automated snapshot

main.go

@@ -13,50 +13,17 @@ import (
 )
 
 const (
-	screenWidth  = 800
+	targetWidth  = 800
-	screenHeight = 600
+	targetHeight = 600
-	sourceWidth  = 10000
+	sourceScale  = 1
-	sourceHeight = 10000
-	displayScale = 2
 	snapshotsDir = "snapshots"
 )
 
-func main3() {
-	rl.InitWindow(800, 600, "rt test")
-	defer rl.CloseWindow()
-
-	rt := rl.LoadRenderTexture(512, 512)
-	defer rl.UnloadRenderTexture(rt)
-
-	for !rl.WindowShouldClose() {
-		// draw into offscreen buffer
-		rl.BeginTextureMode(rt)
-		rl.ClearBackground(rl.Blank)
-		rl.DrawCircle(256, 256, 100, rl.Red)
-		rl.EndTextureMode()
-
-		// draw to screen
-		rl.BeginDrawing()
-		rl.ClearBackground(rl.RayWhite)
-
-		src := rl.Rectangle{
-			X: 0, Y: 0,
-			Width:  float32(rt.Texture.Width),
-			Height: -float32(rt.Texture.Height),
-		}
-		dst := rl.Rectangle{
-			X: 0, Y: 0,
-			Width:  800,
-			Height: 600,
-		}
-
-		rl.DrawTexturePro(rt.Texture, src, dst, rl.Vector2{}, 0, rl.White)
-		rl.EndDrawing()
-	}
-}
-
 func main() {
 
+	sourceWidth  := sourceScale * targetWidth
+	sourceHeight := sourceScale * targetHeight
+
 	os.MkdirAll(snapshotsDir, 0755)
 	log := log.New(os.Stdout, "", log.Ldate|log.Ltime|log.Lshortfile)
 	storage, err := NewStorage(snapshotsDir)
@@ -64,22 +31,22 @@ func main() {
 		log.Printf("Error loading storage: %v\n", err)
 		os.Exit(1)
 	}
-	rl.SetConfigFlags(rl.FlagWindowHighdpi)
+
-	rl.InitWindow(screenWidth, screenHeight, "sumi sierpinski arrow")
+	rl.SetConfigFlags(rl.FlagWindowHighdpi & rl.FlagMsaa4xHint)
+	rl.InitWindow(targetWidth, targetHeight, "sumi sierpinski arrow")
 
 	log.Printf("screen=%dx%d render=%dx%d",
 		rl.GetScreenWidth(), rl.GetScreenHeight(),
 		rl.GetRenderWidth(), rl.GetRenderHeight(),
 	)
 
-	w := rl.GetRenderWidth()
+	// point at source center
-	h := rl.GetRenderHeight()
+	// put source center at center of screen
-
 	var camera = rl.Camera2D {
-		Target:   rl.Vector2{X: 0, Y: 0},
+		Target:   rl.Vector2{X: float32(targetWidth) / 2, Y: float32(targetHeight) / 2},
-		Offset:   rl.Vector2{X: float32(w) / 2, Y: float32(h) / 2},
+		Offset:   rl.Vector2{},
-		Rotation: 0,
 		Zoom:     1.0,
+		Rotation: 0,
 	}
 
 	/*
@@ -90,9 +57,7 @@ func main() {
 						Noise: opensimplex.NewNormalized32(0),
 					},
 				}
-
 		imgf := NewImageField("/home/d/Dropbox/art/passage/data/david.png")
-
 		imageField :=
 			ScaleField{
 				field: &imgf,
@@ -105,7 +70,7 @@ func main() {
 	//contourSketch := NewContourLayer(rng, &imageField)
 
 	sketch := NewSketch()
-	sketch.CreateLayer("testPattern", &TestPattern{}, sourceWidth, sourceHeight)
+	sketch.CreateLayer("testPattern", &TestPattern{}, int32(sourceWidth), int32(sourceHeight))
 
 	rl.SetTargetFPS(60)
 
@@ -127,8 +92,8 @@ func main() {
 
 		// set up RenderCtx
 		renderCtx := &RenderCtx{
-			TargetWidth:  int32(w),
+			TargetWidth:  int32(targetWidth),
-			TargetHeight: int32(h),
+			TargetHeight: int32(targetHeight),
 			SourceWidth:  int32(sourceWidth),
 			SourceHeight: int32(sourceHeight),
 			Time:         t,
@@ -142,14 +107,11 @@ func main() {
 		rl.BeginDrawing()
 		rl.ClearBackground(rl.Blank)
 
-		//rl.PushMatrix()
 		sketch.Draw(renderCtx)
 
 		rl.DrawText("Mouse right button drag to move, mouse wheel to zoom", 10, 10, 20, rl.White)
-		//rl.PopMatrix()
 
 		rl.EndDrawing()
-		//rl.DrawCircle(0, 0, 10, rl.Green)
 
 		if rl.IsKeyDown(rl.KeySpace) {
 			if _, err := storage.Save(); err != nil {
@@ -243,6 +205,7 @@ func updateCamera(camera *rl.Camera2D) {
 		delta := rl.GetMouseDelta()
 		// compute the amount to move scaled by the camera zoom
 		delta = rl.Vector2Scale(delta, -1.0/camera.Zoom)
+		delta.Y = -delta.Y
 		camera.Target = rl.Vector2Add(camera.Target, delta)
 	}
 	// Zoom based on mouse wheel

sketch.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"github.com/gen2brain/raylib-go/raylib"
 )
 
@@ -23,27 +24,55 @@ func (s *Sketch) CreateLayer(name string, layer Layer, sourceWidth int32, source
 	}
 }
 
+func LayerViewRect(ctx *RenderCtx) rl.Rectangle {
+
+	z := ctx.Cam.Zoom
+
+	// get the viewport width in texture space
+	viewportWidth  := float32(ctx.TargetWidth) / z
+	viewportHeight := float32(ctx.TargetHeight) / z
+
+	x := rl.Clamp(ctx.Cam.Target.X - viewportWidth/2, 0, float32(ctx.SourceWidth) - viewportWidth/2.0)
+	y := rl.Clamp(ctx.Cam.Target.Y - viewportHeight/2, 0, float32(ctx.SourceHeight) - viewportHeight/2.0)
+
+	return rl.Rectangle{
+		X: x,
+		Y: y,
+		Width:  viewportWidth,
+		Height: viewportHeight,
+	}
+}
+
 func (s *Sketch) Draw(ctx *RenderCtx) {
 	// render onto all layer textures
 	for _, instance := range s.layerTools {
 		layer := instance.layer
 		rl.BeginTextureMode(*instance.texture)
+		rl.ClearBackground(rl.Blank)
 		layer.Draw(ctx)
 		rl.EndTextureMode()
 	}
 	// composite all layers to screen
 
+	//ClampCameraToLayer(ctx)
+
+	//view := LayerViewRect(ctx)
 	src := rl.Rectangle {
-		X: 0, Y: 0,
+		X: 0,
+		Y: 0,
 		Width: float32(ctx.SourceWidth),
 		Height: -float32(ctx.SourceHeight),
 	}
+
 	dst := rl.Rectangle {
-		X: 0, Y: 0,
+		X: 0,
+		Y: 0,
 		Width: float32(ctx.TargetWidth),
 		Height: float32(ctx.TargetHeight),
 	}
 
+	fmt.Printf("src = %v, dst  %v\n", src, dst)
+
 	for _, instance := range s.layerTools {
 		rl.DrawTexturePro(instance.texture.Texture, src, dst, rl.Vector2{}, 0, rl.White)
 	}
@@ -56,7 +85,6 @@ type LayerTools struct {
 	texture *rl.RenderTexture2D
 }
 
-
 /** Layer **/
 
 type Layer interface {
@@ -65,11 +93,36 @@ type Layer interface {
 
 type TestPattern struct { }
 
+func DrawGrid(spacing int32, halfExtent int32) {
+	col := rl.Color{R: 220, G: 220, B: 220, A: 255}
+
+	for x := -halfExtent; x <= halfExtent; x += spacing {
+		rl.DrawLine(x, -halfExtent, x, halfExtent, col)
+	}
+	for y := -halfExtent; y <= halfExtent; y += spacing {
+		rl.DrawLine(-halfExtent, y, halfExtent, y, col)
+	}
+}
+
 func (tp *TestPattern) Draw(ctx *RenderCtx) {
-	rl.DrawRectangle(0, 0, int32(ctx.SourceWidth), int32(ctx.SourceHeight), rl.Magenta)
+
+	rl.ClearBackground(rl.Black)
+	centerX := float32(ctx.SourceWidth)/2
+	centerY := float32(ctx.SourceHeight)/2
+
+	rl.DrawRectangleRec(rl.Rectangle { X: 0, Y: 0, Width: centerX, Height: centerY }, rl.Red)
+	rl.DrawRectangleRec(rl.Rectangle { X: centerX, Y: 0, Width: centerX, Height: centerY }, rl.Green)
+	rl.DrawRectangleRec(rl.Rectangle { X: 0, Y: centerY, Width: centerX, Height: centerY }, rl.Blue)
+	rl.DrawRectangleRec(rl.Rectangle { X: centerX, Y: centerY, Width: centerX, Height: centerY }, rl.White)
+
+	rl.DrawLine(0, 0, ctx.SourceWidth, ctx.SourceHeight, rl.Black)
+
 	rl.PushMatrix()
-	rl.Translatef(float32(ctx.SourceWidth)/2.0, float32(ctx.SourceHeight)/2.0, 0.0)
+	rl.Translatef(centerX, centerY, 0)
-	rl.DrawRectangle(-100, -100, 200, 200, rl.Green)
+	rl.SetLineWidth(4.0)
+	rl.DrawLine(-10000, 0, 10000, 0, rl.Red)
+	rl.DrawLine(0, -10000, 0, 10000, rl.Green)
+	rl.DrawRectangleLines(-50, -50, 100, 100, rl.Magenta)
 	rl.PopMatrix()
 }