Mercurial Repositories > eric / file comparison
comparison: E5Graphics/E5GraphicsView.py
E5Graphics/E5GraphicsView.py
- changeset 2334
- fc69ad77e18a
- parent 2302
- f29e9405c851
- child 2525
- 8b507a9a2d40
- child 2953
- 703452a2876f
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| 2331:9e623311630d | 2334:fc69ad77e18a |
|---|---|
| 7 Module implementing a canvas view class. | 7 Module implementing a canvas view class. |
| 8 """ | 8 """ |
| 9 | 9 |
| 10 import sys | 10 import sys |
| 11 | 11 |
| 12 from PyQt4.QtCore import QRectF, QSize, QSizeF, Qt | 12 from PyQt4.QtCore import pyqtSignal, QRectF, QSize, QSizeF, Qt |
| 13 from PyQt4.QtGui import QGraphicsView, QBrush, QPainter, QPixmap, QFont, QColor | 13 from PyQt4.QtGui import QGraphicsView, QBrush, QPainter, QPixmap, QFont, QColor |
| 14 | 14 |
| 15 import Preferences | 15 import Preferences |
| 16 | 16 |
| 17 | 17 |
| 18 class E5GraphicsView(QGraphicsView): | 18 class E5GraphicsView(QGraphicsView): |
| 19 """ | 19 """ |
| 20 Class implementing a graphics view. | 20 Class implementing a graphics view. |
| 21 | |
| 22 @signal zoomValueChanged(int) emitted to signal a change of the zoom value | |
| 21 """ | 23 """ |
| 24 zoomValueChanged = pyqtSignal(int) | |
| 25 | |
| 26 ZoomLevels = [ | |
| 27 1, 3, 5, 7, 9, | |
| 28 10, 20, 30, 50, 67, 80, 90, | |
| 29 100, | |
| 30 110, 120, 133, 150, 170, 200, 240, 300, 400, | |
| 31 500, 600, 700, 800, 900, 1000, | |
| 32 ] | |
| 33 ZoomLevelDefault = 100 | |
| 34 | |
| 22 def __init__(self, scene, parent=None): | 35 def __init__(self, scene, parent=None): |
| 23 """ | 36 """ |
| 24 Constructor | 37 Constructor |
| 25 | 38 |
| 26 @param scene reference to the scene object (QGraphicsScene) | 39 @param scene reference to the scene object (QGraphicsScene) |
| 52 "<li>Dragging the mouse over a selected item moves the \n" | 65 "<li>Dragging the mouse over a selected item moves the \n" |
| 53 "whole selection.</li>\n" | 66 "whole selection.</li>\n" |
| 54 "</ul>\n" | 67 "</ul>\n" |
| 55 )) | 68 )) |
| 56 | 69 |
| 70 def __levelForZoom(self, zoom): | |
| 71 """ | |
| 72 Private method determining the zoom level index given a zoom factor. | |
| 73 | |
| 74 @param zoom zoom factor (integer) | |
| 75 @return index of zoom factor (integer) | |
| 76 """ | |
| 77 try: | |
| 78 index = E5GraphicsView.ZoomLevels.index(zoom) | |
| 79 except ValueError: | |
| 80 for index in range(len(E5GraphicsView.ZoomLevels)): | |
| 81 if zoom <= E5GraphicsView.ZoomLevels[index]: | |
| 82 break | |
| 83 return index | |
| 84 | |
| 57 def zoomIn(self): | 85 def zoomIn(self): |
| 58 """ | 86 """ |
| 59 Public method to zoom in. | 87 Public method to zoom in. |
| 60 """ | 88 """ |
| 61 self.scale(1.25, 1.25) | 89 index = self.__levelForZoom(self.zoom()) |
| 90 if index < len(E5GraphicsView.ZoomLevels) - 1: | |
| 91 self.setZoom(E5GraphicsView.ZoomLevels[index + 1]) | |
| 62 | 92 |
| 63 def zoomOut(self): | 93 def zoomOut(self): |
| 64 """ | 94 """ |
| 65 Public method to zoom out. | 95 Public method to zoom out. |
| 66 """ | 96 """ |
| 67 self.scale(0.8, 0.8) | 97 index = self.__levelForZoom(self.zoom()) |
| 98 if index > 0: | |
| 99 self.setZoom(E5GraphicsView.ZoomLevels[index - 1]) | |
| 68 | 100 |
| 69 def zoomReset(self): | 101 def zoomReset(self): |
| 70 """ | 102 """ |
| 71 Public method to handle the reset zoom context menu entry. | 103 Public method to handle the reset the zoom value. |
| 72 """ | 104 """ |
| 73 self.resetMatrix() | 105 self.setZoom(E5GraphicsView.ZoomLevels[E5GraphicsView.ZoomLevelDefault]) |
| 74 | 106 |
| 75 def setZoom(self, zoomFactor): | 107 def setZoom(self, value): |
| 76 """ | 108 """ |
| 77 Public method to set the zoom factor. | 109 Public method to set the zoom value in percent. |
| 78 | 110 |
| 79 @param zoomFactor new zoom factor (float) | 111 @param value zoom value in percent (integer) |
| 80 """ | 112 """ |
| 81 self.zoomReset() | 113 if value != self.zoom(): |
| 82 self.scale(zoomFactor, zoomFactor) | 114 self.resetMatrix() |
| 115 factor = value / 100.0 | |
| 116 self.scale(factor, factor) | |
| 117 self.zoomValueChanged.emit(value) | |
| 83 | 118 |
| 84 def zoom(self): | 119 def zoom(self): |
| 85 """ | 120 """ |
| 86 Public method to get the current zoom factor. | 121 Public method to get the current zoom factor in percent. |
| 87 | 122 |
| 88 @return current zoom factor (float) | 123 @return current zoom factor in percent (integer) |
| 89 """ | 124 """ |
| 90 return self.matrix().m11() | 125 return int(self.matrix().m11() * 100.0) |
| 91 | 126 |
| 92 def resizeScene(self, amount, isWidth=True): | 127 def resizeScene(self, amount, isWidth=True): |
| 93 """ | 128 """ |
| 94 Public method to resize the scene. | 129 Public method to resize the scene. |
| 95 | 130 |
| 221 else: | 256 else: |
| 222 from PyQt4.QtSvg import QSvgGenerator | 257 from PyQt4.QtSvg import QSvgGenerator |
| 223 paintDevice = QSvgGenerator() | 258 paintDevice = QSvgGenerator() |
| 224 paintDevice.setResolution(100) # 100 dpi | 259 paintDevice.setResolution(100) # 100 dpi |
| 225 paintDevice.setSize(QSize(int(rect.width()), int(rect.height()))) | 260 paintDevice.setSize(QSize(int(rect.width()), int(rect.height()))) |
| 261 paintDevice.setViewBox(rect) | |
| 226 paintDevice.setFileName(filename) | 262 paintDevice.setFileName(filename) |
| 227 painter = QPainter(paintDevice) | 263 painter = QPainter(paintDevice) |
| 228 painter.setRenderHint(QPainter.Antialiasing, True) | 264 painter.setRenderHint(QPainter.Antialiasing, True) |
| 229 self.scene().render(painter, QRectF(), rect) | 265 self.scene().render(painter, QRectF(), rect) |
| 230 | 266 |
