124 lines
3.1 KiB
Go
124 lines
3.1 KiB
Go
package writer
|
|
|
|
import (
|
|
"errors"
|
|
"image"
|
|
"image/color"
|
|
"image/draw"
|
|
"image/png"
|
|
"maze-solver/maze"
|
|
"maze-solver/utils"
|
|
"os"
|
|
|
|
"github.com/mazznoer/colorgrad"
|
|
)
|
|
|
|
type ImageWriter struct {
|
|
Filename string
|
|
Maze *maze.SolvedMaze
|
|
CellWidth, CellHeight int
|
|
WallColor, PathColor color.Color
|
|
SolutionGradient colorgrad.Gradient
|
|
img *image.RGBA
|
|
}
|
|
|
|
func (w *ImageWriter) Write() error {
|
|
defer utils.Timer("Image writer", 3)()
|
|
if w.Filename[len(w.Filename)-4:] != ".png" {
|
|
return errors.New("Filename of ImageWriter doesn't have .png extension. The only suppported image type is png")
|
|
}
|
|
|
|
w.img = image.NewRGBA(image.Rect(0, 0, w.Maze.Width*w.CellWidth, w.Maze.Height*w.CellHeight))
|
|
|
|
// Fill the image with walls
|
|
draw.Draw(w.img, w.img.Bounds(), &image.Uniform{w.WallColor}, image.Pt(0, 0), draw.Src)
|
|
|
|
// Fill in the paths
|
|
var x0, y0, width, height int
|
|
for _, node := range w.Maze.Nodes {
|
|
x0 = node.Coords.X * w.CellWidth
|
|
y0 = node.Coords.Y * w.CellHeight
|
|
if node.Right != nil {
|
|
width = (node.Right.Coords.X - node.Coords.X + 1) * w.CellWidth
|
|
height = w.CellHeight
|
|
w.draw(x0, y0, width, height, w.PathColor)
|
|
}
|
|
|
|
if node.Down != nil {
|
|
width = w.CellWidth
|
|
height = (node.Down.Coords.Y - node.Coords.Y + 1) * w.CellHeight
|
|
w.draw(x0, y0, width, height, w.PathColor)
|
|
}
|
|
}
|
|
|
|
// Fill in the solution
|
|
total_len := w.getSolutionLength()
|
|
colors := w.SolutionGradient.Colors(uint(total_len + 1))
|
|
c := 0
|
|
width, height = w.CellWidth, w.CellHeight
|
|
for i, from := range w.Maze.Solution[:len(w.Maze.Solution)-1] {
|
|
to := w.Maze.Solution[i+1]
|
|
|
|
if from.Coords.X == to.Coords.X {
|
|
// Fill verticallly
|
|
x0 = from.Coords.X * w.CellWidth
|
|
|
|
if from.Coords.Y < to.Coords.Y {
|
|
for y := from.Coords.Y; y < to.Coords.Y; y++ {
|
|
y0 = y * w.CellHeight
|
|
w.draw(x0, y0, width, height, colors[c])
|
|
c++
|
|
}
|
|
} else {
|
|
for y := from.Coords.Y; y > to.Coords.Y; y-- {
|
|
y0 = y * w.CellHeight
|
|
w.draw(x0, y0, width, height, colors[c])
|
|
c++
|
|
}
|
|
}
|
|
y0 = to.Coords.Y * w.CellHeight
|
|
w.draw(x0, y0, width, height, colors[c])
|
|
} else {
|
|
// Fill horizontally
|
|
y0 = from.Coords.Y * w.CellHeight
|
|
|
|
if from.Coords.X < to.Coords.X {
|
|
for x := from.Coords.X; x < to.Coords.X; x++ {
|
|
x0 = x * w.CellWidth
|
|
w.draw(x0, y0, width, height, colors[c])
|
|
c++
|
|
}
|
|
} else {
|
|
for x := from.Coords.X; x > to.Coords.X; x-- {
|
|
x0 = x * w.CellWidth
|
|
w.draw(x0, y0, width, height, colors[c])
|
|
c++
|
|
}
|
|
}
|
|
x0 = to.Coords.X * w.CellWidth
|
|
w.draw(x0, y0, width, height, colors[c])
|
|
}
|
|
}
|
|
|
|
f, err := os.Create(w.Filename)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
png.Encode(f, w.img)
|
|
f.Close()
|
|
return nil
|
|
}
|
|
|
|
func (w *ImageWriter) getSolutionLength() int {
|
|
ret := 0
|
|
for i, node := range w.Maze.Solution[:len(w.Maze.Solution)-1] {
|
|
next := w.Maze.Solution[i+1]
|
|
ret += int(node.Coords.Distance(next.Coords))
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func (w *ImageWriter) draw(x0, y0, width, height int, color color.Color) {
|
|
draw.Draw(w.img, image.Rect(x0, y0, x0+width, y0+height), &image.Uniform{color}, image.Pt(0, 0), draw.Src)
|
|
}
|