I have made a lazyrow (horizontal) scroll with 10 items. My problem now is that when I scroll to item number 10, it stops. And I want it to go back to item number 1 again like a carousel. Does anyone know this? Here is my code for the 10 items:
//Horizontal Scroll view
item {
LazyRow {
items(10) { count->
Card(
modifier = Modifier
.width(110.dp)
.height(140.dp)
.padding(10.dp, 5.dp, 5.dp, 0.dp)
.clip(RoundedCornerShape(10.dp))
.background(Color.White),
elevation = 5.dp
) {
Column(
modifier = Modifier.padding(5.dp),
horizontalAlignment = Alignment.CenterHorizontally,
verticalArrangement = Arrangement.Center
) {
Image(
painter = painterResource(id = hi.imageId),
contentDescription = "profile Image",
contentScale = ContentScale.Crop,
modifier = Modifier
.size(60.dp)
.clip(CircleShape)
)
Spacer(modifier = Modifier.padding(5.dp))
Text(
text = hi.talk,
color = Color.Black,
fontWeight = FontWeight.Bold,
fontSize = 16.sp)
}
}
}
}
}
I'm pretty new to kotlin, so it is taking some fair time to learn. I couldn't find anything related to this in Jetpack Compose, and it is hard for me to convert from Java.
Using the Blazor.ChartJs library, I have a series of horizontal stacked bar charts, the purpose of which is to show the percentage complete. The red portion is the yearly goal and the blue is actual number achieved so far:
The first chart could have a goal of $10,000,000, the second $3,000,000, the third $7,000,000, etc. But I would like each chart to expand to the end of the table cell in which it is contained because I don't care about the numbers, just the percentages:
As you can tell in the first chart, the numbers are stopping before the end of the cell. I am adding the charts to HTML table cells, one for each statistic I'm tracking:
<table>
<tbody>
<tr>
<td></td>
<td>% Complete</td>
</tr>
#for (int i = 0; i < typeOfProject.Count; i++)
{
<tr>
<td><Chart Config="_configs[i]" Height="8" /></td>
<td>#String.Format("{0:P0}", percentagesComplete[i])</td>
</tr>
}
</tbody>
</table>
I build the _configs collection using a method that returns a BarConfig options, and the configurations are identical for all charts. I have experimented with the Responsive and MaintainAspectRatio properties, but this does not seem to affect the results.
config = new BarConfig
{
Options = new BarOptions
{
MaintainAspectRatio = true,
Responsive = true,
Legend = new Legend
{
Display = false
},
Scales = new BarScales
{
XAxes = new List<CartesianAxis>
{
new BarLinearCartesianAxis
{
Stacked = true,
OffsetGridLines = false,
Offset = false,
Display = AxisDisplay.False
}
},
YAxes = new List<CartesianAxis>
{
new BarCategoryAxis
{
Stacked = true,
OffsetGridLines = false,
Offset = false,
Display = AxisDisplay.False,
BarThickness = 45
}
}
}
}
I have also add a div tag around the Canvas object in each cell as mentioned in this question, but that wasn't the solution to my problem.
How can I expand the bars to the end of the canvas in each cell?
I created my own code to do this because I could not get the chart width to consistently expand to the end of the table cell. The requirements changed slightly as well, so I needed to draw an empty rectangle representing 100% of the goal and then filling the rectangle with a percentage of how complete the goal was.
First, I have a JavaScript method that gets the width of the canvas, calculates how many pixels to draw based on that width and the "value" variable (which is a percentage), then uses the context to first draw a clear rectangle. It draws a filled rectangle representing the progress to the goal:
function buildCanvas(canvasId, value) {
var canvasWidth = document.getElementById(canvasId).offsetWidth;
var calculatedWidth = parseInt(canvasWidth * value);
var canvasToDraw = document.querySelector('#' + canvasId);
const ctx1 = canvasToDraw.getContext('2d');
ctx1.clearRect(0, 0, 300, 150);
ctx1.fillStyle = 'rgba(173, 116, 76, 1.0)';
ctx1.fillRect(0, 0, calculatedWidth, 150);
}
I define the chart that I want to draw:
<canvas id="chart" style="border: 1px solid #AD744C; height: 18px; width: 300px">
I then inject IJSRuntime and call the JavaScript method to draw the rectangle, the value being the goal divided by the value to get a percentage:
#inject IJSRuntime JsRuntime
...
JsRuntime.InvokeAsync<string>("buildCanvas", $"chart", $"{value}");
In this list, I want to display out all the items that contains this specific name.
My list items: ['US', 'SG', 'US']
print(list.contains("US"));
Using .contains() returns me a true or false but it doesn’t return me the list of strings that contains that. I want to only extract out the items that has 'US' from the list. In this case, there's 2 of it. Please help!
You can try doing it the following way -
List<String> myList = ['US', 'SG', 'US'];
print(myList.where((item) => item.contains("US")));
You can also display it directly inside a Text widget in the following way -
Text(
myList.where((item) => item.contains("US")).join(" "),
//The join function joins the elements of the Iterable into a single string with the separator provided as an argument.
),
Hope this helps!
UPDATE:
To display each of the word separately as a list you can display them inside a Column in the following way -
Column(
children: myList.map((value) {
if(value.contains("US")){
return Text(value,);
} else {
return Container();
//Return an empty Container for non-matching case
}
}).toList(),
)
The same thing can be used inside a ListView instead of Column if you want it to be scrollable.
Something like this?
var myList = ['US', 'SG', 'US'];
myList.forEach((w){
if(w == "US")
print(w);
});
To show:
class SO extends StatelessWidget {
var myList = ['US', 'SG', 'US'];
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
mainAxisSize: MainAxisSize.min,
children: myList.where((w) => w == "US").map((w) => Text(w)).toList(),
),
);
}
}
or for a single line display use, Text instead of Column widget mentioned above
Text(myList.where((w) => w.contains("US")).join(" "))
If you are using "list.contains". It will only show the list exist or not , If you want to print the value you have to use follow :
var fruits = [‘banana’, ‘pineapple’, ‘watermelon’];fruits.forEach((fruit) => print(fruit)); // => banana pineapple watermelon
If you want to print just banana then you can use this
var fruits = [‘banana’, ‘pineapple’, ‘watermelon’];fruits.(fruit) => print(fruit[0]); // => banana
I was wondering how I can make a simple bar chart that perhaps has day as the x-axis, with values 'today' and 'yesterday', and the y-axis as perhaps 'time' with corresponding values '1' and '2'. I guess I'm confused as to how to set text as the values for the x-axis, how to show the y axis, and what exactly r.g.axis does...
(I found an example using axis = r.g.axis(0,300,400,0,500,8,2) and I only know it's the xpos, ypos,width, ??, ?? num ticks, ??). Any insight would be great! Or a page with more fully featured bar chart examples (labels, etc). Thanks.
For the sake of all those googling this:
r.g.axis(x_start, y_start, x_width, from, to, steps, orientation, labels, type, dashsize)
x_start and y_start: distance of the axis text from the bottom left corner
x_width: position of the end of the text along the x axis
from and to: used to specify and range to use instead of using the labels argument
steps: is the number of ticks - 1
orientation: seems to specify x-axis vs. y-axis
type: is the type of tick mark used.
This was all deduced from the source code. I think I'll be switching to a charting library with documentation now...
The current code (Raphaeljs 2.0) has changed and has to be slightly adapted to use Raphael.g.axis instead of r.g.axis:
Raphael.g.axis(85,230,310,null,null,4,2,["Today", "Yesterday",
"Tomorrow", "Future"], "|", 0, r)
You're on the right track. You use g.axis and the positional arguments for setting the text is found in the 'text' arg (positional) and for toggling the y using the 'orientation' args. I added an example here,
Barchart with text x-axis
Reading this Q&A and a dozen like it, I still could not get gRaphaël to show proper labels for a bar chart. The recipes all seemed to refer to older versions of the library, or to github pages that are no longer there. gRaphaël produces some great looking output--but its docs leave much to be desired.
I was, however, able to use a combination of Firebug and Inspect This Element to follow the code and see what it produced. Diving into the barchart object, the required geometry is right there. To save others the frustration, here's how I solved the problem:
<script>
function labelBarChart(r, bc, labels, attrs) {
// Label a bar chart bc that is part of a Raphael object r
// Labels is an array of strings. Attrs is a dictionary
// that provides attributes such as fill (text color)
// and font (text font, font-size, font-weight, etc) for the
// label text.
for (var i = 0; i<bc.bars.length; i++) {
var bar = bc.bars[i];
var gutter_y = bar.w * 0.4;
var label_x = bar.x
var label_y = bar.y + bar.h + gutter_y;
var label_text = labels[i];
var label_attr = { fill: "#2f69bf", font: "16px sans-serif" };
r.text(label_x, label_y, label_text).attr(label_attr);
}
}
// what follows is just setting up a bar chart and calling for labels
// to be applied
window.onload = function () {
var r = Raphael("holder"),
data3 = [25, 20, 13, 32, 15, 5, 6, 10],
txtattr = { font: "24px 'Allerta Stencil', sans-serif", fill: "rgb(105, 136, 39)"};
r.text(250, 10, "A Gratuitous Chart").attr(txtattr);
var bc = r.barchart(10, 10, 500, 400, data3, {
stacked: false,
type: "soft"});
bc.attr({fill: "#2f69bf"});
var x = 1;
labelBarChart(r, bc,
['abc','b','card','d','elph','fun','gurr','ha'],
{ fill: "#2f69bf", font: "16px sans-serif" }
);
};
</script>
<div id="holder"></div>
There are a bunch of little cleanups you could do to labelBarChart(), but this basically gets the job done.
Here's a function I wrote for adding the labels. It's not particularly elegant but it will add the labels:
Raphael.fn.labelBarChart = function(x_start, y_start, width, labels, textAttr) {
var paper = this;
// offset width and x_start for bar chart gutters
x_start += 10;
width -= 20;
var labelWidth = width / labels.length;
// offset x_start to center under each column
x_start += labelWidth / 2;
for ( var i = 0, len = labels.length; i < len; i++ ) {
paper.text( x_start + ( i * labelWidth ), y_start, labels[i] ).attr( textAttr );
}
};
Usage is as follows:
var paper = Raphael(0, 0, 600, 400);
var chart = paper.barchart(0, 0, 600, 380, [[63, 86, 26, 15, 36, 62, 18, 78]]);
var labels = ['Col 1', 'Col 2', 'Col 3', 'Col 4', 'Col 5', 'Col 6', 'Col 7', 'Col 8'];
paper.labelBarChart(0, 390, 600, labels, {'font-size': 14});
I would like to propose a solution of an issue of the labelBarChart function proposed by Jonathan Eunice.
considering stacked bar-graphes (or other bar-graphes with more than one array of values), I added a test on bc.bars[0] in case the bc.bars.length means the number of arrays of values stacked.
This lead to the code :
<script>
function labelBarChart(r, bc, labels, attrs) {
// Label a bar chart bc that is part of a Raphael object r
// Labels is an array of strings. Attrs is a dictionary
// that provides attributes such as fill (text color)
// and font (text font, font-size, font-weight, etc) for the
// label text.
//Added test : replace bc.bars by generic variable barsRef
var barsRef = (typeof bc.bars[0].length === 'undefined') ? bc.bars : bc.bars[0];
var bar, gutter_y, label_x, label_y, label_text;
//Added consideration of set attrs (if set)
var label_attr = (typeof attrs === 'undefined') ? {} : attrs;
label_attr['fill'] = (typeof label_attr['fill'] === 'undefined') ? "#2f69bf" : label_attr['fill'];
label_attr['font'] = (typeof label_attr['font'] === 'undefined') ? "16px sans-serif" : label_attr['font'];
for (var i = 0; i<barsRef.length; i++) {
bar = barsRef[i];
gutter_y = bar.w * 0.4;
label_x = bar.x
label_y = bar.y + bar.h + gutter_y;
label_text = labels[i];
r.text(label_x, label_y, label_text).attr(label_attr);
}
}
// what follows is just setting up a bar chart and calling for labels
// to be applied
// I added an array of data to illustrate : data4
window.onload = function () {
var r = Raphael("holder"),
data3 = [25, 20, 13, 32, 15, 5, 6, 10],
data4 = [0, 2, 1, 40, 1, 65, 46, 11],
txtattr = { font: "24px 'Allerta Stencil', sans-serif", fill: "rgb(105, 136, 39)"};
r.text(250, 10, "A Gratuitous Chart").attr(txtattr);
var bc = r.barchart(10, 10, 500, 400, [data3, data4] {
stacked: true,
type: "soft"});
bc.attr({fill: "#2f69bf"});
labelBarChart(r, bc,
['abc','b','card','d','elph','fun','gurr','ha'],
{ fill: "#2f69bf", font: "16px sans-serif" }
);
};
</script>
<div id="holder"></div>
I just tested it with 2 arrays of values stacked.