Link program block parameters bidirectionally and add parameter link UI

src/main/kotlin/net/shadowfacts/asmr/manager/ManagerBlockEntity.kt

@@ -25,17 +25,17 @@ class ManagerBlockEntity: BlockEntity(ASMR.managerEntityType) {
 			it.position = Point(0.0, 120.0)
 		}
 		val divide = program.addBlock(BinaryOperatorBlock(INT, DIVIDE)) {
-			it.left.source = left.output
-			it.right.source = right.output
+			it.left.link(from = left.output)
+			it.right.link(from = right.output)
 			it.position = Point(120.0, 0.0)
 		}
 		val print = program.addBlock(PrintBlock(INT)) {
-			it.input.source = divide.output
+			it.input.link(from = divide.output)
 			it.position = Point(240.0, 0.0)
 		}
 
-		program.startBlock.nextExecutableBlock = divide
-		divide.nextExecutableBlock = print
+		program.startBlock.executionFlow.link(divide)
+		divide.executionFlow.link(print)
 	}
 
 	fun activate() {

src/main/kotlin/net/shadowfacts/asmr/program/ExecutableBlock.kt

@@ -1,13 +1,11 @@
 package net.shadowfacts.asmr.program
 
-import net.shadowfacts.cacao.geometry.Point
-
 /**
  * @author shadowfacts
  */
 abstract class ExecutableBlock: ProgramBlock() {
 
-	var nextExecutableBlock: ExecutableBlock? = null
+	open val executionFlow = ExecutionFlow(this)
 
 	abstract fun execute()
 

src/main/kotlin/net/shadowfacts/asmr/program/ExecutionFlow.kt

@@ -0,0 +1,16 @@
+package net.shadowfacts.asmr.program
+
+/**
+ * @author shadowfacts
+ */
+open class ExecutionFlow(val block: ExecutableBlock) {
+
+	open var next: ExecutableBlock? = null
+	open var prev: ExecutableBlock? = null
+
+	fun link(next: ExecutableBlock) {
+		this.next = next
+		next.executionFlow.prev = block
+	}
+
+}

src/main/kotlin/net/shadowfacts/asmr/program/Program.kt

@@ -11,14 +11,14 @@ class Program {
 	var startBlock = StartBlock().apply {
 		position = Point.ORIGIN
 	}
-	val blocks = mutableListOf<ProgramBlock>()
+	val blocks = mutableListOf<ProgramBlock>(startBlock)
 
 	fun execute() {
-		var currentBlock: ExecutableBlock? = startBlock.nextExecutableBlock
+		var currentBlock: ExecutableBlock? = startBlock.executionFlow.next
 		while (currentBlock != null) {
 			currentBlock.execute()
 
-			currentBlock = currentBlock.nextExecutableBlock
+			currentBlock = currentBlock.executionFlow.next
 		}
 	}
 

src/main/kotlin/net/shadowfacts/asmr/program/ProgramBlockInput.kt

@@ -1,15 +1,29 @@
 package net.shadowfacts.asmr.program
 
+import net.minecraft.util.Identifier
+
 /**
  * @author shadowfacts
  */
 class ProgramBlockInput<Type: Any>(
+		val identifier: Identifier,
 		val type: ProgramType<Type>,
 		val block: ProgramBlock,
-		var source: ProgramBlockOutput<Type>? = null
+		source: ProgramBlockOutput<Type>? = null
 ) {
 
+	var source: ProgramBlockOutput<Type>? = source
+		internal set
+
 	val value: Type?
 		get() = source?.value
 
+	fun link(from: ProgramBlockOutput<Type>) {
+		from.link(to = this)
+	}
+
+	fun unlink() {
+		source?.unlink(to = this)
+	}
+
 }

src/main/kotlin/net/shadowfacts/asmr/program/ProgramBlockOutput.kt

@@ -1,13 +1,29 @@
 package net.shadowfacts.asmr.program
 
+import net.minecraft.util.Identifier
+
 /**
  * @author shadowfacts
  */
 class ProgramBlockOutput<Type: Any>(
+		val identifier: Identifier,
 		val type: ProgramType<Type>,
 		val block: ProgramBlock
 ) {
 
 	lateinit var value: Type
 
+	private val _destinations = mutableListOf<ProgramBlockInput<Type>>()
+	val destinations: List<ProgramBlockInput<Type>> = _destinations
+
+	fun link(to: ProgramBlockInput<Type>) {
+		to.source = this
+		_destinations.add(to)
+	}
+
+	fun unlink(to: ProgramBlockInput<Type>) {
+		to.source = null
+		_destinations.remove(to)
+	}
+
 }

src/main/kotlin/net/shadowfacts/asmr/program/blocks/ConstantBlock.kt

@@ -1,5 +1,7 @@
 package net.shadowfacts.asmr.program.blocks
 
+import net.minecraft.util.Identifier
+import net.shadowfacts.asmr.ASMR
 import net.shadowfacts.asmr.program.ProgramBlock
 import net.shadowfacts.asmr.program.ProgramBlockInput
 import net.shadowfacts.asmr.program.ProgramBlockOutput
@@ -13,7 +15,7 @@ class ConstantBlock<Type: Any>(
 		val value: Type
 ): ProgramBlock() {
 
-	val output = ProgramBlockOutput(type, this).apply {
+	val output = ProgramBlockOutput(Identifier(ASMR.modid, "constant_output"), type, this).apply {
 		value = this@ConstantBlock.value
 	}
 

src/main/kotlin/net/shadowfacts/asmr/program/blocks/PrintBlock.kt

@@ -1,9 +1,8 @@
 package net.shadowfacts.asmr.program.blocks
 
-import net.shadowfacts.asmr.program.ExecutableBlock
-import net.shadowfacts.asmr.program.ProgramBlockInput
-import net.shadowfacts.asmr.program.ProgramBlockOutput
-import net.shadowfacts.asmr.program.ProgramType
+import net.minecraft.util.Identifier
+import net.shadowfacts.asmr.ASMR
+import net.shadowfacts.asmr.program.*
 import net.shadowfacts.cacao.geometry.Point
 
 /**
@@ -13,7 +12,7 @@ class PrintBlock<Type: Any>(
 		val type: ProgramType<Type>
 ): ExecutableBlock() {
 
-	val input = ProgramBlockInput(type, this)
+	val input = ProgramBlockInput(Identifier(ASMR.modid, "print_input"), type, this)
 
 	override val inputs: Array<ProgramBlockInput<*>> = arrayOf(input)
 	override val outputs: Array<ProgramBlockOutput<*>> = arrayOf()

src/main/kotlin/net/shadowfacts/asmr/program/blocks/StartBlock.kt

@@ -1,18 +1,18 @@
 package net.shadowfacts.asmr.program.blocks
 
 import net.shadowfacts.asmr.program.ExecutableBlock
-import net.shadowfacts.asmr.program.ProgramBlock
 import net.shadowfacts.asmr.program.ProgramBlockInput
 import net.shadowfacts.asmr.program.ProgramBlockOutput
 
 /**
  * @author shadowfacts
  */
-class StartBlock: ProgramBlock() {
+class StartBlock: ExecutableBlock() {
 
 	override val inputs: Array<ProgramBlockInput<*>> = arrayOf()
 	override val outputs: Array<ProgramBlockOutput<*>> = arrayOf()
 
-	var nextExecutableBlock: ExecutableBlock? = null
+	override fun execute() {
+	}
 
 }

src/main/kotlin/net/shadowfacts/asmr/program/blocks/math/BinaryOperatorBlock.kt

@@ -1,5 +1,7 @@
 package net.shadowfacts.asmr.program.blocks.math
 
+import net.minecraft.util.Identifier
+import net.shadowfacts.asmr.ASMR
 import net.shadowfacts.asmr.program.ExecutableBlock
 import net.shadowfacts.asmr.program.ProgramBlockInput
 import net.shadowfacts.asmr.program.ProgramBlockOutput
@@ -20,10 +22,10 @@ class BinaryOperatorBlock<Type: Any>(
 		}
 	}
 
-	val left = ProgramBlockInput(type, this)
-	val right = ProgramBlockInput(type, this)
+	val left = ProgramBlockInput(Identifier(ASMR.modid, "left_operand"), type, this)
+	val right = ProgramBlockInput(Identifier(ASMR.modid, "right_operand"), type, this)
 
-	val output = ProgramBlockOutput(type, this)
+	val output = ProgramBlockOutput(Identifier(ASMR.modid, "result"), type, this)
 
 	override val inputs: Array<ProgramBlockInput<*>> = arrayOf(left, right)
 	override val outputs: Array<ProgramBlockOutput<*>> = arrayOf(output)

src/main/kotlin/net/shadowfacts/asmr/ui/ProgramBlockView.kt

@@ -1,18 +1,40 @@
 package net.shadowfacts.asmr.ui
 
+import net.minecraft.util.Identifier
+import net.shadowfacts.asmr.ASMR
+import net.shadowfacts.asmr.program.ExecutableBlock
 import net.shadowfacts.asmr.program.ProgramBlock
+import net.shadowfacts.asmr.program.ProgramBlockInput
+import net.shadowfacts.asmr.program.ProgramBlockOutput
+import net.shadowfacts.cacao.geometry.Axis
 import net.shadowfacts.cacao.geometry.Point
 import net.shadowfacts.cacao.util.Color
 import net.shadowfacts.cacao.util.MouseButton
+import net.shadowfacts.cacao.util.texture.Texture
 import net.shadowfacts.cacao.view.Label
+import net.shadowfacts.cacao.view.StackView
+import net.shadowfacts.cacao.view.TextureView
 import net.shadowfacts.cacao.view.View
 import net.shadowfacts.kiwidsl.dsl
 import no.birkett.kiwi.Constraint
+import kotlin.math.max
 
 /**
  * @author shadowfacts
  */
-class ProgramBlockView(val block: ProgramBlock): View() {
+class ProgramBlockView(val block: ProgramBlock): StackView(Axis.VERTICAL, Distribution.CENTER, spacing = 4.0) {
+
+	companion object {
+		val emptyConnection = Texture(Identifier(ASMR.modid, "textures/gui/programmer/program_connections.png"), u = 0, v = 0)
+		val executionConnection = Texture(Identifier(ASMR.modid, "textures/gui/programmer/program_connections.png"), u = 7, v = 0)
+		val parameterConnection = Texture(Identifier(ASMR.modid, "textures/gui/programmer/program_connections.png"), u = 14, v = 0)
+	}
+
+	var incomingExecution: View? = null
+	var outgoingExeuction: View? = null
+
+	val inputViews = mutableMapOf<ProgramBlockInput<*>, View>()
+	val outputViews = mutableMapOf<ProgramBlockOutput<*>, View>()
 
 	var xConstraint: Constraint? = null
 	var yConstraint: Constraint? = null
@@ -25,15 +47,103 @@ class ProgramBlockView(val block: ProgramBlock): View() {
 		backgroundColor = Color.BLACK
 		zIndex = 10.0
 
-		val title = addSubview(Label(block.javaClass.simpleName))
+		val titleStack = addArrangedSubview(StackView(Axis.HORIZONTAL, Distribution.CENTER))
+		val title = titleStack.addArrangedSubview(Label(block.javaClass.simpleName))
+		if (block is ExecutableBlock) {
+			val incomingTexture = if (block.executionFlow.prev == null) emptyConnection else executionConnection
+			incomingExecution = titleStack.addArrangedSubview(TextureView(incomingTexture), index = 0)
+			val outgoingTexture = if (block.executionFlow.next == null) emptyConnection else executionConnection
+			outgoingExeuction = titleStack.addArrangedSubview(TextureView(outgoingTexture))
+		}
 
 		solver.dsl {
-			widthAnchor equalTo (title.widthAnchor + 8)
-			heightAnchor equalTo (title.heightAnchor + 8)
-			title.centerXAnchor equalTo centerXAnchor
-			title.centerYAnchor equalTo centerYAnchor
+			// we have to constrain the titleStack height, because it's distribution is set to CENTER, so it doesn't do it itself
+			titleStack.heightAnchor equalTo title.heightAnchor
+			widthAnchor greaterThanOrEqualTo titleStack.widthAnchor
+
+			if (block is ExecutableBlock) {
+				incomingExecution!!.widthAnchor equalTo incomingExecution!!.heightAnchor
+				incomingExecution!!.widthAnchor equalTo 7
+				outgoingExeuction!!.widthAnchor equalTo outgoingExeuction!!.heightAnchor
+				outgoingExeuction!!.widthAnchor equalTo 7
+			}
+
+
+//			for (paramView in inputViews.values) {
+//				paramView.widthAnchor equalTo paramView.heightAnchor
+//				paramView.widthAnchor equalTo 7
+//			}
 		}
 
+		for (i in 0 until max(block.inputs.size, block.outputs.size)) {
+			val hStack = addArrangedSubview(StackView(Axis.HORIZONTAL, Distribution.CENTER))
+
+			block.inputs.getOrNull(i)?.let { input ->
+				val inputView = hStack.addArrangedSubview(TextureView(if (input.source == null) emptyConnection else parameterConnection))
+				inputViews[input] = inputView
+				val inputLabel = hStack.addArrangedSubview(Label(input.identifier.toString()))
+				solver.dsl {
+					hStack.heightAnchor equalTo inputLabel.heightAnchor
+
+					inputView.widthAnchor equalTo inputView.heightAnchor
+					inputView.widthAnchor equalTo 7
+				}
+			}
+
+			val spacingView = hStack.addArrangedSubview(View())
+			solver.dsl {
+				spacingView.widthAnchor equalTo 8
+			}
+
+			block.outputs.getOrNull(i)?.let { output ->
+				val outputLabel = hStack.addArrangedSubview(Label(output.identifier.toString(), textAlignment = Label.TextAlignment.RIGHT))
+				val outputView = hStack.addArrangedSubview(TextureView(if (output.destinations.isEmpty()) emptyConnection else parameterConnection))
+				outputViews[output] = outputView
+				solver.dsl {
+					hStack.heightAnchor equalTo outputLabel.heightAnchor
+
+					outputView.widthAnchor equalTo outputView.heightAnchor
+					outputView.widthAnchor equalTo 7
+				}
+			}
+		}
+
+//		val pairs = block.inputs.zip(block.outputs)
+//		val remainingInputs = if (block.inputs.size > block.outputs.size) block.inputs.drop(block.outputs.size) else listOf()
+//		val remainingOutputs = if (block.outputs.size > block.inputs.size) block.outputs.drop(block.inputs.size) else listOf()
+//		for ((input, output) in pairs) {
+//			val hStack = addArrangedSubview(StackView(Axis.HORIZONTAL, Distribution.CENTER))
+//			val inputView = hStack.addArrangedSubview(TextureView(if (input.source == null) emptyConnection else parameterConnection))
+//			inputViews[input] = inputView
+//			val inputLabel = hStack.addArrangedSubview(Label(input.identifier.toString()))
+//			val spacingView = hStack.addArrangedSubview(View())
+//			hStack.addArrangedSubview(Label(output.identifier.toString()))
+////			outputViews[output] = hStack.addArrangedSubview(TextureView(if (output.destinations.isEmpty) emptyConnection else parameterConnection))
+//
+//			solver.dsl {
+//				hStack.heightAnchor equalTo inputLabel.heightAnchor
+//
+//				inputView.widthAnchor equalTo inputView.heightAnchor
+//				inputView.widthAnchor equalTo 7
+//
+//				spacingView.widthAnchor equalTo 8
+//			}
+//		}
+
+//		for (input in remainingInputs) {
+//			addArrangedSubview(Label(input.identifier.toString()))
+//		}
+//		for (output in remainingOutputs) {
+//			addArrangedSubview(Label(output.identifier.toString(), textAlignment = Label.TextAlignment.RIGHT))
+//		}
+
+		solver.dsl {
+			for (view in arrangedSubviews.drop(1)) {
+				widthAnchor.equalTo(view.widthAnchor, strength = STRONG)
+			}
+		}
+
+
 		updateDraggingConstraints()
 	}
 
@@ -53,4 +163,8 @@ class ProgramBlockView(val block: ProgramBlock): View() {
 		window!!.layout()
 	}
 
+	override fun drawContent(mouse: Point, delta: Float) {
+		super.drawContent(mouse, delta)
+	}
+
 }

src/main/kotlin/net/shadowfacts/asmr/ui/ProgramCanvasView.kt

@@ -1,5 +1,6 @@
 package net.shadowfacts.asmr.ui
 
+import net.shadowfacts.asmr.program.ExecutableBlock
 import net.shadowfacts.asmr.program.Program
 import net.shadowfacts.asmr.program.ProgramBlock
 import net.shadowfacts.cacao.geometry.Point
@@ -28,17 +29,44 @@ class ProgramCanvasView(val program: Program): View() {
 	override fun drawContent(mouse: Point, delta: Float) {
 		super.drawContent(mouse, delta)
 
-		blocks.keys.forEach { block ->
-			block.inputs
-					.filter { it.source != null }
-					.forEach { input ->
-						val start = block.position
-						val source = input.source!!
-						val sourcePosition = source.block.position
-						val end = Point(sourcePosition.x + blocks[source.block]!!.bounds.width, sourcePosition.y)
 
-						RenderHelper.drawLine(start, end, zIndex, 5f, Color.WHITE)
+		for ((block, view) in blocks) {
+			(block as? ExecutableBlock)?.executionFlow?.next?.let { next ->
+				blocks[next]?.let { nextView ->
+					val outgoing = view.outgoingExeuction!!
+					val incoming = nextView.incomingExecution!!
+
+					val start = outgoing.convert(outgoing.bounds.center, to = this)
+					val end = incoming.convert(outgoing.bounds.center, to = this)
+
+					RenderHelper.drawLine(start, end, zIndex, 5f, Color.GREEN)
+				}
+			}
+
+			for (input in block.inputs) {
+				if (input.source == null) continue
+				val source = input.source!!
+
+				blocks[source.block]?.let { sourceView ->
+					view.inputViews[input]?.let { inputView ->
+						sourceView.outputViews[source]?.let { outputView ->
+							val start = inputView.convert(inputView.bounds.center, to = this)
+							val end = outputView.convert(outputView.bounds.center, to = this)
+
+							RenderHelper.drawLine(start, end, zIndex, 5f, Color.RED)
+						}
 					}
+				}
+
+//				val start = block.position
+//				val sourcePosition = source.block.position
+//				val end = Point(sourcePosition.x + blocks[source.block]!!.bounds.width, sourcePosition.y)
+
+//				val inputView = view.inputViews[input]
+//				val outputView =
+//
+//				RenderHelper.drawLine(start, end, zIndex, 5f, Color.RED)
+			}
 		}
 	}
 

src/main/kotlin/net/shadowfacts/cacao/Window.kt

@@ -186,14 +186,13 @@ class Window(
 			return currentlyDraggedView.mouseDragged(startPoint, delta, mouseButton)
 		} else if (startPoint in viewController.view.frame) {
 			val startInView = Point(startPoint.x - viewController.view.frame.left, startPoint.y - viewController.view.frame.top)
-			lateinit var prevView: View
+			var prevView: View? = null
 			var view = viewController.view.subviewsAtPoint(startInView).maxBy(View::zIndex)
 			while (view != null && !view.respondsToDragging) {
 				prevView = view
 				val pointInView = viewController.view.convert(startInView, to = view)
 				view = view.subviewsAtPoint(pointInView).maxBy(View::zIndex)
 			}
-//			this.currentlyDraggedView = viewController.view.subviewsAtPoint(startInView).maxBy(View::zIndex)
 			this.currentDragReceiver = view ?: prevView
 			return this.currentDragReceiver?.mouseDragged(startPoint, delta, mouseButton) ?: false
 		}

src/main/kotlin/net/shadowfacts/cacao/util/Color.kt

@@ -26,6 +26,9 @@ data class Color(val red: Int, val green: Int, val blue: Int, val alpha: Int = 2
 		val CLEAR = Color(0, alpha = 0)
 		val WHITE = Color(0xffffff)
 		val BLACK = Color(0)
+		val RED = Color(0xff0000)
+		val GREEN = Color(0x00ff00)
+		val BLUE = Color(0x0000ff)
 	}
 
 }

src/main/kotlin/net/shadowfacts/cacao/util/RenderHelper.kt

@@ -117,7 +117,7 @@ object RenderHelper {
 	}
 
 	private fun BufferBuilder.color(color: Color): BufferBuilder {
-		color(color.alpha, color.red, color.green, color.blue)
+		color(color.red, color.green, color.blue, color.alpha)
 		return this
 	}
 

src/main/kotlin/net/shadowfacts/cacao/view/StackView.kt

@@ -19,7 +19,7 @@ import java.util.*
  * @param distribution The mode by which this stack lays out its children along the axis perpendicular to the
  * 						primary [axis].
  */
-class StackView(
+open class StackView(
 		val axis: Axis,
 		val distribution: Distribution = Distribution.FILL,
 		val spacing: Double = 0.0

src/test/kotlin/net/shadowfacts/asmr/program/ProgramTests.kt

@@ -16,11 +16,11 @@ class ProgramTests {
 		val one = program.addBlock(ConstantBlock(ProgramType.INT, 3))
 		val two = program.addBlock(ConstantBlock(ProgramType.INT, 7))
 		val multiply = program.addBlock(BinaryOperatorBlock(ProgramType.INT, BinaryOperatorBlock.Operation.MULTIPLY)) {
-			it.left.source = one.output
-			it.right.source = two.output
+			it.left.link(from = one.output)
+			it.right.link(from = two.output)
 		}
 
-		program.startBlock.nextExecutableBlock = multiply
+		program.startBlock.executionFlow.link(multiply)
 
 		program.execute()