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@@ -33,6 +33,7 @@ |
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import ftools_utils |
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from qgis.core import * |
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from ui_frmVectorGrid import Ui_Dialog |
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import math |
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class Dialog(QDialog, Ui_Dialog): |
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def __init__(self, iface): |
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@@ -44,6 +45,7 @@ def __init__(self, iface): |
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#QObject.connect(self.inShape, SIGNAL("currentIndexChanged(QString)"), self.updateInput) |
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QObject.connect(self.btnUpdate, SIGNAL("clicked()"), self.updateLayer) |
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QObject.connect(self.btnCanvas, SIGNAL("clicked()"), self.updateCanvas) |
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QObject.connect(self.chkAlign, SIGNAL("toggled(bool)"), self.chkAlignToggled) |
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self.buttonOk = self.buttonBox_2.button( QDialogButtonBox.Ok ) |
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self.setWindowTitle(self.tr("Vector grid")) |
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self.xMin.setValidator(QDoubleValidator(self.xMin)) |
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@@ -66,12 +68,50 @@ def updateLayer( self ): |
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mLayerName = self.inShape.currentText() |
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if not mLayerName == "": |
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mLayer = ftools_utils.getMapLayerByName( unicode( mLayerName ) ) |
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# get layer extents |
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boundBox = mLayer.extent() |
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# if "align extents and resolution..." button is checked |
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if self.chkAlign.isChecked(): |
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if not mLayer.type() == QgsMapLayer.RasterLayer: |
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QMessageBox.information(self, self.tr("Vector grid"), self.tr("Please select a raster layer")) |
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else: |
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dx = math.fabs(boundBox.xMaximum()-boundBox.xMinimum()) / mLayer.width() |
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dy = math.fabs(boundBox.yMaximum()-boundBox.yMinimum()) / mLayer.height() |
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self.spnX.setValue(dx) |
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self.spnY.setValue(dy) |
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self.updateExtents( boundBox ) |
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def updateCanvas( self ): |
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canvas = self.iface.mapCanvas() |
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boundBox = canvas.extent() |
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# if "align extents and resolution..." button is checked |
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if self.chkAlign.isChecked(): |
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mLayerName = self.inShape.currentText() |
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if not mLayerName == "": |
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mLayer = ftools_utils.getMapLayerByName( unicode( mLayerName ) ) |
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if not mLayer.type() == QgsMapLayer.RasterLayer: |
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QMessageBox.information(self, self.tr("Vector grid"), self.tr("Please select a raster layer")) |
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else: |
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# get extents and pixel size |
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xMin = boundBox.xMinimum() |
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yMin = boundBox.yMinimum() |
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xMax = boundBox.xMaximum() |
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yMax = boundBox.yMaximum() |
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boundBox2 = mLayer.extent() |
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dx = math.fabs(boundBox2.xMaximum()-boundBox2.xMinimum()) / mLayer.width() |
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dy = math.fabs(boundBox2.yMaximum()-boundBox2.yMinimum()) / mLayer.height() |
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# get pixels from the raster that are closest to the desired extent |
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newXMin = self.getClosestPixel( boundBox2.xMinimum(), boundBox.xMinimum(), dx, True ) |
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newXMax = self.getClosestPixel( boundBox2.xMaximum(), boundBox.xMaximum(), dx, False ) |
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newYMin = self.getClosestPixel( boundBox2.yMinimum(), boundBox.yMinimum(), dy, True ) |
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newYMax = self.getClosestPixel( boundBox2.yMaximum(), boundBox.yMaximum(), dy, False ) |
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# apply new values if found all min/max |
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if newXMin is not None and newXMax is not None and newYMin is not None and newYMax is not None: |
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boundBox.set( newXMin, newYMin, newXMax, newYMax ) |
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self.spnX.setValue(dx) |
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self.spnY.setValue(dy) |
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else: |
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QMessageBox.information(self, self.tr("Vector grid"), self.tr("Unable to compute extents aligned on selected raster layer")) |
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self.updateExtents( boundBox ) |
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def updateExtents( self, boundBox ): |
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@@ -185,3 +225,39 @@ def outFile(self): |
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if self.shapefileName is None or self.encoding is None: |
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return |
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self.outShape.setText( QString( self.shapefileName ) ) |
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def chkAlignToggled(self): |
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if self.chkAlign.isChecked(): |
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self.spnX.setEnabled( False ) |
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self.lblX.setEnabled( False ) |
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self.spnY.setEnabled( False ) |
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self.lblY.setEnabled( False ) |
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else: |
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self.spnX.setEnabled( True ) |
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self.lblX.setEnabled( True ) |
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self.spnY.setEnabled( not self.chkLock.isChecked() ) |
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self.lblY.setEnabled( not self.chkLock.isChecked() ) |
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def getClosestPixel(self, startVal, targetVal, step, isMin ): |
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foundVal = None |
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tmpVal = startVal |
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# find pixels covering the extent - slighlyt inneficient b/c loop on all elements before xMin |
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if targetVal < startVal: |
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backOneStep = not isMin |
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step = - step |
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while foundVal is None: |
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if tmpVal <= targetVal: |
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if backOneStep: |
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tmpVal -= step |
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foundVal = tmpVal |
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tmpVal += step |
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else: |
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backOneStep = isMin |
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while foundVal is None: |
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if tmpVal >= targetVal: |
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if backOneStep: |
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tmpVal -= step |
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foundVal = tmpVal |
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tmpVal += step |
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return foundVal |
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