Some initial pixel drawing with the mouse
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8c884d4cab
commit
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2
Makefile
2
Makefile
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@ -31,4 +31,4 @@ test:
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# `make clean` cleans everything up.
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.PHONY: clean
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clean:
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rm -rf bin dist
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rm -rf bin dist
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@ -2,6 +2,7 @@ package main
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import (
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"flag"
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"runtime"
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"github.com/kirsle/doodle"
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)
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@ -19,8 +20,9 @@ func init() {
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}
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func main() {
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runtime.LockOSThread()
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flag.Parse()
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app := doodle.New(debug)
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_ = app
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app.Run()
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}
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211
doodle.go
211
doodle.go
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@ -1,6 +1,10 @@
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package doodle
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import "github.com/veandco/go-sdl2/sdl"
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import (
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"fmt"
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"github.com/veandco/go-sdl2/sdl"
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)
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// Version number.
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const Version = "0.0.0-alpha"
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@ -9,19 +13,44 @@ const Version = "0.0.0-alpha"
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type Doodle struct {
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Debug bool
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running bool
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events EventState
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width int
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height int
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window *sdl.Window
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surface *sdl.Surface
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renderer *sdl.Renderer
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}
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// EventState keeps track of important events.
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type EventState struct {
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CursorX int32
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CursorY int32
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LastX int32
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LastY int32
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LeftClick bool
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LastLeft bool
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RightClick bool
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LastRight bool
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}
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// New initializes the game object.
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func New(debug bool) *Doodle {
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d := &Doodle{
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Debug: debug,
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Debug: debug,
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running: true,
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width: 800,
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height: 600,
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}
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return d
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}
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// Run initializes SDL and starts the main loop.
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func (d *Doodle) Run() error {
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// Initialize SDL.
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if err := sdl.Init(sdl.INIT_EVERYTHING); err != nil {
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panic(err)
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return err
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}
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defer sdl.Quit()
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@ -30,30 +59,186 @@ func New(debug bool) *Doodle {
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"Doodle v"+Version,
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sdl.WINDOWPOS_CENTERED,
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sdl.WINDOWPOS_CENTERED,
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800,
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600,
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d.width,
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d.height,
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sdl.WINDOW_SHOWN,
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)
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if err != nil {
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panic(err)
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return err
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}
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defer window.Destroy()
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d.window = window
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surface, err := window.GetSurface()
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// Blank out the window in white.
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renderer, err := sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
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if err != nil {
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panic(err)
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}
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d.renderer = renderer
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defer renderer.Destroy()
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for i := 0; i < 10; i++ {
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d.Loop()
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// renderer.Clear()
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// rect := sdl.Rect{
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// X: 0,
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// Y: 0,
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// W: 800,
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// H: 600,
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// }
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// renderer.SetDrawColor(0, 0, 0, 255)
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// renderer.FillRect(&rect)
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//
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// renderer.SetDrawColor(0, 255, 0, 255)
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// renderer.DrawPoint(10*i, 10*i)
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//
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// renderer.Present()
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//
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// sdl.Delay(250)
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}
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for d.running {
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err = d.Loop()
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if err != nil {
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return err
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}
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}
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// surface, err := window.GetSurface()
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// if err != nil {
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// panic(err)
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// }
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// d.surface = surface
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//
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// rect := sdl.Rect{
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// X: 0,
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// Y: 0,
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// W: 200,
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// H: 200,
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// }
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// surface.FillRect(&rect, 0xffff0000)
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// window.UpdateSurface()
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//
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// sdl.Delay(2500)
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return nil
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}
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// TODO: not a global
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type Pixel struct {
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start bool
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x int32
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y int32
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}
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var pixelHistory []Pixel
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// Loop runs one loop of the game engine.
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func (d *Doodle) Loop() error {
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// Poll for events.
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d.PollEvents()
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d.renderer.Clear()
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rect := sdl.Rect{
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X: 0,
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Y: 0,
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W: 200,
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H: 200,
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W: 800,
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H: 600,
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}
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surface.FillRect(&rect, 0xffff0000)
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window.UpdateSurface()
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d.renderer.SetDrawColor(255, 255, 255, 255)
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d.renderer.FillRect(&rect)
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sdl.Delay(2500)
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// Clicking? Log all the pixels while doing so.
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if d.events.LeftClick {
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fmt.Printf("Pixel at %dx%d\n", d.events.CursorX, d.events.CursorY)
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pixel := Pixel{
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start: d.events.LeftClick && !d.events.LastLeft,
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x: d.events.CursorX,
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y: d.events.CursorY,
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}
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pixelHistory = append(pixelHistory, pixel)
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}
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return d
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// Colorize all those pixels.
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d.renderer.SetDrawColor(0, 0, 0, 255)
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for i, pixel := range pixelHistory {
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fmt.Printf("Draw: %v\n", pixel)
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if pixel.start == false && i > 0 {
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start := pixelHistory[i-1]
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fmt.Printf("Line from %dx%d -> %dx%d\n", start.x, start.y, pixel.x, pixel.y)
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d.renderer.DrawLine(
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int(start.x),
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int(start.y),
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int(pixel.x),
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int(pixel.y),
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)
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} else {
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d.renderer.DrawPoint(
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int(pixel.x), int(pixel.y),
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)
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}
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// d.renderer.FillRect(&sdl.Rect{pixel.x, pixel.y, 10, 10})
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}
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d.renderer.Present()
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sdl.Delay(1000 / 60)
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return nil
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}
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// PollEvents checks for keyboard/mouse/etc. events.
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func (d *Doodle) PollEvents() {
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for {
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event := sdl.PollEvent()
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if event == nil {
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break
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}
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// Handle the event.
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switch t := event.(type) {
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case *sdl.QuitEvent:
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d.running = false
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case *sdl.MouseMotionEvent:
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fmt.Printf("[%d ms] MouseMotion type:%d id:%d x:%d y:%d xrel:%d yrel:%d\n",
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t.Timestamp, t.Type, t.Which, t.X, t.Y, t.XRel, t.YRel,
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)
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d.events.LastX = d.events.CursorX
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d.events.LastY = d.events.CursorY
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d.events.CursorX = t.X
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d.events.CursorY = t.Y
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case *sdl.MouseButtonEvent:
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fmt.Printf("[%d ms] MouseButton type:%d id:%d x:%d y:%d button:%d state:%d\n",
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t.Timestamp, t.Type, t.Which, t.X, t.Y, t.Button, t.State,
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)
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d.events.LastX = d.events.CursorX
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d.events.LastY = d.events.CursorY
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d.events.CursorX = t.X
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d.events.CursorY = t.Y
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d.events.LastLeft = d.events.LeftClick
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d.events.LastRight = d.events.RightClick
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// Clicking?
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if t.Button == 1 {
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if t.State == 1 && d.events.LeftClick == false {
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d.events.LeftClick = true
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} else if t.State == 0 && d.events.LeftClick == true {
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d.events.LeftClick = false
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}
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}
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d.events.RightClick = t.Button == 3 && t.State == 1
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case *sdl.MouseWheelEvent:
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fmt.Printf("[%d ms] MouseWheel type:%d id:%d x:%d y:%d\n",
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t.Timestamp, t.Type, t.Which, t.X, t.Y,
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)
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case *sdl.KeyDownEvent:
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fmt.Printf("[%d ms] Keyboard type:%d sym:%c modifiers:%d state:%d repeat:%d\n",
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t.Timestamp, t.Type, t.Keysym.Sym, t.Keysym.Mod, t.State, t.Repeat,
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)
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case *sdl.KeyUpEvent:
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fmt.Printf("[%d ms] Keyboard type:%d sym:%c modifiers:%d state:%d repeat:%d\n",
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t.Timestamp, t.Type, t.Keysym.Sym, t.Keysym.Mod, t.State, t.Repeat,
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)
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}
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}
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}
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