0].toPixels(circleY);
var pixelR = chart.xAxis[0].toPixels(circleR) - chart.xAxis[0].toPixels(0);
// add my circle
this.circle = chart.renderer.circle(pixelX, pixelY, pixelR).attr({
fill: 'transparent',
stroke: 'black',
'stroke-width': 1
});
this.circle.add();
}
You then call this in the load and redraw events and all is awesome:
events: {
load: function(){
addCircle(this);
},
redraw: function(){
addCircle(this);
}
}
Here's a fiddle example.
TWO
Add the circle as another series, make the marker a giant transparent circle:
{
data: [[circleX, circleY]],
linkedTo: 'other', // link it to other series to avoid legend entry
marker: {
radius: 40,
lineColor: 'red',
fillColor: 'transparent',
lineWidth: 1,
symbol: 'circle'
}
}
Here's a fiddle for this one.

How to remove the y axis ticks in flot

I am using flot to generate bar graphs.
Here is my code bar graph code
I need to make the y axis tick to disappear.
I need to put some label on the top of each bar
How to do it?
Okay, after a lot of mucking around with Flot and downloading the source, I finally figured out a good starting point for you.
The jsFiddle demo is here.
The guts of the code is using a hook for drawSeries which draws the label:
function drawSeriesHook(plot, canvascontext, series) {
var ctx = canvascontext,
plotOffset = plot.offset(),
labelText = 'TEST', // customise this text, maybe to series.label
points = series.datapoints.points,
ps = series.datapoints.pointsize,
xaxis = series.xaxis,
yaxis = series.yaxis,
textWidth, textHeight, textX, textY;
// only draw label for top yellow series
if (series.label === 'baz') {
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
ctx.lineWidth = series.bars.lineWidth;
ctx.fillStyle = '#000'; // customise the colour here
for (var i = 0; i < points.length; i += ps) {
if (points[i] == null) continue;
textWidth = ctx.measureText(labelText).width; // measure how wide the label will be
textHeight = parseInt(ctx.font); // extract the font size from the context.font string
textX = xaxis.p2c(points[i] + series.bars.barWidth / 2) - textWidth / 2;
textY = yaxis.p2c(points[i + 1]) - textHeight / 2;
ctx.fillText(labelText, textX, textY); // draw the label
}
ctx.restore();
}
}
See the comments for where you can customise the label.
To remove the y-axis ticks, that is just a simple option setting. In addition, you can work out the maximum y-value for each of the bar stacks and then add about 100 to that to set a maximum Y value that will allow for the space taken up by the labels. The code for all of that then becomes:
// determine the max y value from the given data and add a bit to allow for the text
var maxYValue = 0;
var sums = [];
$.each(data,function(i,e) {
$.each(this.data, function(i,e) {
if (!sums[i]) {
sums[i]=0;
}
sums[i] += this[1]; // y-value
});
});
$.each(sums, function() {
maxYValue = Math.max(maxYValue, this);
});
maxYValue += 100; // to allow for the text
var plot = $.plot($("#placeholder"), data, {
series: {
stack: 1,
bars: {
show: true,
barWidth: 0.6,
},
yaxis: {
min: 0,
tickLength: 0
}
},
yaxis: {
max: maxYValue, // set a manual maximum to allow for labels
ticks: 0 // this line removes the y ticks
},
hooks: {
drawSeries: [drawSeriesHook]
}
});
That should get you started. You can take it from here, I'm sure.

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