Draw Arc VI

LabVIEW 2018 Help


Edition Date: March 2018
Part Number: 371361R-01
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Owning Palette: Picture Functions VIs

Requires: Base Development System

Draws an arc in a picture.

Details  

arc size determines the degree value of the circle you want to draw. This value can range from -360 to 360. For example, a value of 360 creates a complete circle, and a value of 180 creates a semicircle.
start angle determines where the arc begins.
picture is the picture to which you want to add the arc. The default is an empty picture.
rect is a cluster that contains four numeric controls that describe the left, top, right, and bottom coordinates of the outer edges of the rectangle. Horizontal coordinates increase to the right, and vertical coordinates increase to the bottom.
left is the horizontal coordinate of the left edge of the rectangle.
top is the vertical coordinate of the top edge of the rectangle.
right is the horizontal coordinate of the right edge of the rectangle.
bottom is the vertical coordinate of the bottom edge of the rectangle.
fill? specifies whether to fill the rectangle. If FALSE (default), the VI draws only the arc component and does not draw interior bounds of the wedge.
color is the color of the lines. If the interior is filled, the VI uses this color for the interior. The default is black.

You can wire a color box constant to this input.
pen sets the width and style of the pen the VI uses to draw the picture.
Width sets the width in pixels of the pen the VI uses to draw the picture.
Style sets the style of the line the VI uses to draw the picture.

0Solid (default)
1Dash
2Dot
3DashDot
4DashDotDot
new picture is the picture that contains the new image. You can wire this output to any other picture input to add more drawing instructions to the picture. You also can wire this output to the Picture to Pixmap VI to obtain an image data cluster. You then can use the Graphics Formats VIs to save the image data to a file. You can wire this output to the Concatenate Strings function to concatenate the output from multiple Picture Functions VIs so that they draw on a single picture control.

Draw Arc Details

A rectangle specifies the size of an oval that contains the arc. Thus, the arc may not fill the whole rectangle. LabVIEW specifies the angles that describe the arc in degrees. It can range from –360° to 360°, with positive angles appearing clockwise, and negative angles appearing counterclockwise. Zero degrees is straight up.

LabVIEW measures all angles as though the enclosing rectangle were square. Thus, a line from the center to the upper-right corner describes an angle of 45°. The following illustration shows the conventions used in specifying the angle of a point of an arc.

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