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Registration is fast, simple and absolutely free so please, join our community today! If you have any problems with the registration process or your account login, please contact us. Remember Me? Forum Qt Qt Programming draw a polyline. Results 1 to 2 of 2. Thread: draw a polyline.

Thread Tools Show Printable Version. I can not use drawline, because I dont have access to QPainter. Anyideas how to do that?

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Cheers, Ben. Re: draw a polyline Can you show the actual code? QCanvasLine is part of Qt3 and it seems you're using Qt QT3 By windflower in forum Qt Programming.

Replies: 2 Last Post: 21st May Using QGLWidget paint engine to draw regular widgtes? Replies: 11 Last Post: 9th October Howto draw stuff By Morea in forum Newbie. Replies: 16 Last Post: 7th April Replies: 12 Last Post: 24th January Drawing over content widgets? Replies: 2 Last Post: 17th January Bookmarks Bookmarks Digg del.The QPolygonF class provides a vector of points using floating point precision. Note: All functions in this class are reentrant.

qt polyline

The easiest way to add points to a QPolygonF is to use its streaming operator, as illustrated below:. In addition to the functions provided by QVectorQPolygonF provides the boundingRect and translate functions for geometry operations.

qt polyline

QPolygonF also provides the isClosed function to determine whether a polygon's start and end points are the same, and the toPolygon function returning an integer precision copy of this polygon. The QPolygonF class is implicitly shared. The polygon contains the four vertices of the rectangle in clockwise order starting and ending with the top-left vertex. Returns the bounding rectangle of the polygon, or QRectF 0,0,0,0 if the polygon is empty. Returns true if the given point is inside the polygon according to the specified fillRule ; otherwise returns false.

Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed. See also QVector::first and QVector::last. See also intersected and subtracted. Writes the given polygon to the given streamand returns a reference to the stream. Reads a polygon from the given stream into the given polygonand returns a reference to the stream. Documentation contributions included herein are the copyrights of their respective owners.

Qt and respective logos are trademarks of The Qt Company Ltd. All other trademarks are property of their respective owners. See also QVector::isEmpty. See also isClosed. See also toPolygon. This function was introduced in Qt 4.

A polygon is said to be closed if its start point and end point are equal.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I need a polyline with an arrow at the end.

My Idea was that i copy the last line part, reduce his size and give him an specific angle. I don't think it is possible, I can only suggest you to look at the Analog Clock example on the documentation to see how to draw a rotated arrow.

Learn more. Drawing polylines with specific angles in QT Ask Question. Asked 4 years, 11 months ago. Active 4 years, 11 months ago. Viewed times.

Qt Location / Qml Maps: reduce polyline points depending on location and visible area

Active Oldest Votes. Gianluca Gianluca 2, 2 2 gold badges 31 31 silver badges 27 27 bronze badges. Sign up or log in Sign up using Google.

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qt polyline

Triage needs to be fixed urgently, and users need to be notified upon…. Technical site integration observational experiment live on Stack Overflow. Dark Mode Beta - help us root out low-contrast and un-converted bits. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled.The Basic Drawing example shows how to display basic graphics primitives in a variety of styles using the QPainter class.

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QPainter performs low-level painting on widgets and other paint devices. The class can draw everything from simple lines to complex shapes like pies and chords. It can also draw aligned text and pixmaps. Normally, it draws in a "natural" coordinate system, but it can in addition do view and world transformation.

C++ Qt 74 - QPainter and QPen

The example provides a render area, displaying the currently active shape, and lets the user manipulate the rendered shape and its appearance using the QPainter parameters: The user can change the active shape Shapeand modify the QPainter 's pen Pen WidthPen StylePen CapPen Joinbrush Brush Style and render hints Antialiasing. In addition the user can rotate a shape Transformations ; behind the scenes we use QPainter 's ability to manipulate the coordinate system to perform the rotation.

First we will review the Window class, then we will take a look at the RenderArea class. The Window class inherits QWidgetand is the application's main window displaying a RenderArea widget in addition to several parameter widgets. We declare the various widgets, and three private slots updating the RenderArea widget: The shapeChanged slot updates the RenderArea widget when the user changes the currently active shape.

We call the penChanged slot when either of the QPainter 's pen parameters changes. And the brushChanged slot updates the RenderArea widget when the user changes the painter's brush style. In the constructor we create and initialize the various widgets appearing in the main application window. First we create the RenderArea widget that will render the currently active shape.

Then we create the Shape combobox, and add the associated items i. QPainter 's pen is a QPen object; the QPen class defines how a painter should draw lines and outlines of shapes. A pen has several properties: Width, style, cap and join. A pen's width can be zero or greater, but the most common width is zero. Note that this doesn't mean 0 pixels, but implies that the shape is drawn as smoothly as possible although perhaps not mathematically correct.

The pen style defines the line type. The default style is solid Qt::SolidLine. Setting the style to none Qt::NoPen tells the painter to not draw lines or outlines.

The pen cap defines how the end points of lines are drawn. And the pen join defines how two lines join when multiple connected lines are drawn. The cap and join only apply to lines with a width of 1 pixel or greater. The QBrush class defines the fill pattern of shapes drawn by a QPainter. The default brush style is Qt::NoBrush. This style tells the painter to not fill shapes.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. How can polyline and spline be mouse tracked in graphics view using QPainter class in Qt? I have pasted my code. Please check and edit. I am generating a polyline on the click of a button. Learn more. Tracking polyline in graphics view in Qt Ask Question. Asked 5 years, 9 months ago.

Active 5 years, 9 months ago. Viewed times. Active Oldest Votes. Hope that helps a little bit. Matthias Matthias 1 1 gold badge 6 6 silver badges 11 11 bronze badges. Please have a look and reply me. You move over the Graphicsview not over the polyline. I write it in the answer. You have to implement it by yourself. This should be a help to point you in the right direction. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

Email Required, but never shown. The Overflow Blog. The Overflow How many jobs can be done at home? Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow. Triage needs to be fixed urgently, and users need to be notified upon…. Dark Mode Beta - help us root out low-contrast and un-converted bits.The MapPolyline type displays a polyline on a map.

The MapPolyline type displays a polyline on a map, specified in terms of an ordered list of coordinates. The coordinates on the path cannot be directly changed after being added to the Polyline. Instead, copy the path into a var, modify the copy and reassign the copy back to the path. Coordinates can also be added and removed at any time using the addCoordinate and removeCoordinate methods.

By default, the polyline is displayed as a 1-pixel thick black line. This can be changed using the line. MapPolylines have a rendering cost that is O n with respect to the number of vertices. This means that the per frame cost of having a polyline on the Map grows in direct proportion to the number of points in the polyline.

Like the other map objects, MapPolyline is normally drawn without a smooth appearance. Setting the opacity property will force the object to be blended, which decreases performance considerably depending on the hardware in use. There have been occasional reports of issues and rendering inconsistencies on some particularly quite old platforms. No workaround is yet available for these issues. The following snippet shows a MapPolyline with 4 points, making a shape like the top part of a "question mark"?

The line drawn is 3 pixels in width and green in color. This property is part of the line property group.

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The line property group holds the width and color used to draw the line. The width is in pixels and is independent of the zoom level of the map. The default values correspond to a black border with a width of 1 pixel.

See also insertCoordinateremoveCoordinateand path. Gets the coordinate of the polyline at the given index. If the index is outside the path's bounds then an invalid coordinate is returned. See also addCoordinateremoveCoordinateand path. See also addCoordinateinsertCoordinateand path. Removes coordinate from the path. If there are multiple instances of the same coordinate, the one added last is removed. Replaces the coordinate in the current path at the given index with the new coordinate.

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See also addCoordinateinsertCoordinateremoveCoordinateand path.The MapPolyline type displays a polyline on a map, specified in terms of an ordered list of coordinates. The coordinates on the path cannot be directly changed after being added to the Polyline. Instead, copy the path into a var, modify the copy and reassign the copy back to the path. Coordinates can also be added and removed at any time using the addCoordinate and removeCoordinate methods.

Draw polylines : Draw Shape « Qt « C++

By default, the polyline is displayed as a 1-pixel thick black line. This can be changed using the line. MapPolylines have a rendering cost that is O n with respect to the number of vertices. This means that the per frame cost of having a polyline on the Map grows in direct proportion to the number of points in the polyline.

Like the other map objects, MapPolyline is normally drawn without a smooth appearance. Setting the opacity property will force the object to be blended, which decreases performance considerably depending on the hardware in use.

The following snippet shows a MapPolyline with 4 points, making a shape like the top part of a "question mark"? The line drawn is 3 pixels in width and green in color.

This property holds whether the item automatically fades in when zooming into the map starting from very low zoom levels.

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By default this is true. Setting this property to false causes the map item to always have the opacity specified with the QtQuick::Item::opacity property, which is 1. This property is part of the line property group. The line property group holds the width and color used to draw the line.

The width is in pixels and is independent of the zoom level of the map. The default values correspond to a black border with a width of 1 pixel. See also insertCoordinateremoveCoordinateand path.

qt polyline

Gets the coordinate of the polyline at the given index. If the index is outside the path's bounds then an invalid coordinate is returned. See also addCoordinateremoveCoordinateand path.

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See also addCoordinateinsertCoordinateand path. Removes coordinate from the path.