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font size should now scale based on display size #247

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Merged
rlizzo merged 1 commit into from
Mar 2, 2018
Merged

font size should now scale based on display size #247

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42 changes: 40 additions & 2 deletions vmtkScripts/vmtkrenderer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
import vtk
import sys
import os
import math

from vmtk import pypes
from vmtk import vtkvmtk
Expand Down Expand Up @@ -97,6 +98,41 @@ def __init__(self):
self.SetOutputMembers([
['vmtkRenderer','o','vmtkRenderer',1,'','the renderer']])

def _GetScreenFontSize(self):
'''Returns an integer representing font size appropriatly scaled for the users screen resolution

This function is designed to be called from the self.Initialize() method. It creates a temporary render window
and returns an intiger for which the text font size should be set to, given the user's current screen resolution.
Minimum output size is set to 8, maximum to 50, for readability purposes.

Arguments:
Input:
- None (no positional or keyword arguments)

Output:
- fontSize (int): font size appropriatly scaled for the users screen
'''
tempRenderWindow = vtk.vtkRenderWindow()
userScreenWidth, userScreenHeight = tempRenderWindow.GetScreenSize()

baseScreenWidth = 3360 # Number of pixels across the width of the calibration monitor
baseScreenHeight = 2100 # Number of pixels across the heigh of the calibration monitor
baseFontSize = 24 # Font size appropriate for the calibration monitor of size baseScreenWidth x baseScreenHeight

baseFontScalePerPixelWidth = math.floor(baseScreenWidth / baseFontSize)

scaledFontSize = math.ceil(userScreenWidth / baseFontScalePerPixelWidth)

# make sure that the font size won't be set too low or high for low/high screen resolutions.
if scaledFontSize < 8:
scaledFontSize = 8

if scaledFontSize > 50:
scaledFontSize = 50

return scaledFontSize


def ResetCameraCallback(self,obj):
self.Renderer.ResetCamera()

Expand Down Expand Up @@ -294,8 +330,10 @@ def Initialize(self):
#self.TextActorStd.SetPosition(self.PositionStd)
#self.Renderer.AddActor(self.TextActorStd)

fontSize = self._GetScreenFontSize()

self.TextActor = vtk.vtkTextActor()
self.TextActor.GetTextProperty().SetFontSize(24)
self.TextActor.GetTextProperty().SetFontSize(fontSize)
self.TextActor.GetPositionCoordinate().SetCoordinateSystemToNormalizedViewport()
self.TextActor.GetPosition2Coordinate().SetCoordinateSystemToNormalizedViewport()
self.TextActor.SetPosition(self.Position)
Expand All @@ -306,7 +344,7 @@ def Initialize(self):
#self.Renderer.AddActor(self.TextActorOpmode)

self.TextInputActor = vtk.vtkTextActor()
self.TextInputActor.GetTextProperty().SetFontSize(24)
self.TextInputActor.GetTextProperty().SetFontSize(fontSize)
self.TextInputActor.GetPositionCoordinate().SetCoordinateSystemToNormalizedViewport()
self.TextInputActor.GetPosition2Coordinate().SetCoordinateSystemToNormalizedViewport()
self.TextInputActor.SetPosition(self.InputPosition)
Expand Down