218 lines
8.1 KiB
Python
218 lines
8.1 KiB
Python
from math import atan2, degrees
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from ..Qt import QtCore, QtGui
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from ..Point import Point
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from .. import functions as fn
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from .GraphicsObject import GraphicsObject
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__all__ = ['TextItem']
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class TextItem(GraphicsObject):
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"""
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GraphicsItem displaying unscaled text (the text will always appear normal even inside a scaled ViewBox).
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"""
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def __init__(self, text='', color=(200,200,200), html=None, anchor=(0,0),
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border=None, fill=None, angle=0, rotateAxis=None):
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"""
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============== =================================================================================
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**Arguments:**
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*text* The text to display
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*color* The color of the text (any format accepted by pg.mkColor)
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*html* If specified, this overrides both *text* and *color*
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*anchor* A QPointF or (x,y) sequence indicating what region of the text box will
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be anchored to the item's position. A value of (0,0) sets the upper-left corner
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of the text box to be at the position specified by setPos(), while a value of (1,1)
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sets the lower-right corner.
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*border* A pen to use when drawing the border
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*fill* A brush to use when filling within the border
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*angle* Angle in degrees to rotate text. Default is 0; text will be displayed upright.
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*rotateAxis* If None, then a text angle of 0 always points along the +x axis of the scene.
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If a QPointF or (x,y) sequence is given, then it represents a vector direction
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in the parent's coordinate system that the 0-degree line will be aligned to. This
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Allows text to follow both the position and orientation of its parent while still
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discarding any scale and shear factors.
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============== =================================================================================
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The effects of the `rotateAxis` and `angle` arguments are added independently. So for example:
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* rotateAxis=None, angle=0 -> normal horizontal text
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* rotateAxis=None, angle=90 -> normal vertical text
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* rotateAxis=(1, 0), angle=0 -> text aligned with x axis of its parent
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* rotateAxis=(0, 1), angle=0 -> text aligned with y axis of its parent
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* rotateAxis=(1, 0), angle=90 -> text orthogonal to x axis of its parent
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"""
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self.anchor = Point(anchor)
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self.rotateAxis = None if rotateAxis is None else Point(rotateAxis)
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#self.angle = 0
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GraphicsObject.__init__(self)
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self.textItem = QtGui.QGraphicsTextItem()
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self.textItem.setParentItem(self)
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self._lastTransform = None
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self._lastScene = None
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self._bounds = QtCore.QRectF()
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if html is None:
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self.setColor(color)
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self.setText(text)
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else:
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self.setHtml(html)
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self.fill = fn.mkBrush(fill)
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self.border = fn.mkPen(border)
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self.setAngle(angle)
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def setText(self, text, color=None):
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"""
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Set the text of this item.
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This method sets the plain text of the item; see also setHtml().
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"""
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if color is not None:
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self.setColor(color)
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self.setPlainText(text)
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def setPlainText(self, text):
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"""
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Set the plain text to be rendered by this item.
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See QtGui.QGraphicsTextItem.setPlainText().
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"""
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if text != self.toPlainText():
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self.textItem.setPlainText(text)
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self.updateTextPos()
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def toPlainText(self):
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return self.textItem.toPlainText()
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def setHtml(self, html):
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"""
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Set the HTML code to be rendered by this item.
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See QtGui.QGraphicsTextItem.setHtml().
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"""
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if self.toHtml() != html:
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self.textItem.setHtml(html)
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self.updateTextPos()
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def toHtml(self):
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return self.textItem.toHtml()
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def setTextWidth(self, *args):
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"""
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Set the width of the text.
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If the text requires more space than the width limit, then it will be
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wrapped into multiple lines.
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See QtGui.QGraphicsTextItem.setTextWidth().
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"""
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self.textItem.setTextWidth(*args)
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self.updateTextPos()
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def setFont(self, *args):
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"""
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Set the font for this text.
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See QtGui.QGraphicsTextItem.setFont().
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"""
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self.textItem.setFont(*args)
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self.updateTextPos()
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def setAngle(self, angle):
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"""
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Set the angle of the text in degrees.
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This sets the rotation angle of the text as a whole, measured
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counter-clockwise from the x axis of the parent. Note that this rotation
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angle does not depend on horizontal/vertical scaling of the parent.
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"""
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self.angle = angle
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self.updateTransform(force=True)
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def setAnchor(self, anchor):
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self.anchor = Point(anchor)
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self.updateTextPos()
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def setColor(self, color):
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"""
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Set the color for this text.
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See QtGui.QGraphicsItem.setDefaultTextColor().
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"""
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self.color = fn.mkColor(color)
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self.textItem.setDefaultTextColor(self.color)
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def updateTextPos(self):
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# update text position to obey anchor
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r = self.textItem.boundingRect()
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tl = self.textItem.mapToParent(r.topLeft())
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br = self.textItem.mapToParent(r.bottomRight())
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offset = (br - tl) * self.anchor
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self.textItem.setPos(-offset)
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def boundingRect(self):
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return self.textItem.mapRectToParent(self.textItem.boundingRect())
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def viewTransformChanged(self):
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# called whenever view transform has changed.
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# Do this here to avoid double-updates when view changes.
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self.updateTransform()
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def paint(self, p, *args):
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# this is not ideal because it requires the transform to be updated at every draw.
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# ideally, we would have a sceneTransformChanged event to react to..
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s = self.scene()
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ls = self._lastScene
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if s is not ls:
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if ls is not None:
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ls.sigPrepareForPaint.disconnect(self.updateTransform)
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self._lastScene = s
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if s is not None:
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s.sigPrepareForPaint.connect(self.updateTransform)
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self.updateTransform()
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p.setTransform(self.sceneTransform())
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if self.border.style() != QtCore.Qt.PenStyle.NoPen or self.fill.style() != QtCore.Qt.BrushStyle.NoBrush:
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p.setPen(self.border)
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p.setBrush(self.fill)
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p.setRenderHint(p.RenderHint.Antialiasing, True)
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p.drawPolygon(self.textItem.mapToParent(self.textItem.boundingRect()))
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def setVisible(self, v):
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GraphicsObject.setVisible(self, v)
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if v:
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self.updateTransform()
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def updateTransform(self, force=False):
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if not self.isVisible():
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return
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# update transform such that this item has the correct orientation
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# and scaling relative to the scene, but inherits its position from its
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# parent.
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# This is similar to setting ItemIgnoresTransformations = True, but
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# does not break mouse interaction and collision detection.
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p = self.parentItem()
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if p is None:
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pt = QtGui.QTransform()
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else:
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pt = p.sceneTransform()
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if not force and pt == self._lastTransform:
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return
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t = pt.inverted()[0]
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# reset translation
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t.setMatrix(t.m11(), t.m12(), t.m13(), t.m21(), t.m22(), t.m23(), 0, 0, t.m33())
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# apply rotation
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angle = -self.angle
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if self.rotateAxis is not None:
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d = pt.map(self.rotateAxis) - pt.map(Point(0, 0))
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a = degrees(atan2(d.y(), d.x()))
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angle += a
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t.rotate(angle)
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self.setTransform(t)
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self._lastTransform = pt
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self.updateTextPos()
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