Bulding Graphical MIDlets

Numeric Color Component Values

Lines

Dipakai untuk menggambar garis.
Syntax: 

drawLine(int x1, int y1, int x2, int y2)

dimana x1, y1 adalah starting point dan x2, y2 adalah ending point.

Contoh:

public void paint(Graphics g) {

g.drawLine(5, 10, 15, 55);

}

Rectangles

Dipakai untuk menggambar persegi atau persegi panjang.

Syntax: drawRect(int x, int y, int width, int height)

Contoh:

public void paint(Graphics g) {

g.drawRect(5, 10, 15, 55);

}

Arcs

Dipakai untuk menggambar sudut.

Syntax: drawArc(int x, int y, int width, int height, int startAngle, int arcAngle)

Contoh:

public void paint(Graphics g) {

g.drawArc(5, 10, 150, 75, 95, 115);

}

Drawing Text

Dipakai untuk menambahkan teks.

Syntax: setFont(Font font)

Font getFont(int face, int style, int size)

The font face must be one of the following values: FACE_SYSTEM, FACE_MONOSPACE, or FACE_PROPORTIONAL.

The style of font must be one of the constants I mentioned earlier: STYLE_PLAIN or a combination 

of STYLE_BOLD, STYLE_ITALIC, and STYLE_UNDERLINED. T

he font size is specified 

as one of the following predefined constants: SIZE_SMALL, SIZE_MEDIUM, or SIZE_LARGE.

Contoh:

Font myFont = Font.getFont(Font.MONOSPACE, Font.LARGE, Font.BOLD | Font.UNDERLINED);

drawString(String str, int x, int y, int anchor)

An anchor point is associated with a horizontal constant and a

vertical constant, each of which determines the horizontal and vertical positioning of the 

text with respect to the anchor point. The horizontal constants used to describe an anchor 

point are LEFT, HCENTER, and RIGHT. One of these constants is combined with a vertical 

constant to fully describe an anchor point. The vertical constants are TOP, BASELINE, and 

BOTTOM.

Contoh:

g.drawString(“Look up here!”, getWidth() / 2, 0, Graphics.HCENTER | Graphics.TOP);

Drawing Images

 Dipakai untuk menambahkan image atau picture.

Contoh:

public void paint(Graphics g) {

// Clear the display

g.setColor(255, 255, 255); // White

g.fillRect(0, 0, getWidth(), getHeight());

// Create and load the image

Image img = Image.createImage(“Bull.png”);

// Draw the image

g.drawImage(img, getWidth()/2, getHeight()/2,

Graphics.HCENTER|Graphics.VCENTER);

}

Sumber: Sams Teach Yourself: Wireless Java With J2ME in 21 Days