# Graphics Class(2019)

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Basic Graphics functions 1)   Line drawLine ( int  x0, int  y0, int  x1, int  y1)   Draw a straight line from pixel (x0, y0) to pixel (x1, y1), Example:  g2.drawLine(200, 200, 700, 500); 2)   Circle drawOval ( int  x, int  y, int  w, int  h) Draw an oval with left-top corner at (x,y) and right-bottom corner at (x+w,y+h). Example: g2.drawOval(250, 250, 50, 50); fillOval ( int  x, int  y, int  width, int  height) Fill an oval with left-top corner at (x,y) and right-bottom corner at (x+w-1,y+h-1). This means that fillOval(x,y,1,1) draws one pixel. Example: g2.fillOval(350, 350, 50, 50); 3)   Rectangle drawRect ( int  x, int  y, int  w, int  h) Draw the border of a rectangle with left-top corner at (x,y) and right-bottom corner at (x+w,y+h). drawRoundRect(int x,int y,int width,int height,int arcWidth,int arcHeight) Example:   g2.drawRect(10, 10, 80, 80); g2.drawRoundRect(300, 300, 100, 100, 50, 50); fillRect ( int  x, int  y, int  w, int  h) Fill the rectangle with left-top corner at (x,y) and bottom-right corner at (x+w-1,y+h-1). fillRoundRect(int x,int y,int width,int height,int arcWidth,int arcHeight) Example: g2.fillRect(250, 150, 80, 80); g2.fillRoundRect(350, 350, 100, 100, 50, 50); 4)   Arc/Curve drawArc ( int  x, int  y, int  w, int  h, int  srtang, int  ang) Draw the arc with left-top corner (x,y) and right-bottom corner at (x+w,y+h). The arc starts at srtang and sweeps through ang degrees (positive is counterclockwise). fillArc ( int  x, int  y, int  width, int  height, int  srtang, int ang) Fill the arc of an oval with left-top corner (x,y) and right-bottom corner at (x+w-1,y+h-1). The arc starts at srtang and sweeps through ang degrees (positive is counterclockwise). Example: g2.drawArc(200, 200, 100, 100, 150, 100); g2.fillArc(500, 200, 100, 100, 150, 100); 5)   String drawString (String str, int  x, int  y): Draw the first argument str horizontally starting with the baseline of the string at point (x,y). setFont ( new  Font(String name, int  style, int  size)): Set the font. Some choices for the name are Serif, SansSerif, and Monospaced.  The style can Font.BOLD, Font.ITALIC, Font.PLAIN. The size is the point size; 12 is a commonly used size. Example:   g2.drawString( hello world , 100, 100); g2.setFont(new Font( ALGERIAN ,Font.ITALIC,20)); g2.drawString( font changed , 200, 200); 6)   Color setColor(Color col): Set the pen colour for future drawing operations (drawing lines and filling regions). Example: g2.setColor(new Color(200,100,100)); Graphics2D Functions 1)   Lines Line2D.Double ( double  x0, double  y0, double  x1, double  y1):   Create a line from (x0,y0) to (x1,y1). Example: Line2D line1 = new Line2D.Double(0,0,100,100); Line2D line2 = new Line2D.Float(0.0F,50.0F,200.0F,150.0F); 2)   Circle Ellipse2D.Double ( double  x, double  y, double  w, double  h): Create an ellipse inside the rectangle with corner (x,y), width w, height h. Example: Ellipse2D elli = new Ellipse2D.Double(200,200,100,50); Ellipse2D elli1 = new Ellipse2D.Double(250,250,100,50); g2.draw(elli); g2.draw(elli1); g2.fill(elli1); 3)   Rectangle Rectangle2D.Double ( double  x, double  y, double  w, double  h): Create a rectangle with corner (x,y), width w, height h RoundRectangle2D.Double ( double  x, double  y, double  w, double  h,double r1,double r2): Create a rectangle with corner (x,y), width w, height h, horizontal and vertical radius of ellipse  part that cuts the corner Example: Rectangle2D rect = new Rectangle2D.Double(0,0,100,100); RoundRectangle2D roundrect = new RoundRectangle2D.Double(100,100,100,100,50,50); Rectangle2D rect 1= new Rectangle2D.Double(250,250,100,100); RoundRectangle2D roundrect1 = new RoundRectangle2D.Double(350,350,100,100,50,50); g2.draw(rect); g2.draw(roundrect);   g2.draw(rect1); g2.draw(roundrect); g2.fill(rect1); g2.fill(roundrect2); 4)   Arc/Curve Functions Arc2D.Double (double X, double Y, double Width, double Height, double Theta, double Delta, int Type) Create a arc with corner (x,y), width w, height h, The arc starts at theta and sweeps through delta, type says closer types of the curve Arc.OPEN, Arc,PIE, Arc.CHOD. Example: Arc2D ar1 = new Arc2D.Double(300,100,100,100,90,90,Arc2D.CHORD); Arc2D ar2 = new Arc2D.Double(500,300,100,100,90,90,Arc2D.OPEN); Arc2D ar3 = new Arc2D.Double(500,500,100,100,90,90,Arc2D.PIE); Arc2D ar4 = new Arc2D.Double(100,500,100,100,90,90,Arc2D.PIE); g2.draw(ar1); g2.draw(ar2); g2.draw(ar3); g2.fill(ar4); g2.draw(ar4); Path A path is a sequence of drawing instructions. It is considered a Shape in Graphics2D, just as Line2D is a Shape. You construct a GeneralPath and then use its drawing methods to add pieces to the path. GeneralPath path=new GeneralPath(); The drawing methods are (notice that they all use float  arguments, not double ): moveTo ( float  x, float  y): Move the current point to (x,y). lineTo ( float  x, float  y): Append a line from the current point to (x,y) to the current path. quadTo ( float  x1, float  y1, float  x2, float  y2): Append a quadratic Bézier with control points the current point, (x1,y1), and (x2,y2) to the current path. curveTo ( float  x1, float  y1, float  x2, float  y2, float  x3, float  y3): Append a cubic Bézier with control points the current point, (x1,y1), (x2,y2), and (x3,y3) to the current path. closePath (): Close the path with a straight line back to the last moveTo point.  Example: GeneralPath  pa= new  GeneralPath(); //Triangle using path  pa.moveTo(100, 100); g2.setColor( new  Color(255,0,0));  pa.lineTo(200, 300);  pa.lineTo(400, 300);  pa.closePath(); g2.draw( pa); GeneralPath ca= new  GeneralPath(); //Bezier Curves using four control points ca.moveTo(100, 100); g2.setColor( new  Color(255,0,0)); ca.curveTo(150,150, 250,100,300,150); ca.curveTo(370,200, 425,150,500,200); ca.curveTo(470,250, 550,350,475,420); ca.curveTo(400,350, 350,420,275,350); g2.draw(ca); //Bezier curve using three control points ca.moveTo(200, 100); g2.setColor( new  Color(0,255,0)); ca.quadTo(250, 50, 300, 100); ca.quadTo(350, 150, 400, 100); ca.quadTo(450, 50, 500, 100); ca.quadTo(550, 150, 600, 100); g2.draw(ca); Line patterns public BasicStroke(float penWidth) public BasicStroke(float penWidth, int capStyle, int joinStyle, float miterLimit, float[] dashPattern, float dashOffset) //Cap style - CAP_SQUARE, CAP_BUTT and CAP_ROUND. // join style - JOIN_MITER, JOIN_BEVEL and JOIN_ROUND. //Mitterlimit, dashoffest  –   where to  begin pattern Example: g2.setStroke(new BasicStroke(5.0F)); Line2D line1 = new Line2D.Double(0,0,100,100); g2.draw(line1); float[] pattern =new float[] { 1, 3, 5, 3 }; g2.setStroke(new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND, 0, pattern, 0)); Line2D line2 = new Line2D.Float(0.0F,50.0F,200.0F,150.0F); g2.draw(line2);

Sep 22, 2019

#### Poli

Sep 22, 2019
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