https://github.com/nathsou/canvas2d

Simple pixel manipulation library in Java
https://github.com/nathsou/canvas2d

Last synced: about 2 months ago
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Simple pixel manipulation library in Java

• Host: GitHub
• URL: https://github.com/nathsou/canvas2d
• Owner: nathsou
• Created: 2015-06-21T17:53:18.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2015-07-05T06:41:36.000Z (over 9 years ago)
• Last Synced: 2024-10-11T20:42:56.286Z (3 months ago)
• Language: Java
• Size: 262 KB
• Stars: 3
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Canvas2D

Canvas2D allows you to easily manipulate pixel arrays

```java

//Creating the canvas

Canvas2D canvas = new Canvas2D(800, 600, Color.white);

canvas.setStrokeColor(Color.black);

```

## Simple shapes

#### Points and Lines

```java

//Drawing a point

canvas.setRGB(10, 10, Color.red);

//Drawing lines

canvas.drawLine(new Point(40, 35), new Point(40, 125));

canvas.drawLine(new Point(160, 35), new Point(160, 125));

canvas.drawLine(new Point(30, 175), new Point(30, 150));

canvas.drawLine(new Point(30, 150), new Point(170, 175));

canvas.drawLine(new Point(30, 175), new Point(170, 175));

```

![Lines](http://nathsou.fr/iup/u/f0bc-canvas.png)

#### Polygons

```java

Polygon triangle = new Polygon(new Point(175, 175), 3, 150);

canvas.draw(triangle);

        

Polygon heptagon = new Polygon(new Point(500, 175), 7, 150);

canvas.setStrokeColor(Color.red);

canvas.draw(heptagon);

        

canvas.fillRegion(new Point(0, 350), new Point(700, 700), Color.black);

Polygon square = new Rectangle(new Point(175, 525), 150, 150);

canvas.setStrokeColor(Color.white);

canvas.draw(square);

        

//A circle is considered as a Polygon

Polygon circle = new Circle(new Point(500, 525), 150);

canvas.setStrokeColor(Color.green);

canvas.draw(circle);

```

![Polygons](http://nathsou.fr/iup/u/78e9-canvas.png)

You can also draw non regular polygons:

```java

Polygon weirdPolygon = new Polygon(new Point[]{

         new Point(100, 200),

         new Point(150, 80),

         new Point(227, 169),

         new Point(10, 260),

         new Point(10, 10),

 });

        canvas.draw(strangePolygon);

```

![Polygons](http://nathsou.fr/iup/u/7303-canvas.png)

####Manipulating images

To demonstrate how Canvas2D handles image manipulation, we will create a canvas using the following image :

![Painting from Eugène Galien-Laloue](http://images.fineartamerica.com/images-medium-large-5/larc-de-triomphe-paris-eugene-galien-laloue.jpg)

The CanvasFilters abstract class offers some image filters such as:

####Gray scaling

```java

//To manipulate images, Canvas2D uses its own Pixmap class

Canvas2D canvas = new Canvas2D(new Pixmap("Pictures/larc-de-triomphe-paris-eugene-galien-laloue.jpg")));

canvas = CanvasFilters.grayScale(canvas);

```

![GrayScaling](http://nathsou.fr/iup/u/f576-canvas.png)

####Negative/Inverse

```java

canvas = CanvasFilters.negative(canvas);

```

![Negative](http://nathsou.fr/iup/u/91a4-canvas.png)

#####Threshold

```java

canvas = CanvasFilters.naiveTreshold(canvas, 10);

```

![Threshold](http://nathsou.fr/iup/u/bdc3-canvas.png)

####Canny Edge Detection

```java

canvas = CanvasFilters.cannyEdge(canvas);

```

![CannyEdgeDetection](http://nathsou.fr/iup/u/9125-canvas.png)

####Pixelization

```java

canvas = CanvasFilters.pixelate(canvas, 5);

```

![Pixelisation](http://nathsou.fr/iup/u/6488-canvas.png)

####Color filtering

```java

canvas = CanvasFilters.filterColor(canvas, new Color(154, 139, 130), 25);

```

![ColorFiltering](http://nathsou.fr/iup/u/6139-canvas.png)

##Combining filters

```java

canvas = CanvasFilters.pixelate(canvas, 2);

canvas = CanvasFilters.naiveTreshold(canvas, 10);

canvas = CanvasFilters.replaceColor(canvas, Color.white, Color.orange, 1);

```

![Combining](http://nathsou.fr/iup/u/fbaa-canvas.png)