hpgl_qt.py

# -*- coding: utf-8 -*-
import numpy
import pylab
import math
import new # monkey patching...

from PyQt4 import QtGui, QtCore
from PyQt4.QtCore import Qt, SIGNAL

from hpgl_parser import HPGLParser

class QHPGLPlotterWidget(HPGLParser, QtGui.QWidget):
    pen_styles = {2: [0.4, 0.6],
                  3: [0.6, 0.4],
                  4: [0.7, 0.1, 0.1, 0.1],
                  5: [0.6, 0.1, 0.2, 0.1],
                  6: [0.45, 0.1, 0.1, 0.2, 0.1, 0.05],
                  }
    pen_colors = ["black", "green", "red", "blue", "yellow", "cyan", "magenta",
                  "darkred", "darkblue"]
    
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)

        self.qpen = QtGui.QPen(QtCore.Qt.blue)
        self.qbrush = QtGui.QBrush(QtCore.Qt.blue)
        self.qfont = QtGui.QFont('Courier') 
        self.qantialiased = False
        self.qtransformed = False
        self.qscene = QtGui.QGraphicsScene()
        self.qview = QtGui.QGraphicsView(self.qscene, self)
        self.qview.scale(0.5,-0.5)
        l = QtGui.QVBoxLayout(self)
        l.addWidget(self.qview)
        self.setBackgroundRole(QtGui.QPalette.Base)
        self.setSizePolicy(QtGui.QSizePolicy.Expanding,
                           QtGui.QSizePolicy.Expanding)
        HPGLParser.__init__(self)

    def _get_PW(self):
        return self._pen_width
    def _set_PW(self, value):
        value = float(value)
        #print "set pen width", value, value*300.0/75.0
        #self.qpen.setWidthF(value*300.0/75.0)
        self._pen_width = value
    pen_width = property(_get_PW, _set_PW)
        
    def LT(self):
        HPGLParser.LT(self)
        if self.line_type == 0:
            self.qpen.setStyle(Qt.SolidLine)
        elif self.line_type == 1:
            self.qpen.setStyle(Qt.DotLine)
        else:
            pattern = numpy.array(self.pen_styles[self.line_type])
            x0, x1, y0, y1 = self.scale
            dist = math.sqrt((x1-x0)**2 + (y1-y0)**2)
            pattern = self.pattern_len*dist/100.0 * pattern
            if self.qpen.widthF()>0:
                pattern = pattern/self.qpen.widthF()
            self.qpen.setDashPattern(pattern.tolist())
            
    def SP(self):
        HPGLParser.SP(self)
        self.qpen.setColor(QtGui.QColor(self.pen_colors[self.pen]))
        
    def parse(self, data):
        HPGLParser.parse(self, data)
        self.update()
        self.qview.fitInView(self.qscene.sceneRect(), Qt.KeepAspectRatio)
        
    def minimumSizeHint(self):
        return QtCore.QSize(100, 100)

    def sizeHint(self):
        return QtCore.QSize(400, 400)

    def resizeEvent(self, event):
        self.qview.fitInView(self.qscene.sceneRect(), Qt.KeepAspectRatio)
        QtGui.QWidget.resizeEvent(self, event)

    def plot_lines(self, points):
        if len(points) == 1:
            return
        pa = QtGui.QPainterPath()
        pa.addPolygon(QtGui.QPolygonF([QtCore.QPointF(*p) for p in points]))
        self.qscene.addPath(pa, self.qpen)
        
    def plot_symbols(self, points):
        pass
    
    def plot_string(self, s):
        cw, ch = self.get_char_size()
        # this is very ugly and so, but I don't understand haw is
        # computed string positionning in HPGL...
        t0 = self.qscene.addSimpleText(" ", self.qfont) 
        br = t0.boundingRect()
        mw = br.width()
        mh = br.height()
        self.qscene.removeItem(t0)
        # don't ask me why theses constants are here, they seem OK, that's all
        t = self.qscene.addSimpleText(s, self.qfont)
        t.scale(1.5 * cw/mw, -2.0 * ch/mh)
        x, y = self.pos
        t.moveBy(x,y)
        br = t.boundingRect()
        t.moveBy(-0.5*cw, math.sqrt(2)*ch)

        
if __name__=='__main__':
    import sys
    a = QtGui.QApplication(sys.argv)
    mw = QtGui.QMainWindow()
    w = QtGui.QWidget(mw)
    mw.setCentralWidget(w)

    l = QtGui.QVBoxLayout(w)
    p = QHPGLPlotterWidget(w)
    l.addWidget(p, 1)
    b = QtGui.QPushButton("Replot", w)
    l.addWidget(b)
    def plot():
        p.parse(open(sys.argv[1]).read())
    b.connect(b, SIGNAL('pressed()'), plot)
    mw.show()
    plot()
    a.exec_()