making moves

animationMario.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"log"
+	"os"
+
+	"github.com/disintegration/imaging"
+)
+
+type Mario struct {
+	position image.Point
+	dir      image.Point
+	images   map[string]image.Image
+	updown   string
+}
+
+// animator is a wrapping function for go routine that can receive an mq channel
+func initialMario() Mario {
+	mario := Mario{
+		images: initialMap(),
+		updown: "marioUp",
+		dir:    image.Point{1, 1},
+	}
+	return mario
+}
+func loadMario(file string) image.Image {
+
+	reader, err := os.Open(file)
+	if err != nil {
+		log.Fatal(err)
+	}
+	rawMario, _, err := image.Decode(reader)
+	if err != nil {
+		log.Fatal(err)
+	}
+	mario := imaging.Resize(rawMario, 16, 16, imaging.Lanczos)
+	return mario
+}
+
+func initialMap() map[string]image.Image {
+	imageMap := make(map[string]image.Image)
+	imageMap["marioUp"] = loadMario("marioUp.png")
+	imageMap["marioDown"] = loadMario("marioDown.png")
+	return imageMap
+}
+
+// initializes the struct for the an play animation function, this could all be dumped into function that's wrapping go routine if I wanted
+
+// what happens each frame, at an interval of 50 milliseconds
+
+func (a *Animation) animateMario() {
+	defer a.updateMarioPosition()
+	a.ctx.SetColor(color.Black)
+	a.ctx.Clear()
+	if a.dir.X == 1 {
+		a.ctx.DrawImageAnchored(a.mario.images[a.mario.updown], a.mario.position.X, a.mario.position.Y, 0.5, 0.5)
+	} else {
+		a.ctx.DrawImageAnchored(imaging.FlipH(a.mario.images[a.mario.updown]), a.mario.position.X, a.mario.position.Y, 0.5, 0.5)
+	}
+}
+
+// what mario does every frame
+func (a *Animation) updateMarioPosition() {
+	a.mario.position.X += 1 * a.mario.dir.X
+	a.mario.position.Y += 1 * a.mario.dir.Y
+
+	if a.mario.position.Y+a.height > a.ctx.Height() {
+		a.mario.dir.Y = -1
+		a.mario.updown = "marioUp"
+	} else if a.position.Y-a.height < 0 {
+		a.mario.updown = "marioDown"
+		a.mario.dir.Y = 1
+	}
+
+	if a.mario.position.X+a.width > a.ctx.Width() {
+		a.mario.dir.X = -1
+	} else if a.mario.position.X-a.width < 0 {
+		a.mario.dir.X = 1
+	}
+}