doodle/pkg/wallpaper/wallpaper.go
Noah Petherbridge 8965a7d86a Doodads: Crumbly Floor, Start Flag & State Blocks
Add new doodads:

* Start Flag: place this in a level to set the spawn point of the player
  character. If no flag is found, the player spawns at 0,0 in the top
  corner of the map. Only use one Start Flag per level, otherwise the
  player will randomly spawn at one of them.
* Crumbly Floor: a solid floor that begins to shake and then fall apart
  after a moment when a mobile character steps on it. The floor respawns
  after 5 seconds.
* State Blocks: blue and orange blocks that toggle between solid and
  pass-thru whenever a State Button is activated.
* State Button: a solid "ON/OFF" block that toggles State Blocks back
  and forth when touched. Only activates if touched on the side or bottom;
  acts as a solid floor when walked on from the top.

New features for doodad scripts:

* Actor scripts: call SetMobile(true) to mark an actor as a mobile mob
  (i.e. player character or enemy). Other doodads can check if the actor
  colliding with them IsMobile so they don't activate if placed too close
  to other (non-mobile) doodads in a level. The Blue and Red Azulians
  are the only mobile characters so far.
* Message.Broadcast allows sending a pub/sub message out to ALL doodads
  in the level, instead of only to linked doodads as Message.Publish does.
  This is used for the State Blocks to globally communicate on/off status
  without needing to link them all together manually.
2019-12-30 18:13:28 -08:00

174 lines
3.9 KiB
Go

package wallpaper
import (
"bytes"
"image"
"image/draw"
"os"
"path/filepath"
"runtime"
"strings"
"git.kirsle.net/apps/doodle/pkg/bindata"
"git.kirsle.net/go/render"
)
// Wallpaper is a repeatable background image to go behind levels.
type Wallpaper struct {
Name string
Format string // image file format
Image *image.RGBA
// Ready status is set to true if the wallpaper loaded itself properly.
// Notably in WASM, wallpapers don't load currently.
ready bool
// Parsed values.
quarterWidth int
quarterHeight int
// The four parsed images.
corner *image.RGBA // Top Left corner
top *image.RGBA // Top repeating
left *image.RGBA // Left repeating
repeat *image.RGBA // Main repeating
// Cached textures.
tex struct {
corner render.Texturer
top render.Texturer
left render.Texturer
repeat render.Texturer
}
}
// FromImage creates a Wallpaper from an image.Image.
// If the renger.Engine is nil it will compute images but not pre-cache any
// textures yet.
func FromImage(e render.Engine, img *image.RGBA, name string) (*Wallpaper, error) {
wp := &Wallpaper{
Name: name,
Image: img,
}
wp.cache(e)
return wp, nil
}
// FromFile creates a Wallpaper from a file on disk.
// If the renger.Engine is nil it will compute images but not pre-cache any
// textures yet.
func FromFile(e render.Engine, filename string) (*Wallpaper, error) {
// WASM: no support yet for wallpapers.
if runtime.GOOS == "js" {
return &Wallpaper{
Name: strings.Split(filepath.Base(filename), ".")[0],
ready: false,
}, nil
}
// Try and get an image object by any means.
var (
img image.Image
format string
imgErr error
)
// Try the bindata store.
if data, err := bindata.Asset(filename); err == nil {
fh := bytes.NewBuffer(data)
img, format, imgErr = image.Decode(fh)
} else {
fh, err := os.Open(filename)
if err != nil {
return nil, err
}
img, format, imgErr = image.Decode(fh)
}
// Image loading error?
if imgErr != nil {
return nil, imgErr
}
// Ugly hack: make it an image.RGBA because the thing we get tends to be
// an image.Paletted, UGH!
var b = img.Bounds()
rgba := image.NewRGBA(b)
for x := b.Min.X; x < b.Max.X; x++ {
for y := b.Min.Y; y < b.Max.Y; y++ {
rgba.Set(x, y, img.At(x, y))
}
}
wp := &Wallpaper{
Name: strings.Split(filepath.Base(filename), ".")[0],
Format: format,
Image: rgba,
ready: true,
}
wp.cache(e)
return wp, nil
}
// cache the bitmap images.
func (wp *Wallpaper) cache(e render.Engine) {
// Zero-bound the rect cuz an image.Rect doesn't necessarily contain 0,0
var rect = wp.Image.Bounds()
if rect.Min.X < 0 {
rect.Max.X += rect.Min.X
rect.Min.X = 0
}
if rect.Min.Y < 0 {
rect.Max.Y += rect.Min.Y
rect.Min.Y = 0
}
// Our quarter rect size.
wp.quarterWidth = int(float64((rect.Max.X - rect.Min.X) / 2))
wp.quarterHeight = int(float64((rect.Max.Y - rect.Min.Y) / 2))
quarter := image.Rect(0, 0, wp.quarterWidth, wp.quarterHeight)
// Slice the image into the four corners.
slice := func(dx, dy int) *image.RGBA {
slice := image.NewRGBA(quarter)
draw.Draw(
slice,
image.Rect(0, 0, wp.quarterWidth, wp.quarterHeight),
wp.Image,
image.Point{dx, dy},
draw.Over,
)
return slice
}
wp.corner = slice(0, 0)
wp.top = slice(wp.quarterWidth, 0)
wp.left = slice(0, wp.quarterHeight)
wp.repeat = slice(wp.quarterWidth, wp.quarterHeight)
}
// QuarterSize returns the width and height of the quarter images.
func (wp *Wallpaper) QuarterSize() (int, int) {
return wp.quarterWidth, wp.quarterHeight
}
// Corner returns the top left corner image.
func (wp *Wallpaper) Corner() *image.RGBA {
return wp.corner
}
// Top returns the top repeating image.
func (wp *Wallpaper) Top() *image.RGBA {
return wp.top
}
// Left returns the left repeating image.
func (wp *Wallpaper) Left() *image.RGBA {
return wp.left
}
// Repeat returns the main repeating image.
func (wp *Wallpaper) Repeat() *image.RGBA {
return wp.repeat
}