Teardown of charts in TradeRepublic App
I wanted to know how TradeRepublic made their charts and so I replicated it.
I came real close and even was able to improve the original, my key takeaways are:
- A chart is nothing more than scaled points connected by a line.
- Using a
CABasicAnimationto morph a
CGPathis very smooth. By doing so almost the entire animation comes for free.
- The animation benefits a lot from start drawing the chart from the right combined with proportional numbers of points.
- Interaction can be broken down into three steps. The most complicated part is to get the point next to the users finger and even that is straight foreward.
- Accessibility is nothing that takes care of itself! This entire demo is missing accessibility adjustments in order to focus on the main visuals.
- UIKit and CoreAnimation are just awsome frameworks
MIT License Copyright (c) 2019 Andreas Neusuess Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.