sp-mesh-array.h File Reference

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Classes
class	SPMeshNode
class	SPMeshPatchI
class	SPMeshNodeArray

Enumerations
enum	SPMeshType { SP_MESH_TYPE_COONS , SP_MESH_TYPE_BICUBIC }
	A group of classes and functions for manipulating mesh gradients. More...
enum	SPMeshGeometry { SP_MESH_GEOMETRY_NORMAL , SP_MESH_GEOMETRY_CONICAL }
enum	NodeType { MG_NODE_TYPE_UNKNOWN , MG_NODE_TYPE_CORNER , MG_NODE_TYPE_HANDLE , MG_NODE_TYPE_TENSOR }
enum	NodeEdge {   MG_NODE_EDGE_NONE , MG_NODE_EDGE_TOP = 1 , MG_NODE_EDGE_LEFT = 2 , MG_NODE_EDGE_BOTTOM = 4 ,   MG_NODE_EDGE_RIGHT = 8 }
enum	MeshCornerOperation {   MG_CORNER_SIDE_TOGGLE , MG_CORNER_SIDE_ARC , MG_CORNER_TENSOR_TOGGLE , MG_CORNER_COLOR_SMOOTH ,   MG_CORNER_COLOR_PICK , MG_CORNER_INSERT }
enum	MeshNodeOperation { MG_NODE_NO_SCALE , MG_NODE_SCALE , MG_NODE_SCALE_HANDLE }

Enumeration Type Documentation

MeshCornerOperation

enum MeshCornerOperation

Enumerator
MG_CORNER_SIDE_TOGGLE
MG_CORNER_SIDE_ARC
MG_CORNER_TENSOR_TOGGLE
MG_CORNER_COLOR_SMOOTH
MG_CORNER_COLOR_PICK
MG_CORNER_INSERT

Definition at line 78 of file sp-mesh-array.h.

MeshNodeOperation

enum MeshNodeOperation

Enumerator
MG_NODE_NO_SCALE
MG_NODE_SCALE
MG_NODE_SCALE_HANDLE

Definition at line 87 of file sp-mesh-array.h.

NodeEdge

enum NodeEdge

Enumerator
MG_NODE_EDGE_NONE
MG_NODE_EDGE_TOP
MG_NODE_EDGE_LEFT
MG_NODE_EDGE_BOTTOM
MG_NODE_EDGE_RIGHT

Definition at line 70 of file sp-mesh-array.h.

NodeType

enum NodeType

Enumerator
MG_NODE_TYPE_UNKNOWN
MG_NODE_TYPE_CORNER
MG_NODE_TYPE_HANDLE
MG_NODE_TYPE_TENSOR

Definition at line 62 of file sp-mesh-array.h.

SPMeshGeometry

enum SPMeshGeometry

Enumerator
SP_MESH_GEOMETRY_NORMAL
SP_MESH_GEOMETRY_CONICAL

Definition at line 57 of file sp-mesh-array.h.

SPMeshType

enum SPMeshType

A group of classes and functions for manipulating mesh gradients.

A mesh is made up of an array of patches. Each patch has four sides and four corners. The sides can be shared between two patches and the corners between up to four.

The order of the points for each side always goes from left to right or top to bottom. For sides 2 and 3 the points must be reversed when used (as in calls to cairo functions).

Two patches: (C=corner, S=side, H=handle, T=tensor)

                  C0   H1  H2 C1 C0 H1  H2  C1
                   + ---------- + ---------- +
                   |     S0     |     S0     |
                H1 |  T0    T1  |H1 T0   T1  | H1
                   |S3        S1|S3        S1|
                H2 |  T3    T2  |H2 T3   T2  | H2
                   |     S2     |     S2     |
                   + ---------- + ---------- +
                  C3   H1  H2 C2 C3 H1  H2   C2

The mesh is stored internally as an array of nodes that includes the tensor nodes.

Note: This code uses tensor points which are not part of the SVG2 plan at the moment. Including tensor points was motivated by a desire to experiment with their usefulness in smoothing color transitions. There doesn't seem to be much advantage for that purpose. However including them internally allows for storing all the points in an array which simplifies things like inserting new rows or columns.

Enumerator
SP_MESH_TYPE_COONS
SP_MESH_TYPE_BICUBIC

Definition at line 52 of file sp-mesh-array.h.