Drawing Basic Shapes

• You  draw  shapes in the render method using the graphics object.  

• If you write a class that draws anything, it will need to be passed a reference to the Graphics object.

// Draws the outline of a rectangle or oval.  Uses x, y, w, h.

g.drawRect(50, 50, 50, 50);

g.drawOval(100, 200, 50, 50);

// Draws a line between two points

g.drawLine(400,  25,  500,  75);

// Draws a filled rectangle.  Uses x, y, w, h.

g.fillRect(200,  200,  500,  500);

// You can use variables to create animations for these images

g.fillOval(xPos, 100, 200, 200);

Changing Colors

• Slick uses RGB Color.   When you set a color, all drawings and text will be in that color.

  • Think of it as picking up a marker:  you're now writing in this color until you change it.
    
    

• If your code doesn't recognize Color, it will need to import it.

  • Be sure you import the correct file:  org.newdawn.slick.Color

// Sets color using a preset color.

g.setColor(Color.cyan);

// Sets color using a custom RGB value.  

g.setColor(new Color(125, 50, 70));

// You can add a fourth parameter as "alpha value" or transparency (0-255)

g.setColor(new Color(255, 0, 0, 50));

// You can store these colors as variables and use color methods...

Color mediumRed = new Color(235, 45, 50);

Color darkRed = mediumRed.darker();

int blueAmount = mediumRed.getBlue();