Noli,
Right, zsj's script is what you want - its fun and works quite well.
But to make it work you need to launch and application process (like QGIS does)
and attach the widget.
I've placed the code here for you to get at:
http://bitbucket.org/dodobas/haosbuilder/
On Jul 22, 2010, at 7:42 PM, Noli Sicad wrote:
> Hi,
>
> I have been looking for simple application in python i..e. PyQt that
> has map canvas to render shapefile or spatialite.
Well, given styling logic, right?
Thats the nice thing about QGIS - it gives you a pretty solid environment to
create the styles.
>
> I like QGIS, however, qgis.core and qgis.gui is only available when
> you installed QGIS application. It is not a regular python module.
>
Well, it should be possible, but ya, its rarely done and depending on the build
of QGIS you are using could be tricky in terms of library paths (mac osx in
particular)
> I like to see a simple PyQt4 application with mapnik canvas viewer
> without PyQGIS (QGIS API).
>
> I have been reading the archive of mapnik. I saw these postings.
> http://www.mail-archive.com/[email protected]/msg02736.html
>
> zsj,/ feverzsj, is your "simple pyqt4 widget" that are working
> running now?
Yes, zsj's app is very simple, but quite nice. Other examples using wxpython
include:
http://bitbucket.org/dodobas/haosbuilder/
http://trac.mapnik.org/wiki/IntegrateWithWxPython
> Do you have a complete code to this program now? I run
> your scripts appended the postings, no errors but what do you suppose
> to see? No widget or qt form being rendered.
Right, because the script needs to launch an application. I will attach the
modified code which does that.
Use it like:
$ pyqtmapnik.py /path/to/map.xml
>
> http://www.mail-archive.com/[email protected]/msg02719.html
> http://bitbucket.org/springmeyer/quantumnik/src/tip/quantumnik.py#cl-592
>
> Dane, would be possilbe to have just PyQt with mapnik without QGIS example?
>
zsj's code does that.
> Hope see simple PyQt application with Mapnik viewer / canvas running.
>
Let us know how the attached code goes. It requires a working Mapnik XML
stylesheet.
If you need one, grab the one try this one:
http://bitbucket.org/springmeyer/tilelite/src/tip/demo/
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
import mapnik
from PyQt4.QtCore import *
from PyQt4.QtGui import *
class MapnikWidget(QWidget):
def __init__(self, parent = None):
QWidget.__init__(self, parent)
self.map = mapnik.Map(256, 256)
self.qim = QImage()
self.startDragPos = QPoint()
self.endDragPos = QPoint()
self.drag = False
self.scale = False
self.timer = QTimer()
self.timer.timeout.connect(self.updateMap)
self.total_scale = 1.0
def load_map(self, xml):
self.map = mapnik.Map(256, 256)
mapnik.load_map(self.map, xml)
self.map.resize(self.width(), self.height())
self.zoom_all()
def close_map(self):
self.map = mapnik.Map(256, 256)
self.updateMap()
def updateMap(self):
self.timer.stop()
self.total_scale = 1.0
self.scale = False
im = mapnik.Image(self.map.width, self.map.height)
mapnik.render(self.map, im)
self.qim = QImage(im.tostring(),self.map.width, self.map.height,QImage.Format_ARGB32).rgbSwapped()
#self.qim.loadFromData(QByteArray(im.tostring('png')))
self.update()
def paintEvent(self, event):
painter = QPainter(self)
if self.drag:
painter.drawImage(self.endDragPos - self.startDragPos, self.qim)
elif self.scale:
qw = self.qim.width()
qh = self.qim.height()
newWidth = int(qw * self.total_scale)
newHeight = int(qh * self.total_scale)
newX = (qw - newWidth) / 2
newY = (qh - newHeight) / 2
painter.save()
painter.translate(newX, newY)
painter.scale(self.total_scale, self.total_scale)
exposed = painter.matrix().inverted()[0].mapRect(self.rect()).adjusted(-1, -1, 1, 1)
painter.drawImage(exposed, self.qim, exposed)
painter.restore()
else:
painter.drawImage(0, 0, self.qim)
painter.setPen(QColor(0, 0, 0, 100))
painter.setBrush(QColor(0, 0, 0, 100))
painter.drawRect(0, 0, 256, 26)
painter.setPen(QColor(0, 255 , 0))
painter.drawText(10, 19, 'Scale Denominator: ' + str(self.map.scale_denominator()))
def zoom_all(self):
self.map.zoom_all()
self.updateMap()
def resizeEvent(self, event):
self.map.resize(event.size().width(), event.size().height())
self.updateMap()
def wheelEvent(self, event):
self.scale = True
scale_factor = 1.0 - event.delta() / (360.0 * 8.0) * 4
self.map.zoom(scale_factor)
self.total_scale *= 1 / scale_factor
self.update()
self.timer.start(400)
def mousePressEvent(self, event):
if event.button() == Qt.LeftButton:
self.startDragPos = event.pos()
self.drag = True
def mouseMoveEvent(self, event):
if self.drag:
self.endDragPos = event.pos()
self.update()
def mouseReleaseEvent(self, event):
if event.button() == Qt.LeftButton:
self.drag = False
self.endDragPos = event.pos()
cx = int(0.5 * self.map.width)
cy = int(0.5 * self.map.height)
dpos = self.endDragPos - self.startDragPos
self.map.pan(cx - dpos.x() ,cy - dpos.y())
self.updateMap()
if __name__ == '__main__':
if not len(sys.argv) > 1:
sys.exit('please provide the path to a mapnik xml stylesheet')
app = QApplication(sys.argv)
w = MapnikWidget()
w.show()
w.load_map(sys.argv[1])
sys.exit(app.exec_())
> Thanks.
>
> Regards, Noli
You are welcome.
Dane
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