Fixed GLLinePlotItem line width option

Added antialiasing to GL line items

examples/GLLinePlotItem.py

@@ -40,7 +40,7 @@ for i in range(n):
     d = (x**2 + yi**2)**0.5
     z = 10 * np.cos(d) / (d+1)
     pts = np.vstack([x,yi,z]).transpose()
-    plt = gl.GLLinePlotItem(pos=pts, color=pg.glColor((i,n*1.3)))
+    plt = gl.GLLinePlotItem(pos=pts, color=pg.glColor((i,n*1.3)), width=(i+1)/10., antialias=True)
     w.addItem(plt)
     
 

pyqtgraph/opengl/items/GLAxisItem.py

@@ -12,10 +12,11 @@ class GLAxisItem(GLGraphicsItem):
     
     """
     
-    def __init__(self, size=None):
+    def __init__(self, size=None, antialias=True):
         GLGraphicsItem.__init__(self)
         if size is None:
             size = QtGui.QVector3D(1,1,1)
+        self.antialias = antialias
         self.setSize(size=size)
     
     def setSize(self, x=None, y=None, z=None, size=None):
@@ -39,8 +40,11 @@ class GLAxisItem(GLGraphicsItem):
         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
         glEnable( GL_BLEND )
         glEnable( GL_ALPHA_TEST )
-        glEnable( GL_POINT_SMOOTH )
-        #glDisable( GL_DEPTH_TEST )
+        
+        if self.antialias:
+            glEnable(GL_LINE_SMOOTH)
+            glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
+            
         glBegin( GL_LINES )
         
         x,y,z = self.size()

pyqtgraph/opengl/items/GLGridItem.py

@@ -11,9 +11,10 @@ class GLGridItem(GLGraphicsItem):
     Displays a wire-grame grid. 
     """
     
-    def __init__(self, size=None, color=None, glOptions='translucent'):
+    def __init__(self, size=None, color=None, antialias=True, glOptions='translucent'):
         GLGraphicsItem.__init__(self)
         self.setGLOptions(glOptions)
+        self.antialias = antialias
         if size is None:
             size = QtGui.QVector3D(1,1,1)
         self.setSize(size=size)
@@ -36,11 +37,13 @@ class GLGridItem(GLGraphicsItem):
     
     def paint(self):
         self.setupGLState()
-        #glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
-        #glEnable( GL_BLEND )
-        #glEnable( GL_ALPHA_TEST )
-        glEnable( GL_POINT_SMOOTH )
-        #glDisable( GL_DEPTH_TEST )
+        
+        if self.antialias:
+            glEnable(GL_LINE_SMOOTH)
+            glEnable(GL_BLEND)
+            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
+            glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
+            
         glBegin( GL_LINES )
         
         x,y,z = self.size()

pyqtgraph/opengl/items/GLLinePlotItem.py

@@ -32,13 +32,14 @@ class GLLinePlotItem(GLGraphicsItem):
         color                 tuple of floats (0.0-1.0) specifying
                               a color for the entire item.
         width                 float specifying line width
+        antialias             enables smooth line drawing
         ====================  ==================================================
         """
-        args = ['pos', 'color', 'width', 'connected']
+        args = ['pos', 'color', 'width', 'connected', 'antialias']
         for k in kwds.keys():
             if k not in args:
                 raise Exception('Invalid keyword argument: %s (allowed arguments are %s)' % (k, str(args)))
-            
+        self.antialias = False
         for arg in args:
             if arg in kwds:
                 setattr(self, arg, kwds[arg])
@@ -72,8 +73,15 @@ class GLLinePlotItem(GLGraphicsItem):
         try:
             glVertexPointerf(self.pos)
             glColor4f(*self.color)
+            glLineWidth(self.width)
+            #glPointSize(self.width)
             
-            glPointSize(self.width)
+            if self.antialias:
+                glEnable(GL_LINE_SMOOTH)
+                glEnable(GL_BLEND)
+                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
+                glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
+                
             glDrawArrays(GL_LINE_STRIP, 0, self.pos.size / self.pos.shape[-1])
         finally:
             glDisableClientState(GL_VERTEX_ARRAY)