Showing temperature in a graph.
-
@mrdebug No! i will give it a try, but just wondering, what should i do if i wanted to make a graph widget myself?
edit:
i get this when trying to install qwt on ubuntu 14.04 lts!cd src/ && make -f Makefile
make[1]: Entering directory/home/k/Documents/qwt-6.1.2/src' compiling qwt_abstract_scale_draw.cpp In file included from qwt_abstract_scale_draw.h:13:0, from qwt_abstract_scale_draw.cpp:10: qwt_global.h:13:21: fatal error: qglobal.h: No such file or directory #include <qglobal.h> ^ compilation terminated. make[1]: *** [obj/qwt_abstract_scale_draw.o] Error 1 make[1]: Leaving directory/home/k/Documents/qwt-6.1.2/src'
make: *** [sub-src-make_default-ordered] Error 2 -
You can make one yourself. You need to get the math right or it will be a mess. This is the important parts for how I did mine:
// this is the TViewportMat that is used struct TViewportMat { double tx[2]; double ty[2]; double to[2]; TViewportMat& operator*=(const TViewportMat &rhs) { double x,y,o[2]; x = tx[0] * rhs.tx[0]; y = ty[1] * rhs.ty[1]; o[0] = to[0] * rhs.tx[0] + rhs.to[0]; o[1] = to[1] * rhs.ty[1] + rhs.to[1]; tx[0] = x; ty[1] = y; to[0] = o[0]; to[1] = o[1]; return *this; } void TranslateToWin(const double Xd, const double Yd, int *X, int *Y) const { *X = static_cast<int>(Xd * tx[0] + to[0]); *Y = static_cast<int>(Yd * ty[1] + to[1]); } void TranslateFromWin(const int X,const int Y,double *Xd,double *Yd) const { *Xd = (static_cast<double>(X) - to[0]) / tx[0]; *Yd = (static_cast<double>(Y) - to[1]) / ty[1]; } }; // This updates an instance of 'TViewportMat' based on a combination of your data (the X and Y range) and the size of the widget area you plan to draw on. void TGraphWidget::CalculateViewport(void) { double MinX,MaxX,MinY,MaxY,RangeX,RangeY TViewportMat W,S,V; // find values for MinX, MaxX, MinY, MaxY from your data // make sure difference between Min and Max limits has a minimum value. I use 0.00005. // add a margin by increasing the Min and Max limits slightly W.tx[0] = 1; W.tx[1] = 0; W.ty[0] = 0; W.ty[1] = 1; W.to[0] = -MinX; W.to[1] = -MinY; // d_GraphRect is the rect for the area the graph occupies. // should be the area of the widget or at least the part the graph will occupy S.tx[0] = (d_GraphRect.right() - d_GraphRect.left()) / (MaxX - MinX); S.tx[1] = 0; S.ty[0] = 0; S.ty[1] = (d_GraphRect.top() - d_GraphRect.bottom()) / (MaxY - MinY); S.to[0] = 0; S.to[1] = 0; V.tx[0] = 1; V.tx[1] = 0; V.ty[0] = 0; V.ty[1] = 1; V.to[0] = d_GraphRect.left(); V.to[1] = d_GraphRect.bottom(); d_ViewportMat = W; d_ViewportMat *=S; d_ViewportMat *=V; } // To draw onto the graph area use something like this: d_ViewportMat.TranslateToWin(input_data_x,input_data_y,&X,&Y); Painter->drawLine(LastX,LastY,X,Y); LastX = X; LastY = Y;The member 'TranslateToWin' will convert your input data into window coordinates that you can use to draw with. The member 'TranslateFromWin' takes window coordinates and converts to the graph (I use this to display coordinates when my mouse moves over the graph).
-
You can make one yourself. You need to get the math right or it will be a mess. This is the important parts for how I did mine:
// this is the TViewportMat that is used struct TViewportMat { double tx[2]; double ty[2]; double to[2]; TViewportMat& operator*=(const TViewportMat &rhs) { double x,y,o[2]; x = tx[0] * rhs.tx[0]; y = ty[1] * rhs.ty[1]; o[0] = to[0] * rhs.tx[0] + rhs.to[0]; o[1] = to[1] * rhs.ty[1] + rhs.to[1]; tx[0] = x; ty[1] = y; to[0] = o[0]; to[1] = o[1]; return *this; } void TranslateToWin(const double Xd, const double Yd, int *X, int *Y) const { *X = static_cast<int>(Xd * tx[0] + to[0]); *Y = static_cast<int>(Yd * ty[1] + to[1]); } void TranslateFromWin(const int X,const int Y,double *Xd,double *Yd) const { *Xd = (static_cast<double>(X) - to[0]) / tx[0]; *Yd = (static_cast<double>(Y) - to[1]) / ty[1]; } }; // This updates an instance of 'TViewportMat' based on a combination of your data (the X and Y range) and the size of the widget area you plan to draw on. void TGraphWidget::CalculateViewport(void) { double MinX,MaxX,MinY,MaxY,RangeX,RangeY TViewportMat W,S,V; // find values for MinX, MaxX, MinY, MaxY from your data // make sure difference between Min and Max limits has a minimum value. I use 0.00005. // add a margin by increasing the Min and Max limits slightly W.tx[0] = 1; W.tx[1] = 0; W.ty[0] = 0; W.ty[1] = 1; W.to[0] = -MinX; W.to[1] = -MinY; // d_GraphRect is the rect for the area the graph occupies. // should be the area of the widget or at least the part the graph will occupy S.tx[0] = (d_GraphRect.right() - d_GraphRect.left()) / (MaxX - MinX); S.tx[1] = 0; S.ty[0] = 0; S.ty[1] = (d_GraphRect.top() - d_GraphRect.bottom()) / (MaxY - MinY); S.to[0] = 0; S.to[1] = 0; V.tx[0] = 1; V.tx[1] = 0; V.ty[0] = 0; V.ty[1] = 1; V.to[0] = d_GraphRect.left(); V.to[1] = d_GraphRect.bottom(); d_ViewportMat = W; d_ViewportMat *=S; d_ViewportMat *=V; } // To draw onto the graph area use something like this: d_ViewportMat.TranslateToWin(input_data_x,input_data_y,&X,&Y); Painter->drawLine(LastX,LastY,X,Y); LastX = X; LastY = Y;The member 'TranslateToWin' will convert your input data into window coordinates that you can use to draw with. The member 'TranslateFromWin' takes window coordinates and converts to the graph (I use this to display coordinates when my mouse moves over the graph).
-
@JKSH I get this when i use Qt Creator:
:-1: error: The Qt version is invalid: Qt version is not properly installed, please run make install
My qt creator version is 3.1.2 (based on Qt 3.2.1) its old but i had problems downloading the new version after they changed the websiteand i just ran the .run file i downloaded from the website when i installed it
-
@JKSH I get this when i use Qt Creator:
:-1: error: The Qt version is invalid: Qt version is not properly installed, please run make install
My qt creator version is 3.1.2 (based on Qt 3.2.1) its old but i had problems downloading the new version after they changed the websiteand i just ran the .run file i downloaded from the website when i installed it
-
-
-
@JKSH Oh sorry, i get that when i try to compile it, not when i start qt creator, it actually starts without any errors!
-
@JKSH i press the run button and it gives me this! (with the file open and the project configured)
My Qt creator starts without any errors, once I open the file you mentioned in Qt Creator it asks me to configure it, so I press configure and run it, then it gives me the error I posted before.
