Draw the triangle java

This code will create an output that looks like this:

Java Swing Tutorial: Make Shapes, GUI Help: Drawing Graphics

Now, let’s take a look at how to draw a triangle in Java Swing. Java Swing is a library which provides graphical user interface (GUI) components for Java programmers. With Java Swing, we can create a wide variety of shapes, including triangles.

The following code demonstrates how to draw a triangle in Java Swing:

import java.awt.Color; import java.awt.Graphics; import javax.swing.JPanel; class Triangle extends JPanel @Override public void paintComponent(Graphics g) super.paintComponent(g); int[] xPoints = 100, 200, 150; int[] yPoints = 200, 200, 100; int nPoints = 3; g.setColor(Color.red); g.fillPolygon(xPoints, yPoints, nPoints); public class DrawTriangle extends javax.swing.JFrame Triangle triangle = new Triangle(); public DrawTriangle() initComponents(); private void initComponents() setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); add(triangle); pack(); 

The code above creates a red-colored triangle with the following points: (100, 200), (200, 200), and (150, 100).

When you run the above code, you’ll be able to see the output which looks like this:

See how easy it is to draw a triangle with Java Swing?

Java Graphics – Draw Triangle Using drawPolygon

Another way to draw a triangle in Java is by using the drawPolygon method. This method is a part of the Graphics class in Java, and it draws a polygon defined by arrays of x and y coordinates. Here’s how:

import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; class TrianglePanel extends JPanel @Override public void paintComponent(Graphics g) super.paintComponent(g); int[] x = 50, 150, 100; int[] y = 150, 150, 50; g.setColor(Color.red); g.fillPolygon(x, y, 3); public class DrawTriangleGui extends JFrame private final JPanel trianglePanel; public DrawTriangleGui() setTitle("Drawing Triangle using drawPolygon"); trianglePanel = new TrianglePanel(); getContentPane().add(trianglePanel); setSize(200, 200); setLocationRelativeTo(null); setVisible(true); setDefaultCloseOperation(EXIT_ON_CLOSE); public static void main(String[] args) new DrawTriangleGui(); 

The code above creates a red-colored triangle with the following points: (50, 150), (150, 150), and (100, 50).

The output of the code above will look like this:

Conclusion

And there you have it, four different ways to draw a triangle in Java. From printing Floyd’s triangle to creating one using Java Swing and Graphics, we hope this article has helped you become a better programmer.

Remember, practice makes perfect, so try experimenting with different shapes and styles until you find something that works for you. Good luck and happy coding!

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How to Draw a Triangle in Java

Java language provides primitive and non-primitive data types such as “int”, “char”, “Strings”, and much more. It comprises loops, arrays, and lists that are used to perform different types of operations. Java programming language also offers additional functionalities such as drawing different shapes like triangles, patterns, and calculating areas.

This blog will explain the method of drawing triangles in Java. Let’s get started!

How to Draw a Triangle in Java?

A loop is a set of instructions repeatedly executed until a given condition is evaluated as “true”. It is also to draw different types of triangles.

Here, we will use the two loop statements for drawing a triangle in Java:

We will now check out each of the mentioned methods one by one!

Example 1: Draw a Right-angle Triangle in Java Using for Loop

This section will demonstrate the procedure of drawing a triangle using the “for” loop.

To do so, first, we will create integer type variables “size”, “i”, and “j”, where “size” indicates the number of rows of the triangle that will be printed, and “i” and “j” are the iterator variables:

We will use nested “for” loop for drawing a triangle. The first for loop or outer loop will control the rows iteration using the “i” variable, whereas the inner loop is handled using the “j” variable and it will print the triangle using “&” sign:

Execution of the above-given output will display a right-angle triangle:

Example 2: Draw an Isosceles Triangle in Java Using for Loop

In this example, we will draw an isosceles triangle using the “for” loop. Here, we will use three iterator variables, “i”, “j”, and “k”, where “i” is used for rows, “j” is for columns and “k” is used for the printing “@” sign by adding some spaces in rows:

int size = 5 ;
for ( int i = 1 ; i for ( int j = 1 ; j System. out . print ( " " ) ;
}
for ( int k = 1 ; k System. out . print ( "@" ) ;
}
System. out . print ( " \n " ) ;
}

Now, let’s check an example related to drawing a triangle using the while loop.

Example: Draw a Triangle in Java Using while Loop

In this example, we will draw a triangle with the help of the “while” loop. Similar to the above-given example, we have added a nested while loop, with iterator “i” for rows and “j” for columns. The “@” sign is added to give a shape to the triangle. The specified while loop will execute until its condition is evaluated as “true”:

int i , j ;
int size = 5 ;
i = 1 ;
while ( i j = 1 ;
while ( j System. out . print ( "@" ) ;
j ++;
}
i ++;
System. out . println ( ) ;
}

We have compiled all of the essential information related to drawing a simple triangle in Java.

Conclusion

To draw a triangle in Java, you can utilize a “while” or “for” loop. Java supports the loop statements that help to draw different shapes like triangles, patterns, and others. You can draw any type of shape by using the loop statements. In this blog, we explained the procedure of drawing right-angle and isosceles triangles using for and while loops.

About the author

Farah Batool

I completed my master's degree in computer science. I am an academic researcher and love to learn and write about new technologies. I am passionate about writing and sharing my experience with the world.

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How to Draw Shapes in Java?

Two-dimensional (2D) text, shapes, and pictures may be rendered in Java programs using the Graphics2D class. The java.awt package contains this class. Additionally, objects that represent geometric forms are defined using the Shape interface. The java.awt.geom package contains these geometries.

In this article, we’ll discuss how to draw geometric 2D visuals using the Graphics2D class and the Shape interface in Java. So without further ado, let’s dive deep into the topic and see some real examples. 👇

Table of Contents

How to Draw Shapes in Java?

As we’ve discussed in Java, there is a package named java.awt.geom that contains geometrical shapes. And using this package, we can draw shapes in Java.

The four different classes required to draw geometric 2D visuals are:

• java.awt.Graphics: This is an abstract class that we have used to draw or paint items.
• javax.swing.JFrame: This class inherits the java.awt Frame class to present the items in a GUI.
• javax.swing.JPanel: Provides better organization of components in GUIs.
• java.awt.Color: Used for adding different colors to components. These classes are used in all of the following functions.

How to Draw a Rectangle in Java?

Let’s see an example of a rectangle.

import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class Rectangle extends JPanel < public static void main(String[] a) < JFrame f = new JFrame(); f.setSize(400, 400); f.add(new Rectangle()); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); >public void paint(Graphics g) < g.setColor(Color.blue); g.fillRect(45, 75, 170,120); >>

To draw a geometric shape(rectangle) , the Rectangle class extends JPanel and we created a new JFrame for our 2D Graphic shape and selected a 400×400 size of GUI, and added a new Rectangle() to JFrame to create a rectangle.

In 2nd Method paint (Graphics g), to draw a rectangle, we wrote a builtin method g.fillRect(int x, int y, int w, int h), where x and y coordinate, w is the width, and h is the height of the rectangle. To add color to it, we’ll use the g.setColor(Color.c) method in which we asked for the blue color to be filled in the rectangle.

How to Draw a Circle in Java?

import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class Circle extends JFrame < public static void main(String[] a) < JFrame f = new JFrame(); f.setSize(400, 400); f.add(new Circle()); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); >public void paint(Graphics g) < g.setColor(Color.red); g.fillArc(45,75,150,150,0,360); >>

To draw a geometric shape(circle), the Circle class extends JPanel and we created a new JFrame for our 2D Graphic shape and selected a 400×400 size of GUI, and added a new circle() to JFrame to create a circle. Like this, a GUI is made by presenting a 2D geometric shape that is a circle

In 2nd Method paint(Graphics g) , to draw a circle we wrote a builtin method fillArc(int x, int y, int width, int height, int startangle, int arcangle) this method actually makes an arc but by changing the degrees and making changes according to, to let one end of a curve meet other and make it a circle we put arcAngle 360 degrees and the width value should be equal to height. The start angle can be any angle, you can use a start angle of 0 . and for adding color to it we wrote the method setColor(Color. c) in which we asked for the red color to be filled in the circle.

How to Draw a Triangle in Java?

import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class Triangle extends JFrame < public static void main(String[] a) < JFrame f = new JFrame(); f.setSize(400, 400); f.add(new Triangle()); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); >public void paint(Graphics g) < int p[]=; int q[]=; g.setColor(Color.pink); g.fillPolygon(p,q,3); > >

To draw a geometric shape(Triangle), the Triangle class extends JPanel and we created a new JFrame for our 2D Graphic shape and selected a 400×400 size of GUI, and added a new Triangle() to JFrame to create a triangle.

In 2nd Method Paint (Graphics g) , to draw a triangle, we wrote a builtin method fillPolygon([]p, []q, 3), where p and q are arrays consisting of a set of (x, y) coordinate pairs, where each pair is the vertex of the polygon. So for the triangle, we made 3 vertices, and to fill it with color, we wrote the method setColor (Color. c), in which we asked for the pink color to be filled in a triangle.

How to Draw Multiple Shapes in Java?

import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class AllBasicShapes extends JPanel < public static void main(String[] a) < JFrame f = new JFrame(); f.setSize(400, 400); f.add(new AllBasicShapes()); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); >public void paint(Graphics g) < g.drawRect(10, 10, 50, 50); //Draws square g.drawRect(10, 75, 100, 50); //Draws rectangle g.drawPolygon(new int[] , new int[] , 3); //Draws triangle g.drawArc(115,135,100,100,0,360); //Draws Circle g.dispose(); > >

To draw a geometric shape(allShapes), Allshapes class extends JPanel and we created a new JFrame for our 2D Graphic shape and selected a 400×400 size of GUI, and added a new AllShapes() to JFrame to create rectangle, square, triangle, and circle together in one go.

I n 2nd Method paint(Graphics g) , to draw all 4 basic shapes we wrote 4 methods for square drawRect(int x, int y, int width, int height) , for rectangle drawRect(int x, int y, int width, int height) is used, for triangle drawPolygon([]p,[]q,3) is used where 3 is the vertex, for circle drawArc(int x, int y, int width, int height, int start angle, int arc angle) is used where arc angel is 360 degree. Hence we have a square, rectangle, triangle, and circle with no colors in them.

Conclusion

To conclude the article on drawing shapes in Java, we’ve discussed the different required classes and packages to draw shapes in Java. In addition to that, we’ve discussed how to draw a circle, rectangle, triangle, and multiple shapes in Java, along with code examples.

Let’s have a quick recap of the topics discussed in this article.

1. How to draw shapes in Java?
2. How to draw a rectangle in java?
3. How to draw a circle in java?
4. How to draw a triangle in Java?
5. How to draw multiple shapes in Java?

Here is a quick task for you to explore more; Which is to draw a polygon in Java.

If you’ve found this article helpful, don’t forget to share and comment below, 👇 which solutions have helped you solve the problem?

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