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I'm going to create an iPad application to show and modify bar charts (where every bar is composed by a stack of little rectangles), so I'm evaluating chart frameworks Swift-compatible.
I started to evaluate CorePlot framework and it is a good candidate, supposing to import it in Xcode following this guide.
Although I already took a look to the available tutorials, I couldn't find anything for the following scenario:
draw a chart showing 24 bars representing data coming from a JSON string, obtained from a service call
vertically pan the top of a bar, so that such bar grows or decreases accordingly
send to the service the new MODIFIED data associated to the chart
Can anyone notify here a link to tutorials/guides for such a case, please?
Thanks
Core Plot doesn't care where the data comes from. It's up to the datasource to translate it to numeric values before passing them to the plot. JSON parsing is outside the scope of a plotting library like Core Plot.
I'm not sure what you're asking in #2. It's easy to update the plot with new data and resize the visible parts of the plot area to display it, but that's the responsibility of the controller object and the datasource.
Core Plot is for display only. Any interaction with external services is the responsibility of the controller object.
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I'm stuck on a problem and needed some help or guide for a possible solution.
Basically in my application there will be a map with several zones.
The user can select any of these areas, at that time this area is filled with a color.
Imagine a map like this one, so i need to be able to change the color of only one country.
Something like what happens in the books of paintings (https://itunes.apple.com/pt/app/colorfly-best-coloring-book/id1020187921?mt=8), or Paint Bucket command in the Photoshop .
Any idea how to get something like this on iOS ?
Thanks in advance
The paint bucket technique you're looking for is a set of graphics algorithms usually called "flood fill". There are different approaches to the implementation depending on the circumstances and performance needs. (There is more at that wikipedia link.)
I have no experience with it, but here is a library from GitHub that purports to implement this for iOS given a UIImage object: https://github.com/Chintan-Dave/UIImageScanlineFloodfill
Re: your question about doing this without user touch: yes, you'll want to keep a map of countries to (x,y) points so you can re-flood countries when required. That said, the intricacies of the county borders might make an algorithmic fill inexact without more careful normalization of the original source. If your overall map only contains a small set of possible states, there are other ways of achieving this goal, like keeping a complete set of possible images (created in ie Photoshop) and switching them out, or keeping a set of per-country "overlay" images that you swap in as needed. (But if the flood fill is accurate on that source image, and performant for your needs, then great.)
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I'm creating a message app in Swift to grasp the foundations of iOS app building and am trying to style the table view cells to look like this.
I've been following tutorials but I can't seem to piece it together. It's got to be pretty simple. Does anyone have a good tutorial that does this in Swift?
I don't have a tutorial but I can give you some suggestions.
An easy way to handle this is to create a stretchable image and install it as the background image for your cells.
A stretchable image has fixed corners/edges, and the system flood-fills the center with a solid color. You take an image like your speech bubble and pare it down to the smallest possible image (with a 1 point center) and then use the UIImage method resizableImageWithCapInsets: to turn it into a stretchable image.
You'd then install that stretchable image as the background image for your table view cells. If this is a chat app you might want several variants: one with the speaker's arrow pointing left, one with the speaker's arrow pointing right, and perhaps different colors.
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I am getting trouble with showing image on line chart at certain point on chart & also i wanted to implement curved line chart with customizable color, width & type (shown in dotted line in image) & labels at x axis & y axis.
I wanted to know is there any iOS libraries are available which provides this kind of implementation.
I know this is a duplicate question cause there are lot of questions are asked about charts for iOS but all I wanted to know is there is any library available there that can fulfill above requirement & save me lot of time for that implementation.
so far I got following libraries by doing search over google.
JBChartView
BEMSimpleLineGraph
PNchart
all off above provides line chart implementation but not curved line chart also have no provision for showing image on chart at specified point.
I am very new to chart in iOS so any help would be very much appreciated.
Thanks in advance.
Following lines can add image at given points(100,200), which will serve your purpose for drawing image.
I have developed a sample chart Library in which you will get what you need, kindly go through it. Download Library here
UIImage *image = [UIImage imageNamed:#"smiley.png"];
[image drawAtPoint:CGPointMake(100,200)];
I recommend SwiftCharts for this, it's specially designed for this kind of situations. You can add multiple layers on top of each other and generate custom views (UIView subclasses, which can be an image view or anything else) in any of these layers.
In this case you would add a layer with the curve and another layer on top of it with your custom overlays.
To produce the custom overlays you receive the complete state of each chart point, so for example you can decide if you display the image or not, or customize the image according to the chartpoint's data. See this example:
There the warning (called notifications in the example) overlays are shown only when the y value is less than 1.
There's also an example with curved line
You could use the curved line example as basis and copy-paste the notifications layer from notifications example to it and add to the chart's layers. Then customize accordingly.
(Disclosure: I'm the author)
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I was finding some good stuff for my app.
Actually i need to draw pie chart with animation if any one have an idea about it then please help me.
hi you can find many custom controls from www.cocoacontrols.com
here some examples like
1) https://www.cocoacontrols.com/controls/xypiechart
2) https://www.cocoacontrols.com/controls/sspieprogressview
3) https://www.cocoacontrols.com/controls/magicpie
you can use one of them as per your requirements.
For simple pie charts, Look at this open source project CERoundProgressView
You'll need to include these 4 files in your project:
CERoundProgressView.h and .m
CERoundProgressLayer.h and .m
See methods for displaying pie chart. You can edit animation duration and change background and track colors of pie chart as well..
Look at this framework CorePlot
It is a plotting framework for OS X and iOS. It provides 2D visualization of data, and is tightly integrated with Apple technologies like Core Animation, Core Data, and Cocoa Bindings.
and also you may find this tutorial useful.
you can try this tutorial link...
https://github.com/tildeio/OCD3
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I am trying to build an option in a application that let user see a map. This map must be editable, and tag enabled. It should also be possible to see sub regions in different colors, and highlight the one under the mouse.
TGlobe is good one, but hasn't updated since 2004, If you need more than showing a map, and build a GIS like application I suggest use one of these:
TatukGIS (very powerful GIS Components and writing as Native VCL).
CartoVCL.
MapObjects (the Leading GIS Company, but the components are ActiveX).
There used to be a component named TGlobe, which I've never used.
The website has not been up dated since 2009, and it is no longer available as of 2013.
TGlobe 5 is a VCL component for Delphi 5, 6, 7, 2005 plus CBuilder 5 and 6.
TGlobe displays a Globe of the Earth which can be rotated, panned and zoomed in realtime. The globe contains map data in the form of Point, Lines and Polygons.
TGlobe organises map data into Layers. These layers can be nested together to build up a hierachy of related layers.
TGlobe can switch between the 3D spherical view of the earth and Cartesian, Mercator or user defined projections.