Documentation
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Overview ¶
Package pngcanvas implements a canvas type as an adapter to the Go-Graphics drawing library.
Note: With the image/vector package, this package seems to be unnecessary. It will probably be smarter to draw to an SVG canvas and then use package vector's rasterizer to produce a pixel image.
BSD License ¶
Copyright (c) 2017, Norbert Pillmayer <norbert@pillmayer.com>
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. Neither the name of Norbert Pillmayer nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Index ¶
- func NewCanvas(width, height float64) gfx.Canvas
- func T() tracing.Trace
- type GGCanvas
- func (ggc *GGCanvas) AddContour(contour gfx.DrawableContour, linethickness float64, linecol color.Color, ...)
- func (ggc *GGCanvas) AsImage() image.Image
- func (ggc *GGCanvas) H() float64
- func (ggc *GGCanvas) SetOption(opts int)
- func (ggc *GGCanvas) Shipout(w io.Writer) bool
- func (ggc *GGCanvas) W() float64
- type PNGOutputRoutine
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
Types ¶
type GGCanvas ¶
type GGCanvas struct {
// contains filtered or unexported fields
}
A canvas type as a bridge to the Go Graphics drawing package.
func (*GGCanvas) AddContour ¶
func (ggc *GGCanvas) AddContour(contour gfx.DrawableContour, linethickness float64, linecol color.Color, fillcol color.Color)
Interface Canvas. Add a stroke to the graphics context. If linecol is non-void, a line will be drawn. If fillcol is non-void and the path is closed, the path's inside area will be filled.
If tracing mode is DebugLevel red dots are drawn for the contour's knots.
func (*GGCanvas) SetOption ¶
Interface Canvas. Set drawing options. Currently only gfx.PENSQUARE and gfx.PENCIRCLE are understood. They determine linecap and and linejoin parameters.
type PNGOutputRoutine ¶
type PNGOutputRoutine struct {
// contains filtered or unexported fields
}
Output routine to produce PNG format files.
func NewPNGOutputRoutine ¶
func NewPNGOutputRoutine() *PNGOutputRoutine
Create a new PNG output routine.
Source Files