See below the example used to generate the figure:
@code
int main(int argc, char *argv[])
+ {
+
int value = 50;
int value2 = 0;
- cvNamedWindow("main1",CV_WINDOW_NORMAL);
- cvNamedWindow("main2",CV_WINDOW_AUTOSIZE | CV_GUI_NORMAL);
- cvCreateTrackbar( "track1", "main1", &value, 255, NULL);//OK tested
- char* nameb1 = "button1";
- char* nameb2 = "button2";
- cvCreateButton(nameb1,callbackButton,nameb1,CV_CHECKBOX,1);
+ namedWindow("main1",WINDOW_NORMAL);
+ namedWindow("main2",WINDOW_AUTOSIZE | CV_GUI_NORMAL);
+ createTrackbar( "track1", "main1", &value, 255, NULL);
+
+ String nameb1 = "button1";
+ String nameb2 = "button2";
- cvCreateButton(nameb2,callbackButton,nameb2,CV_CHECKBOX,0);
- cvCreateTrackbar( "track2", NULL, &value2, 255, NULL);
- cvCreateButton("button5",callbackButton1,NULL,CV_RADIOBOX,0);
- cvCreateButton("button6",callbackButton2,NULL,CV_RADIOBOX,1);
+ createButton(nameb1,callbackButton,&nameb1,QT_CHECKBOX,1);
+ createButton(nameb2,callbackButton,NULL,QT_CHECKBOX,0);
+ createTrackbar( "track2", NULL, &value2, 255, NULL);
+ createButton("button5",callbackButton1,NULL,QT_RADIOBOX,0);
+ createButton("button6",callbackButton2,NULL,QT_RADIOBOX,1);
- cvSetMouseCallback( "main2",on_mouse,NULL );
+ setMouseCallback( "main2",on_mouse,NULL );
- IplImage* img1 = cvLoadImage("files/flower.jpg");
- IplImage* img2 = cvCreateImage(cvGetSize(img1),8,3);
- CvCapture* video = cvCaptureFromFile("files/hockey.avi");
- IplImage* img3 = cvCreateImage(cvGetSize(cvQueryFrame(video)),8,3);
+ Mat img1 = imread("files/flower.jpg");
+ VideoCapture video;
+ video.open("files/hockey.avi");
- while(cvWaitKey(33) != 27)
+ Mat img2,img3;
+
+ while( waitKey(33) != 27 )
{
- cvAddS(img1,cvScalarAll(value),img2);
- cvAddS(cvQueryFrame(video),cvScalarAll(value2),img3);
- cvShowImage("main1",img2);
- cvShowImage("main2",img3);
+ img1.convertTo(img2,-1,1,value);
+ video >> img3;
+
+ imshow("main1",img2);
+ imshow("main2",img3);
}
- cvDestroyAllWindows();
- cvReleaseImage(&img1);
- cvReleaseImage(&img2);
- cvReleaseImage(&img3);
- cvReleaseCapture(&video);
+ destroyAllWindows();
+
return 0;
}
@endcode
cv::Mat image = cv::imread("Assets/sample.jpg");
cv::Mat converted = cv::Mat(image.rows, image.cols, CV_8UC4);
- cvtColor(image, converted, CV_BGR2BGRA);
+ cv::cvtColor(image, converted, COLOR_BGR2BGRA);
cv::imshow(windowName, converted); // this will create window if it hasn't been created before
int state = 42;
//! Flags for cv::namedWindow
enum WindowFlags {
- WINDOW_NORMAL = 0x00000000, //!< the user can resize the window (no constraint) / also use to switch a fullscreen window to a normal size
- WINDOW_AUTOSIZE = 0x00000001, //!< the user cannot resize the window, the size is constrainted by the image displayed
- WINDOW_OPENGL = 0x00001000, //!< window with opengl support
+ WINDOW_NORMAL = 0x00000000, //!< the user can resize the window (no constraint) / also use to switch a fullscreen window to a normal size.
+ WINDOW_AUTOSIZE = 0x00000001, //!< the user cannot resize the window, the size is constrainted by the image displayed.
+ WINDOW_OPENGL = 0x00001000, //!< window with opengl support.
- WINDOW_FULLSCREEN = 1, //!< change the window to fullscreen
- WINDOW_FREERATIO = 0x00000100, //!< the image expends as much as it can (no ratio constraint)
- WINDOW_KEEPRATIO = 0x00000000 //!< the ratio of the image is respected
+ WINDOW_FULLSCREEN = 1, //!< change the window to fullscreen.
+ WINDOW_FREERATIO = 0x00000100, //!< the image expends as much as it can (no ratio constraint).
+ WINDOW_KEEPRATIO = 0x00000000 //!< the ratio of the image is respected.
};
//! Flags for cv::setWindowProperty / cv::getWindowProperty
enum WindowPropertyFlags {
- WND_PROP_FULLSCREEN = 0, //!< fullscreen property (can be WINDOW_NORMAL or WINDOW_FULLSCREEN)
- WND_PROP_AUTOSIZE = 1, //!< autosize property (can be WINDOW_NORMAL or WINDOW_AUTOSIZE)
- WND_PROP_ASPECT_RATIO = 2, //!< window's aspect ration (can be set to WINDOW_FREERATIO or WINDOW_KEEPRATIO);
- WND_PROP_OPENGL = 3 //!< opengl support
+ WND_PROP_FULLSCREEN = 0, //!< fullscreen property (can be WINDOW_NORMAL or WINDOW_FULLSCREEN).
+ WND_PROP_AUTOSIZE = 1, //!< autosize property (can be WINDOW_NORMAL or WINDOW_AUTOSIZE).
+ WND_PROP_ASPECT_RATIO = 2, //!< window's aspect ration (can be set to WINDOW_FREERATIO or WINDOW_KEEPRATIO).
+ WND_PROP_OPENGL = 3 //!< opengl support.
};
-enum { EVENT_MOUSEMOVE = 0,
- EVENT_LBUTTONDOWN = 1,
- EVENT_RBUTTONDOWN = 2,
- EVENT_MBUTTONDOWN = 3,
- EVENT_LBUTTONUP = 4,
- EVENT_RBUTTONUP = 5,
- EVENT_MBUTTONUP = 6,
- EVENT_LBUTTONDBLCLK = 7,
- EVENT_RBUTTONDBLCLK = 8,
- EVENT_MBUTTONDBLCLK = 9,
- EVENT_MOUSEWHEEL = 10,
- EVENT_MOUSEHWHEEL = 11
+//! Mouse Events see cv::MouseCallback
+enum MouseEventTypes {
+ EVENT_MOUSEMOVE = 0, //!< indicates that the mouse pointer has moved over the window.
+ EVENT_LBUTTONDOWN = 1, //!< indicates that the left mouse button is pressed.
+ EVENT_RBUTTONDOWN = 2, //!< indicates that the right mouse button is pressed.
+ EVENT_MBUTTONDOWN = 3, //!< indicates that the middle mouse button is pressed.
+ EVENT_LBUTTONUP = 4, //!< indicates that left mouse button is released.
+ EVENT_RBUTTONUP = 5, //!< indicates that right mouse button is released.
+ EVENT_MBUTTONUP = 6, //!< indicates that middle mouse button is released.
+ EVENT_LBUTTONDBLCLK = 7, //!< indicates that left mouse button is double clicked.
+ EVENT_RBUTTONDBLCLK = 8, //!< indicates that right mouse button is double clicked.
+ EVENT_MBUTTONDBLCLK = 9, //!< indicates that middle mouse button is double clicked.
+ EVENT_MOUSEWHEEL = 10,//!< positive and negative values mean forward and backward scrolling, respectively.
+ EVENT_MOUSEHWHEEL = 11 //!< positive and negative values mean right and left scrolling, respectively.
};
-enum { EVENT_FLAG_LBUTTON = 1,
- EVENT_FLAG_RBUTTON = 2,
- EVENT_FLAG_MBUTTON = 4,
- EVENT_FLAG_CTRLKEY = 8,
- EVENT_FLAG_SHIFTKEY = 16,
- EVENT_FLAG_ALTKEY = 32
+//! Mouse Event Flags see cv::MouseCallback
+enum MouseEventFlags {
+ EVENT_FLAG_LBUTTON = 1, //!< indicates that the left mouse button is down.
+ EVENT_FLAG_RBUTTON = 2, //!< indicates that the right mouse button is down.
+ EVENT_FLAG_MBUTTON = 4, //!< indicates that the middle mouse button is down.
+ EVENT_FLAG_CTRLKEY = 8, //!< indicates that CTRL Key is pressed.
+ EVENT_FLAG_SHIFTKEY = 16,//!< indicates that SHIFT Key is pressed.
+ EVENT_FLAG_ALTKEY = 32 //!< indicates that ALT Key is pressed.
};
//! Qt font weight
enum QtFontWeights {
- QT_FONT_LIGHT = 25, //!< QFont::Light ( Weight of 25 )
- QT_FONT_NORMAL = 50, //!< QFont::Normal ( Weight of 50 )
- QT_FONT_DEMIBOLD = 63, //!< QFont::DemiBold ( Weight of 63 )
- QT_FONT_BOLD = 75, //!< QFont::Bold ( Weight of 75 )
- QT_FONT_BLACK = 87 //!< QFont::Black ( Weight of 87 )
+ QT_FONT_LIGHT = 25, //!< Weight of 25
+ QT_FONT_NORMAL = 50, //!< Weight of 50
+ QT_FONT_DEMIBOLD = 63, //!< Weight of 63
+ QT_FONT_BOLD = 75, //!< Weight of 75
+ QT_FONT_BLACK = 87 //!< Weight of 87
};
//! Qt font style
enum QtFontStyles {
- QT_STYLE_NORMAL = 0, //!< QFont::StyleNormal
- QT_STYLE_ITALIC = 1, //!< QFont::StyleItalic
- QT_STYLE_OBLIQUE = 2 //!< QFont::StyleOblique
+ QT_STYLE_NORMAL = 0, //!< Normal font.
+ QT_STYLE_ITALIC = 1, //!< Italic font.
+ QT_STYLE_OBLIQUE = 2 //!< Oblique font.
};
//! Qt "button" type
enum QtButtonTypes {
- QT_PUSH_BUTTON = 0, //!< Push button
- QT_CHECKBOX = 1, //!< Checkbox button
- QT_RADIOBOX = 2 //!< Radiobox button
+ QT_PUSH_BUTTON = 0, //!< Push button.
+ QT_CHECKBOX = 1, //!< Checkbox button.
+ QT_RADIOBOX = 2 //!< Radiobox button.
};
-
+/** @brief Callback function for mouse events. see cv::setMouseCallback
+@param event one of the cv::MouseEventTypes constants.
+@param x The x-coordinate of the mouse event.
+@param y The y-coordinate of the mouse event.
+@param flags one of the cv::MouseEventFlags constants.
+@param userdata The optional parameter.
+ */
typedef void (*MouseCallback)(int event, int x, int y, int flags, void* userdata);
+
+/** @brief Callback function for Trackbar see cv::createTrackbar
+@param pos current position of the specified trackbar.
+@param userdata The optional parameter.
+ */
typedef void (*TrackbarCallback)(int pos, void* userdata);
+
+/** @brief Callback function defined to be called every frame. See cv::setOpenGlDrawCallback
+@param userdata The optional parameter.
+ */
typedef void (*OpenGlDrawCallback)(void* userdata);
+
+/** @brief Callback function for a button created by cv::createButton
+@param state current state of the button. It could be -1 for a push button, 0 or 1 for a check/radio box button.
+@param userdata The optional parameter.
+ */
typedef void (*ButtonCallback)(int state, void* userdata);
/** @brief Creates a window.
-@param winname Name of the window in the window caption that may be used as a window identifier.
-@param flags Flags of the window. The supported flags are: (cv::WindowFlags)
-
The function namedWindow creates a window that can be used as a placeholder for images and
trackbars. Created windows are referred to by their names.
- **CV_GUI_NORMAL or CV_GUI_EXPANDED:** CV_GUI_NORMAL is the old way to draw the window
without statusbar and toolbar, whereas CV_GUI_EXPANDED is a new enhanced GUI.
By default, flags == WINDOW_AUTOSIZE | WINDOW_KEEPRATIO | CV_GUI_EXPANDED
+
+@param winname Name of the window in the window caption that may be used as a window identifier.
+@param flags Flags of the window. The supported flags are: (cv::WindowFlags)
*/
CV_EXPORTS_W void namedWindow(const String& winname, int flags = WINDOW_AUTOSIZE);
-/** @brief Destroys a window.
-
-@param winname Name of the window to be destroyed.
+/** @brief Destroys the specified window.
The function destroyWindow destroys the window with the given name.
+
+@param winname Name of the window to be destroyed.
*/
CV_EXPORTS_W void destroyWindow(const String& winname);
/** @brief Waits for a pressed key.
-@param delay Delay in milliseconds. 0 is the special value that means "forever".
-
The function waitKey waits for a key event infinitely (when \f$\texttt{delay}\leq 0\f$ ) or for delay
milliseconds, when it is positive. Since the OS has a minimum time between switching threads, the
function will not wait exactly delay ms, it will wait at least delay ms, depending on what else is
The function only works if there is at least one HighGUI window created and the window is active.
If there are several HighGUI windows, any of them can be active.
+
+@param delay Delay in milliseconds. 0 is the special value that means "forever".
*/
CV_EXPORTS_W int waitKey(int delay = 0);
/** @brief Displays an image in the specified window.
-@param winname Name of the window.
-@param mat Image to be shown.
-
The function imshow displays an image in the specified window. If the window was created with the
-WINDOW_AUTOSIZE flag, the image is shown with its original size, however it is still limited by the screen resolution.
+cv::WINDOW_AUTOSIZE flag, the image is shown with its original size, however it is still limited by the screen resolution.
Otherwise, the image is scaled to fit the window. The function may scale the image, depending on its depth:
- If the image is 8-bit unsigned, it is displayed as is.
- If the image is 32-bit floating-point, the pixel values are multiplied by 255. That is, the
value range [0,1] is mapped to [0,255].
-If window was created with OpenGL support, imshow also support ogl::Buffer , ogl::Texture2D and
+If window was created with OpenGL support, cv::imshow also support ogl::Buffer , ogl::Texture2D and
cuda::GpuMat as input.
-If the window was not created before this function, it is assumed creating a window with WINDOW_AUTOSIZE.
+If the window was not created before this function, it is assumed creating a window with cv::WINDOW_AUTOSIZE.
If you need to show an image that is bigger than the screen resolution, you will need to call namedWindow("", WINDOW_NORMAL) before the imshow.
@note This function should be followed by cv::waitKey function which displays the image for specified
-milliseconds. Otherwise, it won't display the image. For example, cv::waitKey(0) will display the window
-infinitely until any keypress (it is suitable for image display). cv::waitKey(25) will display a frame
+milliseconds. Otherwise, it won't display the image. For example, **waitKey(0)** will display the window
+infinitely until any keypress (it is suitable for image display). **waitKey(25)** will display a frame
for 25 ms, after which display will be automatically closed. (If you put it in a loop to read
videos, it will display the video frame-by-frame)
@note
-[Windows Backend Only] Pressing Ctrl+C will copy the image to the clipboard.
+[__Windows Backend Only__] Pressing Ctrl+C will copy the image to the clipboard.
-[Windows Backend Only] Pressing Ctrl+S will show a dialog to save the image.
+[__Windows Backend Only__] Pressing Ctrl+S will show a dialog to save the image.
+@param winname Name of the window.
+@param mat Image to be shown.
*/
CV_EXPORTS_W void imshow(const String& winname, InputArray mat);
/** @brief Resizes window to the specified size
-@param winname Window name
-@param width The new window width
-@param height The new window height
-
@note
- The specified window size is for the image area. Toolbars are not counted.
-- Only windows created without WINDOW_AUTOSIZE flag can be resized.
+- Only windows created without cv::WINDOW_AUTOSIZE flag can be resized.
+
+@param winname Window name.
+@param width The new window width.
+@param height The new window height.
*/
CV_EXPORTS_W void resizeWindow(const String& winname, int width, int height);
/** @brief Moves window to the specified position
-@param winname Window name
-@param x The new x-coordinate of the window
-@param y The new y-coordinate of the window
+@param winname Name of the window.
+@param x The new x-coordinate of the window.
+@param y The new y-coordinate of the window.
*/
CV_EXPORTS_W void moveWindow(const String& winname, int x, int y);
/** @brief Changes parameters of a window dynamically.
+The function setWindowProperty enables changing properties of a window.
+
@param winname Name of the window.
@param prop_id Window property to edit. The supported operation flags are: (cv::WindowPropertyFlags)
@param prop_value New value of the window property. The supported flags are: (cv::WindowFlags)
-
-The function setWindowProperty enables changing properties of a window.
*/
CV_EXPORTS_W void setWindowProperty(const String& winname, int prop_id, double prop_value);
/** @brief Updates window title
+@param winname Name of the window.
+@param title New title.
*/
CV_EXPORTS_W void setWindowTitle(const String& winname, const String& title);
/** @brief Provides parameters of a window.
+The function getWindowProperty returns properties of a window.
+
@param winname Name of the window.
@param prop_id Window property to retrieve. The following operation flags are available: (cv::WindowPropertyFlags)
-See setWindowProperty to know the meaning of the returned values.
-
-The function getWindowProperty returns properties of a window.
+@sa setWindowProperty
*/
CV_EXPORTS_W double getWindowProperty(const String& winname, int prop_id);
/** @brief Sets mouse handler for the specified window
-@param winname Window name
+@param winname Name of the window.
@param onMouse Mouse callback. See OpenCV samples, such as
<https://github.com/Itseez/opencv/tree/master/samples/cpp/ffilldemo.cpp>, on how to specify and
use the callback.
*/
CV_EXPORTS void setMouseCallback(const String& winname, MouseCallback onMouse, void* userdata = 0);
-/** @brief Gets the mouse-wheel motion delta, when handling mouse-wheel events EVENT_MOUSEWHEEL and
-EVENT_MOUSEHWHEEL.
-
-@param flags The mouse callback flags parameter.
+/** @brief Gets the mouse-wheel motion delta, when handling mouse-wheel events cv::EVENT_MOUSEWHEEL and
+cv::EVENT_MOUSEHWHEEL.
For regular mice with a scroll-wheel, delta will be a multiple of 120. The value 120 corresponds to
a one notch rotation of the wheel or the threshold for action to be taken and one such action should
occur for each delta. Some high-precision mice with higher-resolution freely-rotating wheels may
generate smaller values.
-For EVENT_MOUSEWHEEL positive and negative values mean forward and backward scrolling,
-respectively. For EVENT_MOUSEHWHEEL, where available, positive and negative values mean right and
+For cv::EVENT_MOUSEWHEEL positive and negative values mean forward and backward scrolling,
+respectively. For cv::EVENT_MOUSEHWHEEL, where available, positive and negative values mean right and
left scrolling, respectively.
With the C API, the macro CV_GET_WHEEL_DELTA(flags) can be used alternatively.
@note
Mouse-wheel events are currently supported only on Windows.
+
+@param flags The mouse callback flags parameter.
*/
CV_EXPORTS int getMouseWheelDelta(int flags);
/** @brief Creates a trackbar and attaches it to the specified window.
-@param trackbarname Name of the created trackbar.
-@param winname Name of the window that will be used as a parent of the created trackbar.
-@param value Optional pointer to an integer variable whose value reflects the position of the
-slider. Upon creation, the slider position is defined by this variable.
-@param count Maximal position of the slider. The minimal position is always 0.
-@param onChange Pointer to the function to be called every time the slider changes position. This
-function should be prototyped as void Foo(int,void\*); , where the first parameter is the trackbar
-position and the second parameter is the user data (see the next parameter). If the callback is
-the NULL pointer, no callbacks are called, but only value is updated.
-@param userdata User data that is passed as is to the callback. It can be used to handle trackbar
-events without using global variables.
-
The function createTrackbar creates a trackbar (a slider or range control) with the specified name
and range, assigns a variable value to be a position synchronized with the trackbar and specifies
the callback function onChange to be called on the trackbar position change. The created trackbar is
@note
-**[Qt Backend Only]** winname can be empty (or NULL) if the trackbar should be attached to the
+[__Qt Backend Only__] winname can be empty (or NULL) if the trackbar should be attached to the
control panel.
Clicking the label of each trackbar enables editing the trackbar values manually.
+@param trackbarname Name of the created trackbar.
+@param winname Name of the window that will be used as a parent of the created trackbar.
+@param value Optional pointer to an integer variable whose value reflects the position of the
+slider. Upon creation, the slider position is defined by this variable.
+@param count Maximal position of the slider. The minimal position is always 0.
+@param onChange Pointer to the function to be called every time the slider changes position. This
+function should be prototyped as void Foo(int,void\*); , where the first parameter is the trackbar
+position and the second parameter is the user data (see the next parameter). If the callback is
+the NULL pointer, no callbacks are called, but only value is updated.
+@param userdata User data that is passed as is to the callback. It can be used to handle trackbar
+events without using global variables.
*/
CV_EXPORTS int createTrackbar(const String& trackbarname, const String& winname,
int* value, int count,
/** @brief Returns the trackbar position.
-@param trackbarname Name of the trackbar.
-@param winname Name of the window that is the parent of the trackbar.
-
The function returns the current position of the specified trackbar.
@note
-**[Qt Backend Only]** winname can be empty (or NULL) if the trackbar is attached to the control
+[__Qt Backend Only__] winname can be empty (or NULL) if the trackbar is attached to the control
panel.
+@param trackbarname Name of the trackbar.
+@param winname Name of the window that is the parent of the trackbar.
*/
CV_EXPORTS_W int getTrackbarPos(const String& trackbarname, const String& winname);
/** @brief Sets the trackbar position.
-@param trackbarname Name of the trackbar.
-@param winname Name of the window that is the parent of trackbar.
-@param pos New position.
-
The function sets the position of the specified trackbar in the specified window.
@note
-**[Qt Backend Only]** winname can be empty (or NULL) if the trackbar is attached to the control
+[__Qt Backend Only__] winname can be empty (or NULL) if the trackbar is attached to the control
panel.
+
+@param trackbarname Name of the trackbar.
+@param winname Name of the window that is the parent of trackbar.
+@param pos New position.
*/
CV_EXPORTS_W void setTrackbarPos(const String& trackbarname, const String& winname, int pos);
/** @brief Sets the trackbar maximum position.
-@param trackbarname Name of the trackbar.
-@param winname Name of the window that is the parent of trackbar.
-@param maxval New maximum position.
-
The function sets the maximum position of the specified trackbar in the specified window.
@note
-**[Qt Backend Only]** winname can be empty (or NULL) if the trackbar is attached to the control
+[__Qt Backend Only__] winname can be empty (or NULL) if the trackbar is attached to the control
panel.
+
+@param trackbarname Name of the trackbar.
+@param winname Name of the window that is the parent of trackbar.
+@param maxval New maximum position.
*/
CV_EXPORTS_W void setTrackbarMax(const String& trackbarname, const String& winname, int maxval);
//! @addtogroup highgui_opengl OpenGL support
//! @{
+/** @brief Displays OpenGL 2D texture in the specified window.
+
+@param winname Name of the window.
+@param tex OpenGL 2D texture data.
+ */
CV_EXPORTS void imshow(const String& winname, const ogl::Texture2D& tex);
/** @brief Sets a callback function to be called to draw on top of displayed image.
-@param winname Name of the window.
-@param onOpenGlDraw Pointer to the function to be called every frame. This function should be
-prototyped as void Foo(void\*) .
-@param userdata Pointer passed to the callback function. *(Optional)*
-
The function setOpenGlDrawCallback can be used to draw 3D data on the window. See the example of
-callback function below: :
+callback function below:
@code
void on_opengl(void* param)
{
}
}
@endcode
+
+@param winname Name of the window.
+@param onOpenGlDraw Pointer to the function to be called every frame. This function should be
+prototyped as void Foo(void\*) .
+@param userdata Pointer passed to the callback function.(__Optional__)
*/
CV_EXPORTS void setOpenGlDrawCallback(const String& winname, OpenGlDrawCallback onOpenGlDraw, void* userdata = 0);
/** @brief Sets the specified window as current OpenGL context.
-@param winname Window name
+@param winname Name of the window.
*/
CV_EXPORTS void setOpenGlContext(const String& winname);
-/** @brief Force window to redraw its context and call draw callback ( setOpenGlDrawCallback ).
+/** @brief Force window to redraw its context and call draw callback ( See cv::setOpenGlDrawCallback ).
-@param winname Window name
+@param winname Name of the window.
*/
CV_EXPORTS void updateWindow(const String& winname);
//! @addtogroup highgui_qt
//! @{
-// Only for Qt
+/** @brief QtFont available only for Qt. See cv::fontQt
+ */
struct QtFont
{
- const char* nameFont; // Qt: nameFont
- Scalar color; // Qt: ColorFont -> cvScalar(blue_component, green_component, red_component[, alpha_component])
- int font_face; // Qt: bool italic
- const int* ascii; // font data and metrics
+ const char* nameFont; //!< Name of the font
+ Scalar color; //!< Color of the font. Scalar(blue_component, green_component, red_component[, alpha_component])
+ int font_face; //!< See cv::QtFontStyles
+ const int* ascii; //!< font data and metrics
const int* greek;
const int* cyrillic;
float hscale, vscale;
- float shear; // slope coefficient: 0 - normal, >0 - italic
- int thickness; // Qt: weight
- float dx; // horizontal interval between letters
- int line_type; // Qt: PointSize
+ float shear; //!< slope coefficient: 0 - normal, >0 - italic
+ int thickness; //!< See cv::QtFontWeights
+ float dx; //!< horizontal interval between letters
+ int line_type; //!< PointSize
};
/** @brief Creates the font to draw a text on an image.
+The function fontQt creates a cv::QtFont object. This cv::QtFont is not compatible with putText .
+
+A basic usage of this function is the following: :
+@code
+ QtFont font = fontQt("Times");
+ addText( img1, "Hello World !", Point(50,50), font);
+@endcode
+
@param nameFont Name of the font. The name should match the name of a system font (such as
*Times*). If the font is not found, a default one is used.
@param pointSize Size of the font. If not specified, equal zero or negative, the point size of the
font is set to a system-dependent default value. Generally, this is 12 points.
-@param color Color of the font in BGRA where A = 255 is fully transparent. Use the macro CV _ RGB
+@param color Color of the font in BGRA where A = 255 is fully transparent. Use the macro CV_RGB
for simplicity.
-@param weight Font weight. Available operation flags are : (cv::QtFontWeights) You can also specify a positive integer for better control.
-@param style Font style. The following operation flags are available: (cv::QtFontStyles)
+@param weight Font weight. Available operation flags are : cv::QtFontWeights You can also specify a positive integer for better control.
+@param style Font style. Available operation flags are : cv::QtFontStyles
@param spacing Spacing between characters. It can be negative or positive.
-
-The function fontQt creates a QtFont object. This QtFont is not compatible with putText .
-
-A basic usage of this function is the following: :
-@code
- QtFont font = fontQt(''Times'');
- addText( img1, ``Hello World !'', Point(50,50), font);
-@endcode
*/
CV_EXPORTS QtFont fontQt(const String& nameFont, int pointSize = -1,
Scalar color = Scalar::all(0), int weight = QT_FONT_NORMAL,
int style = QT_STYLE_NORMAL, int spacing = 0);
-/** @brief Creates the font to draw a text on an image.
+/** @brief Draws a text on the image.
+
+The function addText draws *text* on the image *img* using a specific font *font* (see example cv::fontQt
+)
@param img 8-bit 3-channel image where the text should be drawn.
@param text Text to write on an image.
@param org Point(x,y) where the text should start on an image.
@param font Font to use to draw a text.
-
-The function addText draws *text* on an image *img* using a specific font *font* (see example cv::fontQt
-)
*/
CV_EXPORTS void addText( const Mat& img, const String& text, Point org, const QtFont& font);
/** @brief Displays a text on a window image as an overlay for a specified duration.
+The function displayOverlay displays useful information/tips on top of the window for a certain
+amount of time *delayms*. The function does not modify the image, displayed in the window, that is,
+after the specified delay the original content of the window is restored.
+
@param winname Name of the window.
@param text Overlay text to write on a window image.
@param delayms The period (in milliseconds), during which the overlay text is displayed. If this
function is called before the previous overlay text timed out, the timer is restarted and the text
is updated. If this value is zero, the text never disappears.
-
-The function displayOverlay displays useful information/tips on top of the window for a certain
-amount of time *delayms*. The function does not modify the image, displayed in the window, that is,
-after the specified delay the original content of the window is restored.
*/
CV_EXPORTS void displayOverlay(const String& winname, const String& text, int delayms = 0);
/** @brief Displays a text on the window statusbar during the specified period of time.
+The function displayStatusBar displays useful information/tips on top of the window for a certain
+amount of time *delayms* . This information is displayed on the window statusbar (the window must be
+created with the CV_GUI_EXPANDED flags).
+
@param winname Name of the window.
@param text Text to write on the window statusbar.
@param delayms Duration (in milliseconds) to display the text. If this function is called before
the previous text timed out, the timer is restarted and the text is updated. If this value is
zero, the text never disappears.
-
-The function displayStatusBar displays useful information/tips on top of the window for a certain
-amount of time *delayms* . This information is displayed on the window statusbar (the window must be
-created with the CV_GUI_EXPANDED flags).
*/
CV_EXPORTS void displayStatusBar(const String& winname, const String& text, int delayms = 0);
/** @brief Saves parameters of the specified window.
-@param windowName Name of the window.
-
The function saveWindowParameters saves size, location, flags, trackbars value, zoom and panning
-location of the window window_name .
+location of the window windowName.
+
+@param windowName Name of the window.
*/
CV_EXPORTS void saveWindowParameters(const String& windowName);
/** @brief Loads parameters of the specified window.
-@param windowName Name of the window.
-
The function loadWindowParameters loads size, location, flags, trackbars value, zoom and panning
-location of the window window_name .
+location of the window windowName.
+
+@param windowName Name of the window.
*/
CV_EXPORTS void loadWindowParameters(const String& windowName);
/** @brief Attaches a button to the control panel.
-@param bar_name
- Name of the button.
-@param on_change Pointer to the function to be called every time the button changes its state.
-This function should be prototyped as void Foo(int state,\*void); . *state* is the current state
-of the button. It could be -1 for a push button, 0 or 1 for a check/radio box button.
-@param userdata Pointer passed to the callback function.
-@param type Optional type of the button. Available types are: (cv::QtButtonTypes)
-@param initial_button_state Default state of the button. Use for checkbox and radiobox. Its
-value could be 0 or 1. *(Optional)*
-
The function createButton attaches a button to the control panel. Each button is added to a
buttonbar to the right of the last button. A new buttonbar is created if nothing was attached to the
control panel before, or if the last element attached to the control panel was a trackbar.
-See below various examples of the createButton function call: :
+See below various examples of the cv::createButton function call: :
@code
createButton(NULL,callbackButton);//create a push button "button 0", that will call callbackButton.
createButton("button2",callbackButton,NULL,QT_CHECKBOX,0);
createButton("button5",callbackButton1,NULL,QT_RADIOBOX);
createButton("button6",callbackButton2,NULL,QT_PUSH_BUTTON,1);
@endcode
+
+@param bar_name Name of the button.
+@param on_change Pointer to the function to be called every time the button changes its state.
+This function should be prototyped as void Foo(int state,\*void); . *state* is the current state
+of the button. It could be -1 for a push button, 0 or 1 for a check/radio box button.
+@param userdata Pointer passed to the callback function.
+@param type Optional type of the button. Available types are: (cv::QtButtonTypes)
+@param initial_button_state Default state of the button. Use for checkbox and radiobox. Its
+value could be 0 or 1. (__Optional__)
*/
CV_EXPORTS int createButton( const String& bar_name, ButtonCallback on_change,
void* userdata = 0, int type = QT_PUSH_BUTTON,
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