Biker back Parker-several details of drawing a line on graphics using a pen

Biker and Parker

Refer:

"10 basic techniques for GDI + programming"

"Rubber band"

Draw dotted lines on the canvas with a pen

To draw the dotted line and the geometric shape of the dotted line border on the graphics object, the key is all on the pen object.

Pen. dashstyle -- used to set the dotted line style. This property receives a dashstyle enumeration.

Dash	Draw line
Dashdot	Click to draw a line
Dashdotdot	Point-to-Point
Dot	Point
Solid	Solid line
Custom	User-Defined line type

Protected override void onpaint (painteventargs E)

{

Base. onpaint (E );

Pen P = new pen (color. Red );

P. dashstyle = dashstyle. Dash;

E. Graphics. drawline (p, new point (10, 10), new point (300,300 ));

}

Pen. dashcap -- specifies the line-to-phase style of the end point of a dashcap. This property accepts a dash enumeration.

Flat	Both ends are square.
Round	Both ends are rounded circles.
Triangle	Both ends are triangular.

Protected override void onpaint (painteventargs E)

{

Base. onpaint (E );

// Set the smoothingmode property to smooth the line.

E. Graphics. smoothingmode =

System. Drawing. drawing2d. smoothingmode. antialias;

// Create a new pen object.

Pen greenpen = new pen (color. Green );

// Set the width to 6.

Greenpen. width = 6.0f;

// Set the dashcap to round.

Greenpen. dashcap = system. Drawing. drawing2d. dashcap. Round;

// Create a custom dash pattern.

Greenpen. dashpattern = new float [] {4.0f, 2.0f, 1.0f, 3.0f };

// Draw a line.

E. Graphics. drawline (greenpen, 20366f, 20366f, 100366f, 240.0f );

// Change the smoothingmode to none.

E. Graphics. smoothingmode =

System. Drawing. drawing2d. smoothingmode. None;

// Draw another line.

E. Graphics. drawline (greenpen, 100366f, 240.0f, 160.0f, 20366f );

// Dispose of the custom pen.

Greenpen. Dispose ();

}

Pen. dashoffset -- the distance from the starting point of a straight line to the starting point of a dash.

Pen. dashpattern -- an array of custom dashes and blank areas.

Draw arrows on a straight line

Pen. startcap -- the line-to-phase style at the starting point of a straight line.

Pen. endcap -- the line-to-phase style of the end point of a straight line.

Both attributes are subject to linecap enumeration.

Protected override void onpaint (painteventargs E)

{

Base. onpaint (E );

Pen P = new pen (color. Red );

P. width = 20;

P. startcap = linecap. roundanchor;

P. endcap = linecap. diamondanchor;

E. Graphics. drawline (p, 50, 50,250,250 );

}

Pen. customstartcap -- specifies the starting line and phase style of the custom line segment.

Pen. customendcap -- custom line section finish line style.

These two attributes accept the customlinecap object.

Protected override void onpaint (painteventargs E)

{

Base. onpaint (E );

Graphicspath hpath = new graphicspath ();

// Create the outline for our custom end cap.

Hpath. addline (new point (0, 0), new point (0, 5 ));

Hpath. addline (new point (0, 5), new point (5, 1 ));

Hpath. addline (new point (5, 1), new point (3, 1 ));

// Construct the hook-shaped end cap.

Customlinecap hookcap = new customlinecap (null, hpath );

// Set the start cap and end cap of the hookcap to be rounded.

Hookcap. setstrokecaps (linecap. Round, linecap. Round );

// Create a pen and set end custom start and end

// Caps to the hook cap.

Pen customcappen = new pen (color. Black, 5 );

Customcappen. customstartcap = hookcap;

Customcappen. customendcap = hookcap;

// Create a second pen using the start and end caps from

// The Hook cap.

Pen cappen = new pen (color. Red, 10 );

Linecap startcap;

Linecap endcap;

Hookcap. getstrokecaps (Out startcap, out endcap );

Cappen. startcap = startcap;

Cappen. endcap = endcap;

// Create a line to draw.

Point [] points = {New Point (100,100), new point (200, 50 ),

New Point (250,300 )};

// Draw the lines.

E. Graphics. drawlines (cappen, points );

E. Graphics. drawlines (mcmcappen, points );

}

Refer:

"10 basic techniques for GDI + programming"

"Rubber band"