Return the rendering base point.
The entity traits object gives the user control of, and access to, the attribute (color, layer, linetype, etc.) settings of the current geometry.
Draw one area
Input area to draw
Return an object which can be added to scene
Draw a circular arc or full circle.
Input circular arc to draw
Return an object which can be added to scene
Draw an elliptical arc or full ellipse.
Input elliptical arc to draw
Return an object which can be added to scene
Draw image
Input Blob instance of one image file
Input image style
Return an object which can be added to scene
Draw lines using gl.LINE_STRIP.
Input a point array which contains all line vertices
Return an object which can be added to scene
Draw lines using gl.LINES.
Must be a TypedArray. Used to instantiate the buffer. This array should have
itemSize * numVertices elements, where numVertices is the number of vertices.
The number of values of the array that should be associated with a
particular vertex. If the vertex is one 2d point, then itemSize should be 2. If the vertex
is one 3d point, then itemSize should be 3.
Index buffer.
Return an object which can be added to scene
Draw multiple line texts
Input multiple line text data to draw
Input text style applied to the text string
Optionaldelay: booleanThe flag to delay creating one rendered entity and just create one dummy entity. Renderer can delay heavy calculation operation to avoid blocking UI when this flag is true.
Return an object which can be added to scene
Draw a point.
Input point to draw
Input point style applied to point
Return an object which can be added to scene
Set font mapping
JavaScript (and WebGL) use 64‑bit floating point numbers for CPU-side calculations, but GPU shaders typically use 32‑bit floats. A 32-bit float has ~7.2 decimal digits of precision. If passing 64-bit floating vertices data to GPU directly, it will destroy number preciesion.
So we adopt a simpler but effective version of the “origin-shift” idea. Recompute geometry using re-centered coordinates and apply offset to its position. The base point is extractly offset value.
Get the rendering base point.