free visual basic barcode generator Drawing Lines in Java

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Drawing Lines
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Lines are drawn by means of the drawLine( ) method, shown here: void drawLine(int startX, int startY, int endX, int endY) drawLine( ) displays a line in the current drawing color that begins at startX,startY and ends at endX,endY The following applet draws several lines:
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// Draw lines import javaawt*; import javaapplet*; /* <applet code="Lines" width=300 height=200> </applet> */ public class Lines extends Applet { public void paint(Graphics g) { gdrawLine(0, 0, 100, 100); gdrawLine(0, 100, 100, 0); gdrawLine(40, 25, 250, 180); gdrawLine(75, 90, 400, 400); gdrawLine(20, 150, 400, 40); gdrawLine(5, 290, 80, 19); } }
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Sample output from this program is shown here:
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Drawing Rectangles
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The drawRect( ) and fillRect( ) methods display an outlined and filled rectangle, respectively They are shown here: void drawRect(int top, int left, int width, int height) void fillRect(int top, int left, int width, int height) The upper-left corner of the rectangle is at top,left The dimensions of the rectangle are specified by width and height
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Part II:
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The Java Library
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To draw a rounded rectangle, use drawRoundRect( ) or fillRoundRect( ), both shown here: void drawRoundRect(int top, int left, int width, int height, int xDiam, int yDiam) void fillRoundRect(int top, int left, int width, int height, int xDiam, int yDiam) A rounded rectangle has rounded corners The upper-left corner of the rectangle is at top,left The dimensions of the rectangle are specified by width and height The diameter of the rounding arc along the X axis is specified by xDiam The diameter of the rounding arc along the Y axis is specified by yDiam The following applet draws several rectangles:
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// Draw rectangles import javaawt*; import javaapplet*; /* <applet code="Rectangles" width=300 height=200> </applet> */ public class Rectangles extends Applet { public void paint(Graphics g) { gdrawRect(10, 10, 60, 50); gfillRect(100, 10, 60, 50); gdrawRoundRect(190, 10, 60, 50, 15, 15); gfillRoundRect(70, 90, 140, 100, 30, 40); } }
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Sample output from this program is shown here:
Drawing Ellipses and Circles
To draw an ellipse, use drawOval( ) To fill an ellipse, use fillOval( ) These methods are shown here:
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void drawOval(int top, int left, int width, int height) void fillOval(int top, int left, int width, int height) The ellipse is drawn within a bounding rectangle whose upper-left corner is specified by top,left and whose width and height are specified by width and height To draw a circle, specify a square as the bounding rectangle The following program draws several ellipses:
// Draw Ellipses import javaawt*; import javaapplet*; /* <applet code="Ellipses" width=300 height=200> </applet> */ public class Ellipses extends Applet { public void paint(Graphics g) { gdrawOval(10, 10, 50, 50); gfillOval(100, 10, 75, 50); gdrawOval(190, 10, 90, 30); gfillOval(70, 90, 140, 100); } }
Sample output from this program is shown here:
Drawing Arcs
Arcs can be drawn with drawArc( ) and fillArc( ), shown here: void drawArc(int top, int left, int width, int height, int startAngle, int sweepAngle) void fillArc(int top, int left, int width, int height, int startAngle, int sweepAngle)
Part II:
The Java Library
The arc is bounded by the rectangle whose upper-left corner is specified by top,left and whose width and height are specified by width and height The arc is drawn from startAngle through the angular distance specified by sweepAngle Angles are specified in degrees Zero degrees is on the horizontal, at the three o clock position The arc is drawn counterclockwise if sweepAngle is positive, and clockwise if sweepAngle is negative Therefore, to draw an arc from twelve o clock to six o clock, the start angle would be 90 and the sweep angle 180 The following applet draws several arcs:
// Draw Arcs import javaawt*; import javaapplet*; /* <applet code="Arcs" width=300 height=200> </applet> */ public class Arcs extends Applet { public void paint(Graphics g) { gdrawArc(10, 40, 70, 70, 0, 75); gfillArc(100, 40, 70, 70, 0, 75); gdrawArc(10, 100, 70, 80, 0, 175); gfillArc(100, 100, 70, 90, 0, 270); gdrawArc(200, 80, 80, 80, 0, 180); } }
Sample output from this program is shown here:
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