basicShape.py

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###############################################################################
##
## basicShape.py
##
## Description:
##    Registers a new type of shape with maya called "basicShape".
##    This shape will display rectangles, triangles, and circles using basic gl
##
##
##    There are no output attributes for this shape.
##    The following input attributes define the type of shape to draw.
##
##       shapeType  : 0=rectangle, 1=circle, 2=triangle
##       radius         : circle radius
##       height         : rectangle and triangle height
##               width          : rectangle and triangle width
##
################################################################################

# Usage:
# import maya
# maya.cmds.loadPlugin("basicShape.py")
# maya.cmds.createNode("spBasicShape")
#
# An object will be created with reference to the node.  By default it will be a rectangle.
# Use the different options node options to change the type of shape or its size and shape.
# Add textures or manipulate as with any other object.
#

import maya.OpenMaya as OpenMaya
import maya.OpenMayaMPx as OpenMayaMPx
import maya.OpenMayaRender as OpenMayaRender
import maya.OpenMayaUI as OpenMayaUI

import math
import sys


kPluginNodeTypeName = "spBasicShape"
spBasicShapeNodeId = OpenMaya.MTypeId(0x87018)

glRenderer = OpenMayaRender.MHardwareRenderer.theRenderer()
glFT = glRenderer.glFunctionTable()

kLeadColor                              = 18 # green
kActiveColor                    = 15 # white
kActiveAffectedColor    = 8  # purple
kDormantColor                   = 4  # blue
kHiliteColor                    = 17 # pale blue

kDefaultRadius = 1.0
kDefaultHeight = 2.0
kDefaultWidth = 2.0
kDefaultShapeType = 0


#####################################################################
##
## Geometry class
##
class basicGeom:
        radius = kDefaultRadius
        height = kDefaultHeight
        width = kDefaultWidth
        shapeType = kDefaultShapeType


#####################################################################
##
## Shape class - defines the non-UI part of a shape node
##
class basicShape(OpenMayaMPx.MPxSurfaceShape):
        def __init__(self):
                OpenMayaMPx.MPxSurfaceShape.__init__(self)

                # class variables
                aShapeType = OpenMaya.MObject()
                aRadius = OpenMaya.MObject()
                aHeight = OpenMaya.MObject()
                aWidth = OpenMaya.MObject()

                # geometry
                self.__myGeometry = basicGeom()


        # override
        def postConstructor(self):
                """
                 When instances of this node are created internally, the MObject associated
                 with the instance is not created until after the constructor of this class
                 is called. This means that no member functions of MPxSurfaceShape can
                 be called in the constructor.
                 The postConstructor solves this problem. Maya will call this function
                 after the internal object has been created.
                 As a general rule do all of your initialization in the postConstructor.
                """
                self.setRenderable(True)


        # override
        def compute(self, plug, dataBlock):
                """
                 Since there are no output attributes this is not necessary but
                 if we wanted to compute an output mesh for rendering it would
                 be done here base on the inputs.
                """
                return OpenMaya.kUnknownParameter


        # override
        def getInternalValue(self, plug, datahandle):
                """
                 Handle internal attributes.
                 In order to impose limits on our attribute values we
                 mark them internal and use the values in fGeometry intead.
                """
                if (plug == basicShape.aRadius):
                        datahandle.setDouble(self.__myGeometry.radius)

                elif (plug == basicShape.aHeight):
                        datahandle.setDouble(self.__myGeometry.height)
                
                elif (plug == basicShape.aWidth):
                        datahandle.setDouble(self.__myGeometry.width)

                else:
                        return OpenMayaMPx.MPxSurfaceShape.getInternalValue(self, plug, datahandle)

                return True


        # override
        def setInternalValue(self, plug, datahandle):
                """
                 Handle internal attributes.
                 In order to impose limits on our attribute values we
                 mark them internal and use the values in fGeometry intead.
                """

                # the minimum radius is 0
                #
                if (plug == basicShape.aRadius):
                        radius = datahandle.asDouble()
                        
                        if (radius < 0):
                                radius = 0

                        self.__myGeometry.radius = radius

                elif (plug == basicShape.aHeight):
                        val = datahandle.asDouble()
                        if (val <= 0):
                                val = 0.1
                        self.__myGeometry.height = val

                elif (plug == basicShape.aWidth):
                        val = datahandle.asDouble()
                        if (val <= 0):
                                val = 0.1
                        self.__myGeometry.width = val
                
                else:
                        return OpenMayaMPx.MPxSurfaceShape.setInternalValue(plug, datahandle)
                
                return True


        # override
        def isBounded(self):
                return True


        # override
        def boundingBox(self):
                """
                 Returns the bounding box for the shape.
                 In this case just use the radius and height attributes
                 to determine the bounding box.
                """
                result = OpenMaya.MBoundingBox()

                geom = self.geometry()

                r = geom.radius
                result.expand(OpenMaya.MPoint(r,r,r))
                result.expand(OpenMaya.MPoint(-r,-r,-r))
                
                r = geom.height/2.0
                result.expand(OpenMaya.MPoint(r,r,r))
                result.expand(OpenMaya.MPoint(-r,-r,-r))
                
                r = geom.width/2.0
                result.expand(OpenMaya.MPoint(r,r,r))
                result.expand(OpenMaya.MPoint(-r,-r,-r))

                return result


        def geometry(self):
                """
                 This function gets the values of all the attributes and
                 assigns them to the fGeometry. Calling MPlug::getValue
                 will ensure that the values are up-to-date.
                """
                # return self.__myGeometry

                this_object = self.thisMObject()

                plug = OpenMaya.MPlug(this_object, basicShape.aRadius)
                self.__myGeometry.radius = plug.asDouble()

                plug.setAttribute(basicShape.aHeight)
                self.__myGeometry.height = plug.asDouble()
                
                plug.setAttribute(basicShape.aWidth)
                self.__myGeometry.width = plug.asDouble()
                
                plug.setAttribute(basicShape.aShapeType)
                self.__myGeometry.shapeType = plug.asShort() # enum????

                return self.__myGeometry

def printMsg(msg):
        print msg
        stream=OpenMaya.MStreamUtils.stdOutStream()
        OpenMaya.MStreamUtils.writeCharBuffer(stream,msg)

#####################################################################
##
## UI class     - defines the UI part of a shape node
##
class basicShapeUI(OpenMayaMPx.MPxSurfaceShapeUI):
        # private enums
        __kDrawRectangle, __kDrawCircle, __kDrawTriangle = range(3)
        __kDrawWireframe, __kDrawWireframeOnShaded, __kDrawSmoothShaded, __kDrawFlatShaded, __kLastToken = range(5)

        def __init__(self):
                OpenMayaMPx.MPxSurfaceShapeUI.__init__(self)


        # override
        def getDrawRequests(self, info, objectAndActiveOnly, queue):
                """
                 The draw data is used to pass geometry through the 
                 draw queue. The data should hold all the information
                 needed to draw the shape.
                """
                data = OpenMayaUI.MDrawData()
                # printMsg("**before getProtoype\n");
                request = info.getPrototype(self)
                # printMsg("**after getProtoype\n");
                shapeNode = self.surfaceShape()
                geom = shapeNode.geometry()
                self.getDrawData(geom, data)
                request.setDrawData(data)

                # Are we displaying meshes?
                if (not info.objectDisplayStatus(OpenMayaUI.M3dView.kDisplayMeshes)):
                        return

                # Use display status to determine what color to draw the object
                if (info.displayStyle() == OpenMayaUI.M3dView.kWireFrame):
                        self.getDrawRequestsWireframe(request, info)
                        queue.add(request)

                elif (info.displayStyle() == OpenMayaUI.M3dView.kGouraudShaded):
                        request.setToken(basicShapeUI.__kDrawSmoothShaded)
                        self.getDrawRequestsShaded(request, info, queue, data)
                        queue.add(request)

                elif (info.displayStyle() == OpenMayaUI.M3dView.kFlatShaded):
                        request.setToken(basicShapeUI.__kDrawFlatShaded)
                        self.getDrawRequestsShaded(request, info, queue, data)
                        queue.add(request)
                return 


        # override
        def draw(self, request, view):
                """
                 From the given draw request, get the draw data and determine
                 which basic to draw and with what values.
                """
                
                data = request.drawData()
                shapeNode = self.surfaceShape()
                geom = shapeNode.geometry()
                token = request.token()
                drawTexture = False

                su = OpenMaya.MScriptUtil()
                su.createFromDouble(1.0,1.0,1.0,1.0)

                #set up texturing if it is shaded
                if ((token == basicShapeUI.__kDrawSmoothShaded) or
                                        (token == basicShapeUI.__kDrawFlatShaded)):
                        # Set up the material
                        material = request.material()
                        material.setMaterial(request.multiPath(), request.isTransparent())
                                
                        # Enable texturing
                        drawTexture = material.materialIsTextured()
                        
                        # Apply the texture to the current view
                        if (drawTexture):
                                material.applyTexture(view, data)

                glFT.glPushAttrib( OpenMayaRender.MGL_ALL_ATTRIB_BITS )
                
                if ((token == basicShapeUI.__kDrawSmoothShaded) or
                                        (token == basicShapeUI.__kDrawFlatShaded)):                     
                        glFT.glEnable(OpenMayaRender.MGL_POLYGON_OFFSET_FILL)
                        glFT.glPolygonMode(OpenMayaRender.MGL_FRONT_AND_BACK, OpenMayaRender.MGL_FILL)
                        if (drawTexture):
                                glFT.glEnable(OpenMayaRender.MGL_TEXTURE_2D)                    
                else:
                        glFT.glPolygonMode(OpenMayaRender.MGL_FRONT_AND_BACK, OpenMayaRender.MGL_LINE)
                        
                # draw the shapes
                if (geom.shapeType == basicShapeUI.__kDrawCircle):
                        # circle
                        glFT.glBegin(OpenMayaRender.MGL_POLYGON)
                        for i in range(0,360):
                                rad = (i*2*math.pi)/360;
                                glFT.glNormal3f(0.0, 0.0, 1.0)
                                if (i == 360):
                                        glFT.glTexCoord3f(geom.radius*math.cos(0), geom.radius*math.sin(0), 0.0)
                                        glFT.glVertex3f(geom.radius*math.cos(0), geom.radius*math.sin(0), 0.0)
                                else:
                                        glFT.glTexCoord3f(geom.radius*math.cos(rad), geom.radius*math.sin(rad), 0.0)
                                        glFT.glVertex3f(geom.radius*math.cos(rad), geom.radius*math.sin(rad), 0.0)
                        glFT.glEnd()

                elif (geom.shapeType == basicShapeUI.__kDrawRectangle):
                        #rectangle
                        glFT.glBegin(OpenMayaRender.MGL_QUADS)

                        glFT.glTexCoord2f(-1*(geom.width/2), -1*(geom.height/2))
                        glFT.glVertex3f(-1*(geom.width/2), -1*(geom.height/2), 0.0)
                        glFT.glNormal3f(0, 0, 1.0)
                        
                        glFT.glTexCoord2f(-1*(geom.width/2), (geom.height/2))
                        glFT.glVertex3f(-1*(geom.width/2), (geom.height/2), 0.0)
                        glFT.glNormal3f(0, 0, 1.0)
                        
                        glFT.glTexCoord2f((geom.width/2), (geom.height/2))
                        glFT.glVertex3f((geom.width/2), (geom.height/2), 0.0)
                        glFT.glNormal3f(0, 0, 1.0)
                        
                        glFT.glTexCoord2f((geom.width/2), -1*(geom.height/2))
                        glFT.glVertex3f((geom.width/2), -1*(geom.height/2), 0.0)
                        glFT.glNormal3f(0, 0, 1.0)
                        glFT.glEnd()
                
                else:
                        # triangle
                        glFT.glBegin(OpenMayaRender.MGL_TRIANGLES)
                        glFT.glTexCoord2f(-1*(geom.width/2), -1*(geom.height/2))
                        glFT.glVertex3f(-1*(geom.width/2), -1*(geom.height/2), 0.0)
                        glFT.glNormal3f(0.0, 0.0, 1.0)
                        
                        glFT.glTexCoord2f(0.0, (geom.height/2))
                        glFT.glVertex3f(0.0, (geom.height/2), 0.0)
                        glFT.glNormal3f(0.0, 0.0, 1.0)
                        
                        glFT.glTexCoord2f((geom.width/2), -1*(geom.height/2))
                        glFT.glVertex3f((geom.width/2), -1*(geom.height/2), 0.0)
                        glFT.glNormal3f(0.0, 0.0, 1.0)
                        glFT.glEnd()
                        
                if ((token == basicShapeUI.__kDrawSmoothShaded) or
                                        (token == basicShapeUI.__kDrawFlatShaded)):
                        glFT.glDisable(OpenMayaRender.MGL_POLYGON_OFFSET_FILL)
                        # Turn off texture mode
                        if (drawTexture):
                                glFT.glDisable(OpenMayaRender.MGL_TEXTURE_2D)
                
                glFT.glPopAttrib()



        # override
        def select(self, selectInfo, selectionList, worldSpaceSelectPts):
                """
                 Select function. Gets called when the bbox for the object is selected.
                 This function just selects the object without doing any intersection tests.
                """
                
                priorityMask = OpenMaya.MSelectionMask(OpenMaya.MSelectionMask.kSelectObjectsMask)
                item = OpenMaya.MSelectionList()
                item.add(selectInfo.selectPath())
                xformedPt = OpenMaya.MPoint()
                selectInfo.addSelection(item, xformedPt, selectionList,
                                                                 worldSpaceSelectPts, priorityMask, False)
                return True


        def getDrawRequestsWireframe(self, request, info):
        
                request.setToken(basicShapeUI.__kDrawWireframe)

                displayStatus = info.displayStatus()
                activeColorTable = OpenMayaUI.M3dView.kActiveColors
                dormantColorTable = OpenMayaUI.M3dView.kDormantColors
                
                if (displayStatus == OpenMayaUI.M3dView.kLead):
                                request.setColor(kLeadColor, activeColorTable)

                elif (displayStatus == OpenMayaUI.M3dView.kActive):
                                request.setColor(kActiveColor, activeColorTable)

                elif (displayStatus == OpenMayaUI.M3dView.kActiveAffected):
                                request.setColor(kActiveAffectedColor, activeColorTable)

                elif (displayStatus == OpenMayaUI.M3dView.kDormant):
                                request.setColor(kDormantColor, dormantColorTable)

                elif (displayStatus == OpenMayaUI.M3dView.kHilite):
                                request.setColor(kHiliteColor, activeColorTable)



        def getDrawRequestsShaded(self, request, info, queue, data):
                # Need to get the material info
                path = info.multiPath() # path to your dag object 
                view = info.view()              # view to draw to
                material = OpenMayaMPx.MPxSurfaceShapeUI.material(self, path)
                displayStatus = info.displayStatus()

                # Evaluate the material and if necessary, the texture.
                if (not material.evaluateMaterial(view, path)):
                        print "Couldn't evaluate material\n"

                drawTexture = True
                if (drawTexture and material.materialIsTextured()):
                        material.evaluateTexture(data)

                request.setMaterial(material)

                #materialTransparent = False
                #material.getHasTransparency(materialTransparent)
                #if (materialTransparent):
                #       request.setIsTransparent(True)

                # create a draw request for wireframe on shaded if necessary.
                if ((displayStatus == OpenMayaUI.M3dView.kActive) or
                                 (displayStatus == OpenMayaUI.M3dView.kLead) or
                                 (displayStatus == OpenMayaUI.M3dView.kHilite)):
                        wireRequest = info.getPrototype(self)
                        wireRequest.setDrawData(data)
                        self.getDrawRequestsWireframe(wireRequest, info)
                        wireRequest.setToken(basicShapeUI.__kDrawWireframeOnShaded)
                        wireRequest.setDisplayStyle(OpenMayaUI.M3dView.kWireFrame)
                        queue.add(wireRequest)

#####################################################################

def nodeCreator():
        return OpenMayaMPx.asMPxPtr( basicShape() )


def uiCreator():
        return OpenMayaMPx.asMPxPtr( basicShapeUI() )


def nodeInitializer():
        # BASIC type enumerated attribute
        enumAttr = OpenMaya.MFnEnumAttribute()
        basicShape.aShapeType = enumAttr.create("shapeType", "st", kDefaultShapeType)
        enumAttr.addField("rectangle", 0)
        enumAttr.addField("circle", 1)
        enumAttr.addField("triangle", 2)
        enumAttr.setHidden(False)
        enumAttr.setKeyable(True)
        basicShape.addAttribute(basicShape.aShapeType)

        # BASIC numeric attributes
        # utility func for numeric attrs
        def setOptions(attr):
                attr.setHidden(False)
                attr.setKeyable(True)
                attr.setInternal(True)

        numericAttr = OpenMaya.MFnNumericAttribute()

        basicShape.aRadius = numericAttr.create("radius", "r", OpenMaya.MFnNumericData.kDouble, kDefaultRadius)
        setOptions(numericAttr)
        basicShape.addAttribute(basicShape.aRadius)

        basicShape.aHeight = numericAttr.create("height", "ht", OpenMaya.MFnNumericData.kDouble, kDefaultHeight)
        setOptions(numericAttr)
        basicShape.addAttribute(basicShape.aHeight)
        
        basicShape.aWidth = numericAttr.create("width2", "wt2", OpenMaya.MFnNumericData.kDouble, kDefaultWidth)
        setOptions(numericAttr)
        basicShape.addAttribute(basicShape.aWidth)

# initialize the script plug-in
def initializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject, "Autodesk", "8.5", "Any")
        try:
                mplugin.registerShape( kPluginNodeTypeName, spBasicShapeNodeId,
                                                                nodeCreator, nodeInitializer, uiCreator )
        except:
                sys.stderr.write( "Failed to register node: %s" % kPluginNodeTypeName )
                raise


# uninitialize the script plug-in
def uninitializePlugin(mobject):
        mplugin = OpenMayaMPx.MFnPlugin(mobject)
        try:
                mplugin.deregisterNode( spBasicShapeNodeId )
        except:
                sys.stderr.write( "Failed to deregister node: %s" % kPluginNodeTypeName )
                raise