drawing text issue
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I want to draw TEXT directly into view, not using RS_Text, but the "ABCD" could not be displayed ...
Anybody know what's the problems ? void QC_ApplicationWindow::testFont() { RS_PainterQt painter(getMDIWindow()->getGraphicView()->PixmapLayer2); painter.setPen(0,0,255); painter.drawText(0,0,"ABCD"); painter.end(); getGraphicView()->redraw(); } |
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Hi Johnson,
You can draw text efficiently(see the patch). CAD uses stick fonts because all fonts are drawn as lines(polylines) and can be converted to CAD entities. I'm wondering if it's okay to support ordinary fonts, and only revert back to stick fonts when converting is needed. This means efficiency and easy support for all languages. For the time being, let's fix bugs in 2.0 for a stable release. After that, we implement new features in 2.1. Thanks, dxli diff --git a/librecad/src/lib/gui/rs_graphicview.cpp b/librecad/src/lib/gui/rs_graphicview.cpp index 726286d..4ee6364 100644 --- a/librecad/src/lib/gui/rs_graphicview.cpp +++ b/librecad/src/lib/gui/rs_graphicview.cpp @@ -28,6 +28,7 @@ #include <limits.h> #include "qc_applicationwindow.h" #include "rs_graphicview.h" +#include "rs_painterqt.h" #include "rs_linetypepattern.h" #include "rs_eventhandler.h" @@ -1094,6 +1095,13 @@ void RS_GraphicView::drawLayer2(RS_Painter *painter) // ---------------------------------------------------------- if (!isPrintPreview()) drawAbsoluteZero(painter); + RS_PainterQt* p0=dynamic_cast<RS_PainterQt*>(painter); + if(p0) { + DEBUG_HEADER(); + p0->setPen(0,0,255); + p0->setFont(QFont("Times", 20, QFont::Bold)); + p0->drawText(100, 100, 100, 100, Qt::AlignHCenter, "ABCD"); + } } |
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Hi Dxli
Yeah. It works. the text could not be stored into DXF
file. I understand that because the "ABCD" could NOT be converted to CAD
entities. ( it's not a rs_entity too )
But I am confused why my below code could not work as expected.
----
void QC_ApplicationWindow::testFont()
{ RS_PainterQt painter(getMDIWindow()->getGraphicView()->PixmapLayer2); painter.setPen(0,0,255); painter.drawText(0,0,"ABCD"); painter.end(); getGraphicView()->redraw(); } ----
After that, QG_GraphicView::paintEvent will be called too. ..
why the result is not like as your result with your code.
My another question is that now it seems even not response to "zoom in" /
"zoom out " ,keep the size forever, can I fix that to response to
zoom in /out ? Thanks.
About your "For the time being, let's fix bugs in 2.0 for a stable release.
After that, we implement new features in 2.1. ". do you mean you will fix
this issue (still use stick font ) in later release ?
wingame82
Hi Johnson, You can draw text efficiently(see the patch). CAD uses stick fonts because all fonts are drawn as lines(polylines) and can be converted to CAD entities. I'm wondering if it's okay to support ordinary fonts, and only revert back to stick fonts when converting is needed. This means efficiency and easy support for all languages. For the time being, let's fix bugs in 2.0 for a stable release. After that, we implement new features in 2.1. Thanks, dxli diff --git a/librecad/src/lib/gui/rs_graphicview.cpp b/librecad/src/lib/gui/rs_graphicview.cpp index 726286d..4ee6364 100644 --- a/librecad/src/lib/gui/rs_graphicview.cpp +++ b/librecad/src/lib/gui/rs_graphicview.cpp @@ -28,6 +28,7 @@ #include <limits.h> #include "qc_applicationwindow.h" #include "rs_graphicview.h" +#include "rs_painterqt.h" #include "rs_linetypepattern.h" #include "rs_eventhandler.h" @@ -1094,6 +1095,13 @@ void RS_GraphicView::drawLayer2(RS_Painter *painter) // ---------------------------------------------------------- if (!isPrintPreview()) drawAbsoluteZero(painter); + RS_PainterQt* p0=dynamic_cast<RS_PainterQt*>(painter); + if(p0) { + DEBUG_HEADER(); + p0->setPen(0,0,255); + p0->setFont(QFont("Times", 20, QFont::Bold)); + p0->drawText(100, 100, 100, 100, Qt::AlignHCenter, "ABCD"); + } } If you reply to this email, your message will be
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In reply to this post by dxli
Hi, DxLi and Rallaz
Currently I don't need CAD purpose , so I could use system QT fonts .
But my difficulities now is that
1. where should the place I insert each text ? Is there any other
place rather than drawLayer2 because this function will be drawn by paintEvent
as soon as update is called.
2. my requirement is to draw a line , on the left up
place of the line, I will draft a line.
I think I could use RS_Line entity and drawText function
with system QT font.
but the problem now is that if I zoom in/out the
view, the RS_line will be changed correspondingly, but the text won't
changed.
Could you kindly guide me where to implement this feature ? Thanks.
wingame82 Hi Johnson, You can draw text efficiently(see the patch). CAD uses stick fonts because all fonts are drawn as lines(polylines) and can be converted to CAD entities. I'm wondering if it's okay to support ordinary fonts, and only revert back to stick fonts when converting is needed. This means efficiency and easy support for all languages. For the time being, let's fix bugs in 2.0 for a stable release. After that, we implement new features in 2.1. Thanks, dxli diff --git a/librecad/src/lib/gui/rs_graphicview.cpp b/librecad/src/lib/gui/rs_graphicview.cpp index 726286d..4ee6364 100644 --- a/librecad/src/lib/gui/rs_graphicview.cpp +++ b/librecad/src/lib/gui/rs_graphicview.cpp @@ -28,6 +28,7 @@ #include <limits.h> #include "qc_applicationwindow.h" #include "rs_graphicview.h" +#include "rs_painterqt.h" #include "rs_linetypepattern.h" #include "rs_eventhandler.h" @@ -1094,6 +1095,13 @@ void RS_GraphicView::drawLayer2(RS_Painter *painter) // ---------------------------------------------------------- if (!isPrintPreview()) drawAbsoluteZero(painter); + RS_PainterQt* p0=dynamic_cast<RS_PainterQt*>(painter); + if(p0) { + DEBUG_HEADER(); + p0->setPen(0,0,255); + p0->setFont(QFont("Times", 20, QFont::Bold)); + p0->drawText(100, 100, 100, 100, Qt::AlignHCenter, "ABCD"); + } } If you reply to this email, your message will be
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Hi Johnson,
I'm thinking about adding a feature to the RS_Text RS_MText entities. like: bool m_bUseNativeFonts; //default to true in the RS_Text::draw() method, you implement drawing native drawText() (should be added from in RS_PainterQt()), according to color, scaling factor, orientation, etc. For zooming, please note we have a model space (as entity sizes are), and a screen(GUI) space as controlled by zooming factor. draw() methods must do the conversion. Current font selection is by LibreCAD fonts, we need to implement a selection mechanism for native fonts. I suggest you to share your implementation in LibreCAD license, i.e., GPLv2 or any later version. By doing so, we can we together to get this important feature. Thanks, Dongxu
On Sun, May 26, 2013 at 12:07 PM, Johnson [via LibreCAD] <[hidden email]> wrote:
-- Dongxu Li, Ph.D. www.librecad.org |
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Hi Dxli
I did not see RS_Text::draw() function . could you figure out
which function is your purpose to do this feature ? Thanks.
wingame82
Hi Johnson, I'm thinking about adding a feature to the RS_Text RS_MText entities. like: bool m_bUseNativeFonts; //default to true in the RS_Text::draw() method, you implement drawing native drawText() (should be added from in RS_PainterQt()), according to color, scaling factor, orientation, etc. For zooming, please note we have a model space (as entity sizes are), and a screen(GUI) space as controlled by zooming factor. draw() methods must do the conversion. Current font selection is by LibreCAD fonts, we need to implement a selection mechanism for native fonts. I suggest you to share your implementation in LibreCAD license, i.e., GPLv2 or any later version. By doing so, we can we together to get this important feature. Thanks, Dongxu On Sun, May 26, 2013 at 12:07 PM, Johnson [via LibreCAD]
<[hidden email]> wrote:
-- Dongxu Li, Ph.D. www.librecad.org If you reply to this email, your message will be
added to the discussion below: http://forum.librecad.org/drawing-text-issue-tp5708110p5708122.html
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In reply to this post by dxli
Hi Dxli
I could help on this requirment when I am free.
Another question is that . If I use native text, the saved file
*.dxf won't include those text . I don't need this
requirement currently , but this should be considered in
future, how to resolve this problem from your thinking ?
wingame82
Hi Johnson, I'm thinking about adding a feature to the RS_Text RS_MText entities. like: bool m_bUseNativeFonts; //default to true in the RS_Text::draw() method, you implement drawing native drawText() (should be added from in RS_PainterQt()), according to color, scaling factor, orientation, etc. For zooming, please note we have a model space (as entity sizes are), and a screen(GUI) space as controlled by zooming factor. draw() methods must do the conversion. Current font selection is by LibreCAD fonts, we need to implement a selection mechanism for native fonts. I suggest you to share your implementation in LibreCAD license, i.e., GPLv2 or any later version. By doing so, we can we together to get this important feature. Thanks, Dongxu On Sun, May 26, 2013 at 12:07 PM, Johnson [via LibreCAD]
<[hidden email]> wrote:
-- Dongxu Li, Ph.D. www.librecad.org If you reply to this email, your message will be
added to the discussion below: http://forum.librecad.org/drawing-text-issue-tp5708110p5708122.html
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In reply to this post by Johnson
Hi,
RS_Text is derived from RS_EntityContainer You can define a virtual function draw() in RS_Text then. On Sun, May 26, 2013 at 10:39 PM, Johnson [via LibreCAD] <[hidden email]> wrote:
-- Dongxu Li, Ph.D. www.librecad.org |
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Yes. you're right .
I think I also need to disable update function for rs_text class.
wingame82
Hi, RS_Text is derived from RS_EntityContainer You can define a virtual function draw() in RS_Text then. On Sun, May 26, 2013 at 10:39 PM, Johnson [via LibreCAD]
<[hidden email]> wrote:
-- Dongxu Li, Ph.D. www.librecad.org If you reply to this email, your message will be
added to the discussion below: http://forum.librecad.org/drawing-text-issue-tp5708110p5708125.html
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hi,
I'm a noob in coding and want to learn how to code. So if someone does have some time, can you answer my questions, please: "RS_Text is derived from RS_EntityContainer. You can define a virtual function draw() in RS_Text then." If RS_Text is derived from RS_EntityContainer, shouldn't the draw() function beeing implemented in the RS_EntityContainer class? (cause using virtual??) "For zooming, please note we have a model space (as entity sizes are), and a screen(GUI) space as controlled by zooming factor. draw() methods must do the conversion." What is the model space and the screen space? model space: the canvas, where drwing is performed?? screen space: the GUI?? so one can zoom the GUI?? |
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RS_EntityContainer could not implement draw because this is a "virtual"
class who don't know what's the object to draw.
RS_Text is a special derived RS_EntityContainer class , from the name you
know it's "TEXT".
Yes, I need to do conversion in the implementation of draw . you could
refer to RS_Line class.
Other question leave to other expert to answer :)
wingame82
hi, I'm a noob in coding and want to learn how to code. So if someone does have some time, can you answer my questions, please: "RS_Text is derived from RS_EntityContainer. You can define a virtual function draw() in RS_Text then." If RS_Text is derived from RS_EntityContainer, shouldn't the draw() function beeing implemented in the RS_EntityContainer class? (cause using virtual??) "For zooming, please note we have a model space (as entity sizes are), and a screen(GUI) space as controlled by zooming factor. draw() methods must do the conversion." What is the model space and the screen space? model space: the canvas, where drwing is performed?? screen space: the GUI?? so one can zoom the GUI?? If you reply to this email, your message will be
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thx for the fast answer.
Why should the draw function be virtual? I thought that virtual should be used if you want to derive from this class (so thats why I thought draw should be implemented in RS_EntityContainer). Or are there classes which are derived from RS_Text? |
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RS_Entity and RS_EntityContainer ( contains many RS_Entitys... )is an
Abstract class which is the base class for basic graphic class such as RS_line
and RS_Circle etc.
wingame82
thx for the fast answer. Why should the draw function be virtual? I thought that virtual should be used if you want to derive from this class (so thats why I thought draw should be implemented in RS_EntityContainer). Or are there classes which are derived from RS_Text? If you reply to this email, your message will be
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