gena is a Go package to create generative art.
See example code in cmd/circle.go.
There are a few ways of creating a context.
NewContext(size V2) *Context
NewContextFromRGBA(im *image.RGBA) *ContextDrawPoint(pos V2, r float64)
DrawLine(from, to V2)
DrawRectangle(topLeft, size V2)
DrawRoundedRectangle(topLeft, size V2, r float64)
DrawCircle(center V2, r float64)
DrawArc(center V2, r, angle1, angle2 float64)
DrawEllipse(center, r V2)
DrawEllipticalArc(center, r V2, angle1, angle2 float64)
DrawRegularPolygon(n int, center V2, r, rotation float64)
DrawImage(im image.Image, pos V2)
DrawImageAnchored(im image.Image, pos, a V2)
SetPixel(pos V2)
MoveTo(pos V2)
LineTo(pos V2)
QuadraticTo(v1, v2 V2)
CubicTo(v1, v2, v3 V2)
ClearPath()
NewSubPath()
ClosePath()
Clear()
Stroke()
Fill()
StrokePreserve()
FillPreserve()It is often desired to center an image at a point. Use DrawImageAnchored with a set to 0.5 to do this. Use 0 to left or top align. Use 1 to right or bottom align. DrawStringAnchored does the same for text, so you don't need to call MeasureString yourself.
It will even do word wrap for you!
DrawString(s string, v V2)
DrawStringAnchored(s string, v, a V2)
DrawStringWrapped(s string, v, a V2, width, lineSpacing float64, align Align)
MeasureString(s string) V2
MeasureMultilineString(s string, lineSpacing float64) V2
WordWrap(s string, w float64) []string
SetFontFace(fontFace font.Face)
LoadFontFace(path string, points float64) errorColorRGB(r, g, b float64) color.Color
ColorRGBA(r, g, b, a float64) color.Color
ColorRGB255(r, g, b int) color.Color
ColorRGBA255(r, g, b, a int) color.Color
ColorHex(x string) color.ColorSetLineWidth(lineWidth float64)
SetLineCap(lineCap LineCap)
SetLineJoin(lineJoin LineJoin)
SetDash(dashes ...float64)
SetDashOffset(offset float64)
SetFillRule(fillRule FillRule)Linear, radial and conic gradients are supported. You can also use surface patterns or implement your own.
// apply patterns
SetFillStyle(pattern Pattern)
SetStrokeStyle(pattern Pattern)
// builtin patterns
PatternSolid(color color.Color) Pattern
PatternGradientLinear(v0, v1 V2) Pattern
PatternGradientRadial(v0 V2, r0 float64, v1 V2, r1 float64) Pattern
PatternGradientConic(c V2, deg float64) Pattern
PatternPatternSurface(im image.Image, op RepeatOp) PatternIdentity()
Translate(v V2)
Scale(v V2)
Rotate(angle float64)
Shear(v V2)
ScaleAbout(s, v V2)
RotateAbout(angle float64, v V2)
ShearAbout(s, v V2)
TransformPoint(v V2) V2
InvertY()It is often desired to rotate or scale about a point that is not the origin. The functions RotateAbout, ScaleAbout, ShearAbout are provided as a convenience.
InvertY is provided in case Y should increase from bottom to top. The default is top to bottom.
Use clipping regions to restrict drawing operations to an area that you defined using paths.
Clip()
ClipPreserve()
ResetClip()
AsMask() *image.Alpha
SetMask(mask *image.Alpha)
InvertMask()Radians(degrees float64) float64
Degrees(radians float64) float64
LoadImage(path string) image.Image
SavePNG(path string, im image.Image)
SaveJPG(path string, im image.Image, quality uint8)
Source: https://iquilezles.org/articles/warp/
Source: https://openprocessing.org/sketch/1102157
