gridder 
Built on top of Go Graphics github.com/fogleman/gg with the idea to simplify visualizing Grids using 2D Graphics.
Dependencies
Install
go get github.com/shomali11/gridder
Examples
Example 1
Exploring the GridConfig configuration object. The Rows and Columns represent the rows and columns of the grid you wish to visualize. You can customize the grid by playing various options from style, color and width.
package main
import (
"image/color"
"log"
"github.com/shomali11/gridder"
)
func main() {
imageConfig := gridder.ImageConfig{Name: "example1.png"}
gridConfig := gridder.GridConfig{
Rows: 4,
Columns: 8,
MarginWidth: 0,
LineDashes: 0,
LineStrokeWidth: 2,
BorderDashes: 0,
BorderStrokeWidth: 10,
LineColor: color.Gray{},
BorderColor: color.RGBA{B: 255, A: 255},
BackgroundColor: color.White,
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
grid.SavePNG()
}
Example 2
Exploring the ImageConfig configuration object. This defines the image that will be generated. You can customize the Width and Height to generate larger images.
package main
import (
"image/color"
"log"
"github.com/shomali11/gridder"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 500,
Height: 500,
Name: "example2.png",
}
gridConfig := gridder.GridConfig{
Rows: 4,
Columns: 4,
MarginWidth: 20,
LineDashes: 10,
LineStrokeWidth: 2,
BorderDashes: 20,
BorderStrokeWidth: 4,
LineColor: color.RGBA{R: 255 / 2, A: 255},
BorderColor: color.RGBA{B: 255 / 2, A: 255},
BackgroundColor: color.RGBA{G: 255 / 2, A: 255},
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
grid.SavePNG()
}
Example 3
Using PaintCell to paint a cell by the grid's row and column
package main
import (
"image/color"
"log"
"github.com/shomali11/gridder"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 500,
Height: 500,
Name: "example3.png",
}
gridConfig := gridder.GridConfig{
Rows: 4,
Columns: 4,
LineStrokeWidth: 2,
BorderStrokeWidth: 4,
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
grid.PaintCell(1, 2, color.Black)
grid.SavePNG()
}
Example 4
Using DrawRectangle to draw rectangles in cells with various stylistic properties
package main
import (
"image/color"
"log"
"github.com/shomali11/gridder"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 500,
Height: 500,
Name: "example4.png",
}
gridConfig := gridder.GridConfig{
Rows: 4,
Columns: 4,
LineStrokeWidth: 2,
BorderStrokeWidth: 4,
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
grid.DrawRectangle(0, 0, gridder.RectangleConfig{Width: 60, Height: 60, Color: color.Black, Stroke: true, Rotate: 45})
grid.DrawRectangle(3, 0, gridder.RectangleConfig{Width: 60, Height: 60, Color: color.Black, Stroke: true, Rotate: 45, Dashes: 10})
grid.DrawRectangle(0, 3, gridder.RectangleConfig{Width: 60, Height: 60, Color: color.Black, Stroke: true, StrokeWidth: 25})
grid.DrawRectangle(2, 1, gridder.RectangleConfig{Width: 180, Height: 180, Color: color.RGBA{R: 255 / 2, A: 255 / 2}})
grid.DrawRectangle(3, 3, gridder.RectangleConfig{Width: 60, Height: 60, Color: color.Black, Stroke: false})
grid.SavePNG()
}
Example 5
Using DrawCircle to draw circles in cells with various stylistic properties
package main
import (
"image/color"
"log"
"github.com/shomali11/gridder"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 500,
Height: 500,
Name: "example5.png",
}
gridConfig := gridder.GridConfig{
Rows: 4,
Columns: 4,
LineStrokeWidth: 2,
BorderStrokeWidth: 4,
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
grid.DrawCircle(0, 0, gridder.CircleConfig{Radius: 30, Color: color.Black, Stroke: true})
grid.DrawCircle(3, 0, gridder.CircleConfig{Radius: 30, Color: color.Black, Stroke: true, Dashes: 10})
grid.DrawCircle(0, 3, gridder.CircleConfig{Radius: 30, Color: color.Black, Stroke: true, StrokeWidth: 25})
grid.DrawCircle(2, 1, gridder.CircleConfig{Radius: 90, Color: color.RGBA{R: 255 / 2, A: 255 / 2}})
grid.DrawCircle(3, 3, gridder.CircleConfig{Radius: 30, Color: color.Black, Stroke: false})
grid.SavePNG()
}
Example 6
Using DrawLine to draw lines in cells with various stylistic properties
package main
import (
"image/color"
"log"
"github.com/shomali11/gridder"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 500,
Height: 500,
Name: "example6.png",
}
gridConfig := gridder.GridConfig{
Rows: 4,
Columns: 4,
MarginWidth: 30,
LineStrokeWidth: 2,
BorderStrokeWidth: 4,
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
grid.DrawLine(0, 0, gridder.LineConfig{Length: 60, Color: color.Black, Dashes: 0})
grid.DrawLine(0, 0, gridder.LineConfig{Length: 60, Color: color.Black, Dashes: 0, Rotate: 90})
grid.DrawLine(0, 3, gridder.LineConfig{Length: 60, Color: color.Black, Dashes: 0, StrokeWidth: 25})
grid.DrawLine(2, 1, gridder.LineConfig{Length: 90, Color: color.RGBA{R: 255 / 2, A: 255 / 2}, Rotate: 45})
grid.DrawLine(2, 1, gridder.LineConfig{Length: 90, Color: color.RGBA{R: 255 / 2, A: 255 / 2}, Rotate: 135})
grid.DrawLine(3, 3, gridder.LineConfig{Length: 60, Color: color.Black, Dashes: 5})
grid.SavePNG()
}
Example 7
Using DrawPath to draw a path between two cells with various stylistic properties
package main
import (
"image/color"
"log"
"github.com/shomali11/gridder"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 500,
Height: 500,
Name: "example7.png",
}
gridConfig := gridder.GridConfig{
Rows: 4,
Columns: 4,
LineStrokeWidth: 2,
BorderStrokeWidth: 4,
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
grid.DrawPath(0, 0, 1, 1, gridder.PathConfig{Dashes: 0, StrokeWidth: 10, Color: color.Black})
grid.DrawPath(1, 1, 2, 1, gridder.PathConfig{Dashes: 5, StrokeWidth: 1, Color: color.Black})
grid.DrawPath(2, 1, 3, 1, gridder.PathConfig{Dashes: 8, StrokeWidth: 1, Color: color.Black})
grid.DrawPath(3, 1, 3, 2, gridder.PathConfig{Dashes: 0, StrokeWidth: 1, Color: color.Black})
grid.SavePNG()
}
Example 8
Using DrawString to draw a string in a cell with various stylistic properties
package main
import (
"image/color"
"log"
"github.com/golang/freetype/truetype"
"github.com/shomali11/gridder"
"golang.org/x/image/font/gofont/goregular"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 500,
Height: 500,
Name: "example8.png",
}
gridConfig := gridder.GridConfig{
Rows: 4,
Columns: 4,
LineStrokeWidth: 2,
BorderStrokeWidth: 4,
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
font, err := truetype.Parse(goregular.TTF)
if err != nil {
log.Fatal(err)
}
fontFace1 := truetype.NewFace(font, &truetype.Options{Size: 24})
fontFace2 := truetype.NewFace(font, &truetype.Options{Size: 35})
grid.DrawString(0, 0, "Hello!", fontFace1)
grid.DrawString(1, 1, "Hello!", fontFace1, gridder.StringConfig{Rotate: 45})
grid.DrawString(2, 2, "Hello!", fontFace2, gridder.StringConfig{Color: color.RGBA{B: 255 / 2, A: 255 / 2}})
grid.SavePNG()
}
Example 9
Combining multiple features to draw the shortest path on a grid
package main
import (
"image/color"
"log"
"github.com/golang/freetype/truetype"
"github.com/shomali11/gridder"
"golang.org/x/image/font/gofont/goregular"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 2000,
Height: 1000,
Name: "example9.png",
}
gridConfig := gridder.GridConfig{
Rows: 4,
Columns: 8,
MarginWidth: 32,
LineStrokeWidth: 2,
BorderStrokeWidth: 20,
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
font, err := truetype.Parse(goregular.TTF)
if err != nil {
log.Fatal(err)
}
fontFace := truetype.NewFace(font, &truetype.Options{Size: 48})
lineConfig := gridder.PathConfig{Dashes: 10}
circleConfig := gridder.CircleConfig{Color: color.Gray{}, Radius: 10}
grid.PaintCell(1, 2, color.NRGBA{R: 0, G: 0, B: 0, A: 255 / 2})
grid.DrawString(1, 2, "Block", fontFace)
grid.DrawCircle(0, 0, gridder.CircleConfig{Color: color.NRGBA{R: 255 / 2, G: 0, B: 0, A: 255 / 2}, Radius: 60})
grid.DrawPath(0, 0, 1, 1, lineConfig)
grid.DrawCircle(1, 1, circleConfig)
grid.DrawPath(1, 1, 2, 2, lineConfig)
grid.DrawCircle(2, 2, circleConfig)
grid.DrawPath(2, 2, 2, 3, lineConfig)
grid.DrawCircle(2, 3, circleConfig)
grid.DrawPath(2, 3, 2, 4, lineConfig)
grid.DrawCircle(2, 4, circleConfig)
grid.DrawPath(2, 4, 2, 5, lineConfig)
grid.DrawCircle(2, 5, circleConfig)
grid.DrawPath(2, 5, 2, 6, lineConfig)
grid.DrawCircle(2, 6, circleConfig)
grid.DrawPath(2, 6, 3, 7, lineConfig)
grid.DrawCircle(3, 7, gridder.CircleConfig{Color: color.NRGBA{R: 0, G: 255 / 2, B: 0, A: 255 / 2}, Radius: 60})
grid.SavePNG()
}
Example 10
Combining multiple features to draw a Bingo card
package main
import (
"image/color"
"log"
"github.com/golang/freetype/truetype"
"github.com/shomali11/gridder"
"golang.org/x/image/font/gofont/goregular"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 1000,
Height: 1200,
Name: "example10.png",
}
gridConfig := gridder.GridConfig{
Rows: 6,
Columns: 5,
MarginWidth: 32,
LineStrokeWidth: 2,
BackgroundColor: color.RGBA{R: 135, G: 211, B: 124, A: 255},
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
font, err := truetype.Parse(goregular.TTF)
if err != nil {
log.Fatal(err)
}
headerFontFace := truetype.NewFace(font, &truetype.Options{Size: 100})
valueFontFace := truetype.NewFace(font, &truetype.Options{Size: 50})
headers := []string{"B", "I", "N", "G", "O"}
values := [][]string{
{"10", "22", "41", "53", "71"},
{"66", "20", "40", "50", "2"},
{"14", "26", "FREE", "52", "69"},
{"15", "29", "37", "51", "65"},
{"17", "6", "35", "55", "64"},
}
circleConfig := gridder.CircleConfig{Radius: 60, Color: color.White}
for i, header := range headers {
grid.DrawCircle(0, i, circleConfig)
grid.DrawString(0, i, header, headerFontFace)
}
for row := range values {
for column := range values[0] {
grid.PaintCell(row+1, column, color.White)
grid.DrawString(row+1, column, values[row][column], valueFontFace)
}
}
grid.SavePNG()
}
Example 11
Combining multiple features to draw a Tic Tac Toe game
package main
import (
"image/color"
"log"
"github.com/shomali11/gridder"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 500,
Height: 500,
Name: "example11.png",
}
gridConfig := gridder.GridConfig{
Rows: 3,
Columns: 3,
LineStrokeWidth: 2,
BorderStrokeWidth: 4,
LineColor: color.Gray{},
BorderColor: color.Gray{},
BackgroundColor: color.NRGBA{R: 220, G: 220, B: 220, A: 255},
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
blue := color.RGBA{B: 128, A: 255}
green := color.RGBA{G: 128, A: 255}
grid.DrawCircle(0, 0, gridder.CircleConfig{Radius: 60, Color: blue, StrokeWidth: 4, Stroke: true})
grid.DrawCircle(1, 1, gridder.CircleConfig{Radius: 60, Color: blue, StrokeWidth: 4, Stroke: true})
grid.DrawCircle(2, 2, gridder.CircleConfig{Radius: 60, Color: blue, StrokeWidth: 4, Stroke: true})
grid.DrawLine(2, 0, gridder.LineConfig{Length: 120, Color: green, StrokeWidth: 4, Rotate: 45})
grid.DrawLine(2, 0, gridder.LineConfig{Length: 120, Color: green, StrokeWidth: 4, Rotate: 135})
grid.DrawLine(2, 1, gridder.LineConfig{Length: 120, Color: green, StrokeWidth: 4, Rotate: 45})
grid.DrawLine(2, 1, gridder.LineConfig{Length: 120, Color: green, StrokeWidth: 4, Rotate: 135})
grid.DrawPath(0, 0, 2, 2, gridder.PathConfig{StrokeWidth: 4, Color: color.RGBA{R: 128, A: 255}})
grid.SavePNG()
}
Example 12
Extract image as a byte array. Useful for recording image in a store in text format as example below.
package main
import (
"bytes"
"encoding/base64"
"image/color"
"log"
"math/rand"
"os"
"time"
"github.com/shomali11/gridder"
)
func main() {
imageConfig := gridder.ImageConfig{
Width: 500,
Height: 500,
Name: "example12.png",
}
gridConfig := gridder.GridConfig{
Rows: 20,
Columns: 20,
LineStrokeWidth: 2,
BorderStrokeWidth: 4,
LineColor: color.Gray{},
BorderColor: color.Gray{},
BackgroundColor: color.NRGBA{R: 220, G: 220, B: 220, A: 255},
}
grid, err := gridder.New(imageConfig, gridConfig)
if err != nil {
log.Fatal(err)
}
blue := color.RGBA{B: 128, A: 255}
// create a random chart
rand.Seed(time.Now().UnixNano())
for col := 0; col < gridConfig.Columns; col++ {
height := rand.Intn(gridConfig.Rows-1)
for topRow := 0; topRow < height; topRow++ {
grid.DrawCircle(gridConfig.Rows-topRow, col, gridder.CircleConfig{Radius: 5, Color: blue, StrokeWidth: 4, Stroke: true})
}
}
// encode image as byte string
bImage := new(bytes.Buffer)
grid.EncodePNG(bImage)
// convert to base64 string to support storing into database
imageString := base64.StdEncoding.EncodeToString(bImage.Bytes())
// convert back from string and save as binary image
bDecodedImage, err := base64.StdEncoding.DecodeString(imageString)
if err != nil {
log.Fatal(err)
}
err = os.WriteFile(imageConfig.Name, bDecodedImage, 0644)
if err != nil {
log.Fatal(err)
}
}