canvas-wasm

Canvas functions suitable for WebAssembly

Canvas's CanvasRenderingContext2D has several methods, setters, and getters not suitable for WebAssembly. Use this module to wrap a context for making it suitable.

Notice: This is experimental and doesn't include a lot of things. Currently nothing using memory is made.

• Pixel/image manipulation
• Gradients and patterns
• Text objects and styling
• Hit regions
• Other non-standard APIs

Install

npm i canvas-wasm

Note: See browserify and wasmify for an easy way to building WASM projects.

Usage

create_*

Creating shapes without using paths

• create_rect(x, y, width, height)

path_*

• path_begin()
• path_close()
• path_move(x, y)
• path_line(x, y)
• path_fill()
• path_stroke()
• path_bezier_curve(c1x, c1y, c2x, c2y, x, y)
• path_quadradic_curve(cx, cy, x, y)
• path_circle(x, y, radius)
• path_arc(x, y, radius, startAngle, endAngle)
• path_ellipse(x, y, rx, ry, rot, startAngle, endAngle)
• path_rect(x, y, width, height)

clear_*

• clear()
• clear_rect(x, y, width, height)

set_*

• set_stroke_color(r, g, b)
• set_fill_color(r, g, b)
• set_line_width(w)
• set_line_cap(0 | 1 | 2)
  • butt, join, square respectively
• set_line_join(0 | 1 | 2)
  • round, bevel, miter respectively
• set_shadow_blur(x)
• set_shadow_color(r, g, b, a)
• set_shadow_offset_x(x)
• set_shadow_offset_y(y)

transform_*

• transform_rotate(deg)
• transform_scale(x, y)
• transform_translate(x, y)
• transform(a, b, c, d, e, f)
• set_transform(a, b, c, d, e, f)
• reset_transform()

State functions

• save()
• restore()