So... I went about it like this but I clearly don't understand how arcTo() works, I keep getting a leading line???
The following I get from reading a DXF file:
{'type': 'ARC', 'pos': [0, 0], 'layer': 'What', 'r': 30.0, 'start_ang': 180.0, 'end_ang': 315.0, 'v1': [30.0, 70.0, 0]}* BTW: Ignore the pos, the real centre point is v1
Whilst posting I've even just tried calculating the cos / sin offset, but no...
Anyway, here's my code if anyone can explain how drawing the afore-mentioned arc is achieved.
import sys
from PyQt5.QtCore import Qt, QRectF
from PyQt5.QtGui import QBrush, QPainter, QPen, QTransform, QPainterPath
from PyQt5.QtWidgets import (
QApplication,
QMainWindow,
QWidget,
QGraphicsScene,
QGraphicsView,
QHBoxLayout,
QVBoxLayout,
QPushButton,
QGraphicsItem,
QGraphicsLineItem,
QGraphicsPathItem
)
class Win(QMainWindow):
view_scales = [0.2, 0.4, 0.6, 0.8, 1.0, 1.5, 2.0, 3.0]
view_scale_current = 4
def __init__(self):
super().__init__()
# GRAPHICS SCENE & VIEW
self.scene = QGraphicsScene(0, 0, 2400, 2400)
self.view = QGraphicsView(self.scene)
self.view.setRenderHint(QPainter.Antialiasing)
# TEST TOOLBAR
toolbox = QHBoxLayout()
btn_all = QPushButton("ALL")
btn_all.clicked.connect(self.view_scale_all)
toolbox.addWidget(btn_all)
# MAIN LAYOUT
vbox = QVBoxLayout()
vbox.addWidget(self.view)
vbox.addLayout(toolbox)
# WINDOW LAYOUT
widget = QWidget()
widget.setLayout(vbox)
self.setCentralWidget(widget)
# LOAD DRAWING
self.dwg_load()
def dwg_load(self):
# TMP
#self.item_add_line({"pos":[0, 0], "v1":[10, 10], "v2":[100, 10]})
#self.item_add_line({"pos":[0, 0], "v1":[10, 20], "v2":[100, 100]})
#self.item_add_line({"pos":[150, 50], "v1":[0, 0], "v2":[100, 100]})
self.item_add_poly({"pos":[0, 0], "v":[[10,10], [50, 80], [60, 80], [60, 100], [80, 120]]})
self.item_add_arc({'type': 'ARC', 'pos': [0, 0], 'layer': 'What', 'r': 30.0, 'start_ang': 180.0, 'end_ang': 315.0, 'v1': [30.0, 70.0, 0]})
def item_add_arc(self, data):
path = QPainterPath()
#path.moveTo(pline[0][0], pline[0][1])
#path.moveTo(data["v1"][0], data["v1"][1])
path.moveTo(data["v1"][0]-data["r"], data["v1"][1]-data["r"])
#QPainterPath::arcTo(qreal x, qreal y, qreal width, qreal height, qreal startAngle, qreal sweepLength)
#path.arcTo(data["v1"][0], data["v1"][1], data["r"], data["r"], data["start_ang"], data["end_ang"]-data["start_ang"])
path.arcTo(data["v1"][0], data["v1"][1], data["r"]*2, data["r"]*2, data["start_ang"], data["start_ang"]-data["end_ang"])
o = QGraphicsPathItem(path)
o.setPos(data["pos"][0], data["pos"][1])
# OUTLINE
pen = QPen(Qt.red)
pen.setWidth(1)
o.setPen(pen)
# SET DATA
o.setData(0, data)
# PROPERTIES
o.setFlag(QGraphicsItem.ItemIsMovable)
o.setFlag(QGraphicsItem.ItemIsSelectable)
# ADD
self.scene.addItem(o)
def item_add_poly(self, data):
path = QPainterPath()
pline = data["v"]
path.moveTo(pline[0][0], pline[0][1])
for i in range(1, len(pline)):
path.lineTo(pline[i][0], pline[i][1])
o = QGraphicsPathItem(path)
o.setPos(data["pos"][0], data["pos"][1])
# OUTLINE
pen = QPen(Qt.red)
pen.setWidth(1)
o.setPen(pen)
# SET DATA
o.setData(0, data)
# PROPERTIES
o.setFlag(QGraphicsItem.ItemIsMovable)
o.setFlag(QGraphicsItem.ItemIsSelectable)
# ADD
self.scene.addItem(o)
def item_add_line(self, data):
# Draw a rectangle item, setting the dimensions.
o = QGraphicsLineItem() #0, 0, 200, 50)
o.setPos(data["pos"][0], data["pos"][1])
o.setLine(data["v1"][0], data["v1"][1], data["v2"][0], data["v2"][1])
# OUTLINE
pen = QPen(Qt.red)
pen.setWidth(1)
o.setPen(pen)
# SET DATA
o.setData(0, data)
# PROPERTIES
o.setFlag(QGraphicsItem.ItemIsMovable)
o.setFlag(QGraphicsItem.ItemIsSelectable)
# ADD
self.scene.addItem(o)
def view_scale_all(self):
print("ZOOM ALL")
items = self.scene.items()
# CALC BOUNDS
min_x = sys.float_info.max
max_x = sys.float_info.min
min_y = sys.float_info.max
max_y = sys.float_info.min
#i = 0
for item in items:
d = item.data(0)
if d != None:
br = item.sceneBoundingRect()
#br = item.childrenBoundingRect()
br.translate(item.pos())
# TOP LEFT
if br.left() < min_x:
min_x = br.left()
if br.top() < min_y:
min_y = br.top()
# BOTTOM RIGHT
if br.right() > max_x:
max_x = br.right()
if br.bottom() > max_y:
max_y = br.bottom()
max_x -= min_x
max_y -= min_y
self.view.fitInView(QRectF(min_x, min_y, max_x, max_y), Qt.KeepAspectRatio)
self.view.repaint()
if __name__ == '__main__':
app = QApplication(sys.argv)
w = Win()
w.show()
sys.exit(app.exec_())Thanks
