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canvas.go
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canvas.go
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package main
import (
"fmt"
"image/color"
"math"
"time"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/text"
)
type Canvas struct {
x, y float64
w, h int
rect *ebiten.Image
op ebiten.DrawImageOptions
title string
titleW int
grid Grid
}
func (c Canvas) TopLeftX() float64 {
return c.x
}
func NewCanvas(w, h int, x, y float64, title string) Canvas {
rect := ebiten.NewImage(w, h)
rect.Fill(color.RGBA{25, 25, 25, 255})
op := ebiten.DrawImageOptions{}
op.GeoM.Translate(x, y)
return Canvas{
rect: rect,
op: op,
title: title,
x: x, y: y, w: w, h: h,
titleW: text.BoundString(mononokiFFace, title).Dx(),
}
}
func (c *Canvas) SetGrid(grid Grid) {
canvasSize = len(grid.Cells)
cellSize = (c.w - len(grid.Cells)) / len(grid.Cells)
c.grid = grid
}
func (c *Canvas) Draw(screen *ebiten.Image) {
textColor := color.RGBA{255, 255, 255, 255}
if c.grid.Status == STATUS_END_NOPATH {
textColor = color.RGBA{213, 60, 60, 255}
} else if c.grid.Status == STATUS_END_SUCCESS {
textColor = color.RGBA{60, 213, 60, 255}
}
timeDiff := time.Now().Sub(c.grid.StartTime)
if c.grid.Status != STATUS_PATHING {
timeDiff = c.grid.EndTime.Sub(c.grid.StartTime)
}
text.Draw(screen, fmt.Sprintf("Path length: %d | Iterations: %d | Time: %.2fs",
c.grid.PathLength, c.grid.Iterations, timeDiff.Seconds()), mononokiFFace, int(c.x)+c.w/2-240, int(c.y)+c.h+22, textColor)
// Rect byte buffer
rowSize := c.w * 4
bytes := make([]byte, c.w*c.w*4)
bytes[0] = 255
for i := range bytes {
bytes[i] = 0x00
}
for i, row := range c.grid.Cells {
for j, node := range row {
nodeColor := color.RGBA{100, 100, 100, 255}
if node.IsWall {
nodeColor = color.RGBA{30, 30, 30, 255}
} else if node.Coord == c.grid.Start.Coord {
nodeColor = color.RGBA{60, 213, 60, 255}
} else if node.Coord == c.grid.End.Coord {
nodeColor = color.RGBA{213, 60, 60, 255}
} else if node.IsPath {
nodeColor = color.RGBA{255, 255, 255, 255}
} else if node.Visited {
nodeColor = color.RGBA{50, 139, 181, 255}
} else if node.Added {
nodeColor = color.RGBA{62, 190, 250, 255}
}
drawNodePixels(i, j, cellSize, rowSize, &bytes, nodeColor)
}
}
c.rect.WritePixels(bytes)
screen.DrawImage(c.rect, &c.op)
text.Draw(screen, c.title, mononokiFFace, int(c.x)+c.w/2-c.titleW/2, 33, color.White)
}
func drawNodePixels(cellI, cellJ int, cellSize int, rowSize int, bytes *[]byte, cellColor color.RGBA) {
for i := 0; i < cellSize; i++ {
for j := 0; j < cellSize; j++ {
index := i * rowSize // Vertical displacement
index += rowSize * cellI // One pixel margin (between rows)
index += cellI * rowSize * cellSize // Vertical specific displacement
index += 4 * j // Horizontal displacement
index += 4 * (cellJ * cellSize) // Horizontal specific displacement
index += 4 * cellJ // One pixel margin (between cols)
(*bytes)[index] = cellColor.R
(*bytes)[index+1] = cellColor.G
(*bytes)[index+2] = cellColor.B
(*bytes)[index+3] = cellColor.A
}
}
}
func mousePosCoords(canvasA, canvasB *Canvas, pos_x, pos_y int) (int, int, *Canvas) {
var clickedCanvas *Canvas = nil
if pos_x >= int(canvasA.x) && pos_x <= int(canvasA.x)+canvasA.w && pos_y >= int(canvasA.y) && pos_y <= int(canvasA.y)+canvasA.h {
clickedCanvas = canvasA
} else if pos_x >= int(canvasB.x) && pos_x <= int(canvasB.x)+canvasB.w && pos_y >= int(canvasB.y) && pos_y <= int(canvasA.y)+canvasB.h {
clickedCanvas = canvasB
}
if clickedCanvas == nil {
return -1, -1, nil
}
relativeCellSize := (clickedCanvas.w) / len(clickedCanvas.grid.Cells)
x, y := pos_x-int(clickedCanvas.x), pos_y-int(clickedCanvas.y)
j, i := int(math.Floor(float64(x)/float64(relativeCellSize))), int(math.Floor(float64(y)/float64(relativeCellSize)))
if i >= 0 && i < len(clickedCanvas.grid.Cells) && j >= 0 && j < len(clickedCanvas.grid.Cells[0]) {
return i, j, clickedCanvas
}
return -1, -1, nil
}