Video: How to Draw a Speedometer in Java. Hello, my name is Josiah Rea, I'm going to show you how to draw a speedometer using Java. So, here I am inside of Net. Beans, and this is my speedometer project. And design wise, it's just a form with a panel on top of it. And the panel's basically just a box that I'm going to use to draw the speedometer inside. All of the real action happens over here in the Code Panel.
So, you can see right here, I've got sort of an Event Listener for when somebody clicks on the panel, and that's the code that we're going to use to kick off this drawing. It's not very complicated, as you can see, it's mostly just a lot of draw commands preceded by color changes, to kind of mix things up a little bit. So, the first thing that we do is, we define the graphics variable G. And I'm just setting that to the panel, which I left as the default name, J Panel Dot Get Graphics (j.
Panell. get. Graphics), that's the command to get the graphics variable of the panel and I'm setting it over to my own variable. So that I can use it whenever I want, instead of having to write that whole, long line out every time. So, first what we're going to do is, we're going to fill this arc, which is basically is the Backlight of the dial.
And these coordinates are relating to where you're going to start with the center of this little arc is in. And arc is basically a circle that's been cut into a pie slice. And so, this is where you're going to start drawing the circle, how big the radius of the circle is going to be ,both the height and the width. And then, it's got extra parameters for, you can see zero and 1. So, I'm going to start at angle zero, and go all the way over to 1.
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And it's going to draw for me, this little, basically half a pie and then, it's going to fill it with the color white, because I've specified G Dot Set Color, as white. So, that's the the, that's pretty simple as the first command. Then, what we're going to do is, draw another arc in black. And this is just kind of aesthetics, we draw an arch and then, a line and you'll notice that it's exactly the same size as the white arc.
And the line is going to be right along the bottom, and that just kind of outlines your speedometer dial. You can have that or don't have that, I kind of like the look of it. This Draw. Line here in red, is the speedometer indicator, where it's pointing. And there's a couple of different commands in there, almost exactly the same, but you'll notice the coordinates change by one pixel, usually along the X- axis.
So, the starting X and the ending X, all increment by one pixel. And the reason for that is, there's no really easy way to change the thickness of a line. So, I'm drawing several lines right next to each other, one pixel apart, basically, manually changing the thickness of that line. So, you can leave it as one Draw Command or you can have several, depending on, on your taste and aesthetic preferences. This is the hard part down here, though, there really isn't any easy way to draw numbers around an arc. You kind of have to lay around with different values, and see how it looks and move them back and forth.
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But the command is, G dot Draw. String (g. draw. String). And so, you're going to give it the text you want to draw and then, the X and Y coordinates of where you want to put it.
And I just kind of experimented, these are the values that I got based on the position of my arc. Or, my speedometer dial, inside the panel I'm drawing in, how big it is, all of that stuff. And I just began experimenting with different values, and this is kind of what I found, worked fairly well. So, if we run this, we can kind of see what our speedometer is going to look like. And it doesn't look like anything yet, because as you remember, we have the click event to kick off the drawing.
So, I'm going to click right in the middle and there's our speedometer. And it's outlined with the black lines and it's got the numbers drawn on it. As a quick side note, if you put the outline commands before the fill command, you won't see them. Because that arc is the same size and it's going to cover up the outline. So, it's important to have your fills before your outlines. So, this is our extra thick indicator, pointing towards probably, about 1. And all the numbers arranged basically around in an arc, colored blue.
I've done some experimenting and you can replace the line with another arc, and program it's angle to respond to user input. So, that would be a way to program this kind of a speedometer or a game, where the car's accelerating and you want the speedometer to reflect that. But right here, because its static, I'm just using a simple line.
So, I hope you've enjoyed this video on how to create a speedometer using Java, I'm Josiah Rea.
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