![]() Drawingĭrawing is implemented in CircleColorPickerView#onDraw(Canvas). When the user has completed the selection of a new color using the RGB color picker interactor, the application will change the color displayed on the screen behind the wheel. While the thumb is moving it is 50% opaque, and it will return to 100% opaque as soon as the user lifts their pointer from the screen and a new color is selected. The user interacts with this thumb by pressing down on it, then rotating it around the wheel. The RGB color picker works as follows: There is a small white “thumb” that marks the color currently indicated on the dial (the outer rim of the color picker), and that indicated color is displayed in the inner circle of the color wheel. Important definition: The term wheel used throughout the spec refers to the dial and inner circle it is the larger circle that contains all interface you will be drawing. Implementing your color picker interactor will require you to support input handling, maintaining and mutating state, and drawing to the screen in CircleColorPickerView.java. Part 1: Creating your Circle Color Picker To understand parts of the assignment that seem tricky. We are showing the absolute minimum necessary for M圜olorPickerView.ĪppCompatActivity <|- AbstractMainActivityĪppCompatImageView <|- AbstractColorPickerViewĪbstractColorPickerView <|- ColorPickerViewĬolorPickerView <|- CircleColorPickerView Is must be overridden in the child class. Any method that is in italics is an abstract method, meaning The symbols can be read as follows: + is a public field or method, # The structure of the code is represented by theĭiagram shown below. Where applicable, you must use the inherited variables and functions (do not overload the inherited functions). Read the abstract base classes, including all of the comments in AbstractColorPicker.java and AbstractMainActivity.java before you begin. As such it is important to understand the inheritance chains of these two files, as you will be using a lot of variables and functions defined in both these and parent classes. You will be editing ColorPickerView, CircleColorPickerView, M圜olorPickerView and MainActivity. How the custom interactor communicates with an application. Note: We will be asking you to re-use your color picker ( CircleColorPickerView and ColorPickerView) in a later assignment so it is important that you understand Inherits from AbstractMainActivity which must remain untouched. This is yourĪpplication which will use your custom color picker interactor.
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