Java lwjgl draw circle code#

We extend the JPanel class to be able to overwrite the paint method which is the method called by the AWT Engine to paint what appears in the screen. So first of the easiest way to do font handling is by just providing a NkUserFont struct which only requires the height in pixel of the used font and a callback to calculate the width of a string. To be able to paint we want to know WHERE and where is an JPanel object which will be included in the window. Further on we will see more about threads, meanwhile I am only interested that you remember the third thread we see in the debug view called 'Thread ' this thread is the one in charge of painting the screen and receiving the mouse and keyboard events. Each thread is as if it was an independent program running at the same time as the other threads. The AWT Engine starts several threads which can be seen if we start the aplication with debug and we go to the debug perspective. The problems come when both try to use the same frying pan at the same time. Two concurrent threads would be like two cooks working in the same kitchen, preparing one dish with the same recipe o with differents recipes. We can think that a thread is like a cook preparing a dish reading a recipe.

Java lwjgl draw circle code#

It is interesting to think that two threads can be running the same code at the same time.

This is as if, there were several processors running at the same time their own sequence of instructions.Įven though threads and concurrence are very powerful tools, there can be problems when two threads enter the same variables. Threads allow a program to start several executions at the same time. What is a thread in java?Ī program is executed by just one processor, line by line. In the first java versions only AWT existed and then Swing was added. You most definitely dont need and dont want to render a BufferedImage. You can perfectly render a quad and just use a fragment shader to do the color interpolation in order to render the current hue value interpolated over value and saturation from 0 to 1. In JavaFX a circle is represented by the class. A circle is defined by its center and radius distance from the center to any point on the circle. « Reply 1 on: January 06, 2020, 16:27:23 ». A circle is a line forming a closed loop, every point on which is a fixed distance from a center point. We will call this engine 'AWT Engine' or 'Swing Engine' because it is made by these two libraries. Re: Drawing an HSB color wheel with OpenGL.

This engine communicates with the operative system both to paint in the screen as to receive information from the keyboard and from the mouse. When we create a JFrame object we start an engine which manages the user interface. With these few instructions we will obtain a window which can be maximize, minimize, change it´s size with the mouse, etc. JFrame frame = new JFrame('Mini Tennis') įtDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) If we don´t include the last line 'tDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)', when we close the window the program won´t finish and will continue running. The window won´t be visible until we call setVisible(true). The following code creates a window 'Mini Tennis' of 300 pixels by 300 pixels.