From ba761383ac164f5b983786bf2ff891ac5ec31a7d Mon Sep 17 00:00:00 2001 From: faiface Date: Sat, 27 May 2017 19:19:31 +0200 Subject: [PATCH 1/4] remove profiling from typewriter example --- typewriter/main.go | 2 -- 1 file changed, 2 deletions(-) diff --git a/typewriter/main.go b/typewriter/main.go index 820fb2c..d7691ff 100644 --- a/typewriter/main.go +++ b/typewriter/main.go @@ -13,7 +13,6 @@ import ( "github.com/faiface/pixel/pixelgl" "github.com/faiface/pixel/text" "github.com/golang/freetype/truetype" - "github.com/pkg/profile" "golang.org/x/image/colornames" "golang.org/x/image/font" "golang.org/x/image/font/gofont/gobold" @@ -317,6 +316,5 @@ func run() { } func main() { - defer profile.Start(profile.MemProfile).Stop() pixelgl.Run(run) } From 3e4b1b8ebdd3ad0ce05a1ca03113819ec9044d36 Mon Sep 17 00:00:00 2001 From: faiface Date: Sun, 28 May 2017 00:06:29 +0200 Subject: [PATCH 2/4] minorly simplify typewriter example --- typewriter/main.go | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/typewriter/main.go b/typewriter/main.go index d7691ff..24ee972 100644 --- a/typewriter/main.go +++ b/typewriter/main.go @@ -227,10 +227,7 @@ func (dl *dotlight) Draw(t pixel.Target, m pixel.Matrix) { dl.imd.Color = pixel.Alpha(0) for i := 0.0; i <= 32; i++ { angle := i * 2 * math.Pi / 32 - dl.imd.Push(dl.pos.Add(pixel.V( - math.Cos(angle)*dl.radius, - math.Sin(angle)*dl.radius, - ))) + dl.imd.Push(dl.pos.Add(pixel.V(dl.radius, 0).Rotated(angle))) } dl.imd.Polygon(0) dl.imd.Draw(t) From be077d6e60fb1dc49a934346d26e73feecb92efc Mon Sep 17 00:00:00 2001 From: faiface Date: Tue, 30 May 2017 02:52:33 +0200 Subject: [PATCH 3/4] add 07 guide code --- .../intuitive.ttf | Bin 0 -> 49552 bytes guide/07_typing_text_on_the_screen/main.go | 78 ++++++++++++++++++ 2 files changed, 78 insertions(+) create mode 100644 guide/07_typing_text_on_the_screen/intuitive.ttf create mode 100644 guide/07_typing_text_on_the_screen/main.go diff --git 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diff --git a/guide/07_typing_text_on_the_screen/main.go b/guide/07_typing_text_on_the_screen/main.go new file mode 100644 index 0000000..caaa0da --- /dev/null +++ b/guide/07_typing_text_on_the_screen/main.go @@ -0,0 +1,78 @@ +package main + +import ( + "io/ioutil" + "os" + "time" + + "github.com/faiface/pixel" + "github.com/faiface/pixel/pixelgl" + "github.com/faiface/pixel/text" + "github.com/golang/freetype/truetype" + "golang.org/x/image/colornames" + "golang.org/x/image/font" +) + +func loadTTF(path string, size float64) (font.Face, error) { + file, err := os.Open(path) + if err != nil { + return nil, err + } + defer file.Close() + + bytes, err := ioutil.ReadAll(file) + if err != nil { + return nil, err + } + + font, err := truetype.Parse(bytes) + if err != nil { + return nil, err + } + + return truetype.NewFace(font, &truetype.Options{ + Size: size, + GlyphCacheEntries: 1, + }), nil +} + +func run() { + cfg := pixelgl.WindowConfig{ + Title: "Pixel Rocks!", + Bounds: pixel.R(0, 0, 1024, 768), + } + win, err := pixelgl.NewWindow(cfg) + if err != nil { + panic(err) + } + win.SetSmooth(true) + + face, err := loadTTF("intuitive.ttf", 80) + if err != nil { + panic(err) + } + + atlas := text.NewAtlas(face, text.ASCII) + txt := text.New(pixel.V(50, 500), atlas) + + txt.Color = colornames.Lightgrey + + fps := time.Tick(time.Second / 120) + + for !win.Closed() { + txt.WriteString(win.Typed()) + if win.JustPressed(pixelgl.KeyEnter) || win.Repeated(pixelgl.KeyEnter) { + txt.WriteRune('\n') + } + + win.Clear(colornames.Darkcyan) + txt.Draw(win, pixel.IM.Moved(win.Bounds().Center().Sub(txt.Bounds().Center()))) + win.Update() + + <-fps + } +} + +func main() { + pixelgl.Run(run) +} From 1e166f45f2760182eb6ee91619a4f8ae11754508 Mon Sep 17 00:00:00 2001 From: faiface Date: Tue, 30 May 2017 13:30:09 +0200 Subject: [PATCH 4/4] add maze generator community example --- community/maze/LICENSE | 21 ++ community/maze/README.md | 19 ++ community/maze/maze-generator.go | 317 +++++++++++++++++++++++++++++++ community/maze/screenshot.png | Bin 0 -> 14155 bytes community/maze/stack/stack.go | 86 +++++++++ 5 files changed, 443 insertions(+) create mode 100644 community/maze/LICENSE create mode 100644 community/maze/README.md create mode 100644 community/maze/maze-generator.go create mode 100644 community/maze/screenshot.png create mode 100644 community/maze/stack/stack.go diff --git a/community/maze/LICENSE b/community/maze/LICENSE new file mode 100644 index 0000000..1326e36 --- /dev/null +++ b/community/maze/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2017 stephen + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/community/maze/README.md b/community/maze/README.md new file mode 100644 index 0000000..27b344a --- /dev/null +++ b/community/maze/README.md @@ -0,0 +1,19 @@ +# Maze generator in Go + +Created by [Stephen Chavez](https://github.com/redragonx) + +This uses the game engine: Pixel. Install it here: https://github.com/faiface/pixel + +I made this to improve my understanding of Go and some game concepts with some basic maze generating algorithms. + +Controls: Press 'R' to restart the maze. + +Optional command-line arguments: `go run ./maze-generator.go` + - `-w` sets the maze's width in pixels. + - `-h` sets the maze's height in pixels. + - `-c` sets the maze cell's size in pixels. + +Code based on the Recursive backtracker algorithm. +- https://en.wikipedia.org/wiki/Maze_generation_algorithm#Recursive_backtracker + +![Screenshot](screenshot.png) \ No newline at end of file diff --git a/community/maze/maze-generator.go b/community/maze/maze-generator.go new file mode 100644 index 0000000..a8b09f8 --- /dev/null +++ b/community/maze/maze-generator.go @@ -0,0 +1,317 @@ +package main + +// Code based on the Recursive backtracker algorithm. +// https://en.wikipedia.org/wiki/Maze_generation_algorithm#Recursive_backtracker +// See https://youtu.be/HyK_Q5rrcr4 as an example +// YouTube example ported to Go for the Pixel library. + +// Created by Stephen Chavez + +import ( + "crypto/rand" + "errors" + "flag" + "fmt" + "math/big" + "time" + + "github.com/faiface/pixel" + "github.com/faiface/pixel/examples/community/maze/stack" + "github.com/faiface/pixel/imdraw" + "github.com/faiface/pixel/pixelgl" + + "github.com/pkg/profile" + "golang.org/x/image/colornames" +) + +var visitedColor = pixel.RGB(0.5, 0, 1).Mul(pixel.Alpha(0.35)) +var hightlightColor = pixel.RGB(0.3, 0, 0).Mul(pixel.Alpha(0.45)) +var debug = false + +type cell struct { + walls [4]bool // Wall order: top, right, bottom, left + + row int + col int + visited bool +} + +func (c *cell) Draw(imd *imdraw.IMDraw, wallSize int) { + drawCol := c.col * wallSize // x + drawRow := c.row * wallSize // y + + imd.Color = colornames.White + if c.walls[0] { + // top line + imd.Push(pixel.V(float64(drawCol), float64(drawRow)), pixel.V(float64(drawCol+wallSize), float64(drawRow))) + imd.Line(3) + } + if c.walls[1] { + // right Line + imd.Push(pixel.V(float64(drawCol+wallSize), float64(drawRow)), pixel.V(float64(drawCol+wallSize), float64(drawRow+wallSize))) + imd.Line(3) + } + if c.walls[2] { + // bottom line + imd.Push(pixel.V(float64(drawCol+wallSize), float64(drawRow+wallSize)), pixel.V(float64(drawCol), float64(drawRow+wallSize))) + imd.Line(3) + } + if c.walls[3] { + // left line + imd.Push(pixel.V(float64(drawCol), float64(drawRow+wallSize)), pixel.V(float64(drawCol), float64(drawRow))) + imd.Line(3) + } + imd.EndShape = imdraw.SharpEndShape + + if c.visited { + imd.Color = visitedColor + imd.Push(pixel.V(float64(drawCol), (float64(drawRow))), pixel.V(float64(drawCol+wallSize), float64(drawRow+wallSize))) + imd.Rectangle(0) + } +} + +func (c *cell) GetNeighbors(grid []*cell, cols int, rows int) ([]*cell, error) { + neighbors := []*cell{} + j := c.row + i := c.col + + top, _ := getCellAt(i, j-1, cols, rows, grid) + right, _ := getCellAt(i+1, j, cols, rows, grid) + bottom, _ := getCellAt(i, j+1, cols, rows, grid) + left, _ := getCellAt(i-1, j, cols, rows, grid) + + if top != nil && !top.visited { + neighbors = append(neighbors, top) + } + if right != nil && !right.visited { + neighbors = append(neighbors, right) + } + if bottom != nil && !bottom.visited { + neighbors = append(neighbors, bottom) + } + if left != nil && !left.visited { + neighbors = append(neighbors, left) + } + + if len(neighbors) == 0 { + return nil, errors.New("We checked all cells...") + } + return neighbors, nil +} + +func (c *cell) GetRandomNeighbor(grid []*cell, cols int, rows int) (*cell, error) { + neighbors, err := c.GetNeighbors(grid, cols, rows) + if neighbors == nil { + return nil, err + } + nBig, err := rand.Int(rand.Reader, big.NewInt(int64(len(neighbors)))) + if err != nil { + panic(err) + } + randomIndex := nBig.Int64() + return neighbors[randomIndex], nil +} + +func (c *cell) hightlight(imd *imdraw.IMDraw, wallSize int) { + x := c.col * wallSize + y := c.row * wallSize + + imd.Color = hightlightColor + imd.Push(pixel.V(float64(x), float64(y)), pixel.V(float64(x+wallSize), float64(y+wallSize))) + imd.Rectangle(0) +} + +func newCell(col int, row int) *cell { + newCell := new(cell) + newCell.row = row + newCell.col = col + + for i := range newCell.walls { + newCell.walls[i] = true + } + return newCell +} + +// Creates the inital maze slice for use. +func initGrid(cols, rows int) []*cell { + grid := []*cell{} + for j := 0; j < rows; j++ { + for i := 0; i < cols; i++ { + newCell := newCell(i, j) + grid = append(grid, newCell) + } + } + return grid +} + +func setupMaze(cols, rows int) ([]*cell, *stack.Stack, *cell) { + // Make an empty grid + grid := initGrid(cols, rows) + backTrackStack := stack.NewStack(len(grid)) + currentCell := grid[0] + + return grid, backTrackStack, currentCell +} + +func cellIndex(i, j, cols, rows int) int { + if i < 0 || j < 0 || i > cols-1 || j > rows-1 { + return -1 + } + return i + j*cols +} + +func getCellAt(i int, j int, cols int, rows int, grid []*cell) (*cell, error) { + possibleIndex := cellIndex(i, j, cols, rows) + + if possibleIndex == -1 { + return nil, fmt.Errorf("cellIndex: CellIndex is a negative number %d", possibleIndex) + } + return grid[possibleIndex], nil +} + +func removeWalls(a *cell, b *cell) { + x := a.col - b.col + + if x == 1 { + a.walls[3] = false + b.walls[1] = false + } else if x == -1 { + a.walls[1] = false + b.walls[3] = false + } + + y := a.row - b.row + + if y == 1 { + a.walls[0] = false + b.walls[2] = false + } else if y == -1 { + a.walls[2] = false + b.walls[0] = false + } +} + +func run() { + // unsiged integers, because easier parsing error checks. + // We must convert these to intergers, as done below... + uScreenWidth, uScreenHeight, uWallSize := parseArgs() + + var ( + // In pixels + // Defualt is 800x800x40 = 20x20 wallgrid + screenWidth = int(uScreenWidth) + screenHeight = int(uScreenHeight) + wallSize = int(uWallSize) + + frames = 0 + second = time.Tick(time.Second) + + grid = []*cell{} + cols = screenWidth / wallSize + rows = screenHeight / wallSize + currentCell = new(cell) + backTrackStack = stack.NewStack(1) + ) + + // Set game FPS manually + fps := time.Tick(time.Second / 60) + + cfg := pixelgl.WindowConfig{ + Title: "Pixel Rocks! - Maze example", + Bounds: pixel.R(0, 0, float64(screenHeight), float64(screenWidth)), + } + + win, err := pixelgl.NewWindow(cfg) + if err != nil { + panic(err) + } + + grid, backTrackStack, currentCell = setupMaze(cols, rows) + + gridIMDraw := imdraw.New(nil) + + for !win.Closed() { + if win.JustReleased(pixelgl.KeyR) { + fmt.Println("R pressed") + grid, backTrackStack, currentCell = setupMaze(cols, rows) + } + + win.Clear(colornames.Gray) + gridIMDraw.Clear() + + for i := range grid { + grid[i].Draw(gridIMDraw, wallSize) + } + + // step 1 + // Make the initial cell the current cell and mark it as visited + currentCell.visited = true + currentCell.hightlight(gridIMDraw, wallSize) + + // step 2.1 + // If the current cell has any neighbours which have not been visited + // Choose a random unvisited cell + nextCell, _ := currentCell.GetRandomNeighbor(grid, cols, rows) + if nextCell != nil && !nextCell.visited { + // step 2.2 + // Push the current cell to the stack + backTrackStack.Push(currentCell) + + // step 2.3 + // Remove the wall between the current cell and the chosen cell + + removeWalls(currentCell, nextCell) + + // step 2.4 + // Make the chosen cell the current cell and mark it as visited + nextCell.visited = true + currentCell = nextCell + } else if backTrackStack.Len() > 0 { + currentCell = backTrackStack.Pop().(*cell) + } + + gridIMDraw.Draw(win) + win.Update() + <-fps + updateFPSDisplay(win, &cfg, &frames, grid, second) + } +} + +// Parses the maze arguments, all of them are optional. +// Uses uint as implicit error checking :) +func parseArgs() (uint, uint, uint) { + var mazeWidthPtr = flag.Uint("w", 800, "w sets the maze's width in pixels.") + var mazeHeightPtr = flag.Uint("h", 800, "h sets the maze's height in pixels.") + var wallSizePtr = flag.Uint("c", 40, "c sets the maze cell's size in pixels.") + + flag.Parse() + + // If these aren't default values AND if they're not the same values. + // We should warn the user that the maze will look funny. + if *mazeWidthPtr != 800 || *mazeHeightPtr != 800 { + if *mazeWidthPtr != *mazeHeightPtr { + fmt.Printf("WARNING: maze width: %d and maze height: %d don't match. \n", *mazeWidthPtr, *mazeHeightPtr) + fmt.Println("Maze will look funny because the maze size is bond to the window size!") + } + } + + return *mazeWidthPtr, *mazeHeightPtr, *wallSizePtr +} + +func updateFPSDisplay(win *pixelgl.Window, cfg *pixelgl.WindowConfig, frames *int, grid []*cell, second <-chan time.Time) { + *frames++ + select { + case <-second: + win.SetTitle(fmt.Sprintf("%s | FPS: %d with %d Cells", cfg.Title, *frames, len(grid))) + *frames = 0 + default: + } + +} + +func main() { + if debug { + defer profile.Start().Stop() + } + pixelgl.Run(run) +} 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s.size++ +} + +// Remove the top element from the stack and return it's value +// If the stack is empty, return nil +func (s *Stack) Pop() (value interface{}) { + if s.size > 0 { + value, s.top = s.top.value, s.top.next + s.size-- + return + } + return nil +} + +func (s *Stack) PopLast() (value interface{}) { + if lastElem := s.popLast(s.top); lastElem != nil { + return lastElem.value + } + return nil +} + +//Peek returns a top without removing it from list +func (s *Stack) Peek() (value interface{}, exists bool) { + exists = false + if s.size > 0 { + value = s.top.value + exists = true + } + + return +} + +func (s *Stack) popLast(elem *Element) *Element { + if elem == nil { + return nil + } + // not last because it has next and a grandchild + if elem.next != nil && elem.next.next != nil { + return s.popLast(elem.next) + } + + // current elem is second from bottom, as next elem has no child + if elem.next != nil && elem.next.next == nil { + last := elem.next + // make current elem bottom of stack by removing its next element + elem.next = nil + s.size-- + return last + } + return nil +}