#MOUSE COORDINATES IN QT SOFTWARE#

The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Returns the position of the point in this event, relative to the window or scene.ĭocumentation contributions included herein are the copyrights of QPointF QSinglePointEvent:: scenePosition() const If you move your widgets around in response to mouse events, use globalPosition() instead. Returns the position of the point in this event, relative to the widget or item that received the event. As far as using the MouseArea over top of a Map, this is currently a known issue. On a touch screen, there isn't really a concept of hovering, so this isn't an issue here. QPointF QSinglePointEvent:: position() const The only caveat is that if you are using a desktop that has a mouse (as opposed to a touch mobile device), you need to actually press and hold the mouse to get the coordinates. Returns true if this event does not include a change in button state. bool QSinglePointEvent:: isUpdateEvent() const Returns true if this event represents a button being released. bool QSinglePointEvent:: isEndEvent() const Returns true if this event represents a button being pressed. bool QSinglePointEvent:: isBeginEvent() const This is important on asynchronous window systems such as X11 whenever you move your widgets around in response to mouse events, globalPosition() can differ a lot from the current cursor position returned by QCursor::pos(). ScreenCoordY = -self.height()*ndcCoord/2 + self.Note: The global position of a mouse pointer is recorded at the time of the event. ScreenCoordX = self.width()*ndcCoord/2 + self.width()/2 My code: vertex = np.matrix().TĮyeCoord = self.matView*self.matModel*vertex However, I do not manage to reverse the problem to find the vertex. In fact, I simulated what OpenGL does as explained here: Indeed, I compare such coordinates with those of my mouse when it is located over the initial vertex ((1,1) = upper right) and it works. This is important on asynchronous window systems like X11. I manage to solve the inverse (direct) problem consisting in computing, for a given vertex (for example (1,1)) the location where it should appear on screen. Returns the global position of the mouse pointer at the time of the event. GlUniformMatrix4fv(loc, 1, False, np.ascontiguousarray()) Loc = glGetUniformLocation(self.shaderProgram, 'Projection') Self.matView = fn.lookat(np.array(), np.array(), np.array()) Loc = glGetUniformLocation(self.shaderProgram, 'Model') Self.shaderProgram = pileProgram(vertexShader, fragmentShader)

VertexShader = pileShader(VERTEX_SHADER, GL_VERTEX_SHADER)įragmentShader = pileShader(FRAGMENT_SHADER, GL_FRAGMENT_SHADER) Self.viewport = fn.viewport(0, 0, self.width(), self.height()) The initializeGL function: def initializeGL(self): Loc = glGetUniformLocation(self.shaderProgram, 'View') Self.matView = fn.lookat(self.camEye, self.camTarget, self.camUp) The method called on the wheel event: def wheelEvent(self, e): These values are p and p for the four vertices. So, I guess there is something wrong in my code… But when I move my mouse to a corner I do not get any ☑ coordinates. Gl_Position = Projection*View*Model*vec4(scale*position, 0.0, 1.0) I also provide my vertex shader: VERTEX_SHADER = ''' The matView matrix is the only one which change through mouse events in my app. On a touch screen, there isnt really a concept of hovering, so this isnt an issue here. The matModel is always the identity matrix (numpy.eye(4)) while the matView and matProj matrices are computed thanks to the lookat(eye, target, up) and perspective(fovy, aspect, near, far) previously provided by GClements. The only caveat is that if you are using a desktop that has a mouse (as opposed to a touch mobile device), you need to actually press and hold the mouse to get the coordinates. Proj = np.asarray(matProj), view = viewport) X, y, z = GLU.gluUnProject(float(self.mouseX), float(self.mouseY), float(z), model = modelViewMatrix, To do so, I wrote this: modelViewMatrix = np.asarray(matView*matModel) If all you want to do is to report position of the mouse in coordinates as if the widgets lower-left corner was (0,0) and Y was ascending when going up. I am trying to retrieve my mouse coordinates (in a QGLWidget through Qt) to estimate its current 2D coordinates in the virtual world (all my vertices have z=0).

Mouse coordinates in qt