ECAD (Electronic CAD) Diagram Family

ECAD family: passives, semiconductors, power and logic symbols

Overview
Node Types
Connection Points
Connection Conventions
Usage Example

Overview

Base Control: ECADControl : MaterialControl
Namespace: Beep.Skia.ECAD

The ECADControl is the root control for this diagram family. It inherits MaterialControl and provides shared port management, styling, and template methods for all nodes in the family.

This family contains 17 node types.

Node Types

Node Class	Shape	Description
`ECADResistorNode`	Zigzag line	Resistor with value and tolerance.
`ECADCapacitorNode`	Parallel plates	Capacitor (polarized or non-polarized).
`ECADDiodeNode`	Triangle with bar	Diode including LED, Zener, Schottky variants.
`ECADFuseNode`	Wire with break	Fuse/circuit breaker.
`ECADICNode`	Rectangle with pin grid	Integrated circuit with configurable pin count.
`ECADInductorNode`	Coil loops	Inductor/coil with inductance value.
`ECADOpAmpNode`	Triangle with +/- inputs	Operational amplifier with inverting/non-inverting inputs.
`ECADTransistorNode`	Circle with 3 legs	BJT (NPN/PNP) with collector, base, emitter.
`ECADGroundNode`	Ground symbol	Ground/reference point.
`ECADBatteryNode`	Long/short line pair	DC power source.
`ECADPowerSupplyNode`	Circle with +/-	Power supply unit with voltage/current output.
`ECADVoltageRegulatorNode`	Rectangle with Vout	Linear/switching voltage regulator.
`ECADTransformerNode`	Two coils	Transformer with primary/secondary windings.
`ECADLogicGateNode`	AND/OR/NOT gate symbol	Logic gate (AND, OR, NOT, NAND, NOR, XOR).
`ECADMicrocontrollerNode`	Rectangle with pins	Microcontroller/MCU with GPIO, ADC, UART, I2C.
`ECADMemoryNode`	Rectangle with address/data	Memory chip (RAM, ROM, EEPROM, Flash).
`ECADTraceNode`	Line with width	PCB trace/routing line with configurable width.

ECADResistorNode

Resistor with value and tolerance.

Shape	Zigzag line
Input Ports	1
Output Ports	1

ECADCapacitorNode

Capacitor (polarized or non-polarized).

Shape	Parallel plates
Input Ports	1
Output Ports	1

ECADDiodeNode

Diode including LED, Zener, Schottky variants.

Shape	Triangle with bar
Input Ports	1
Output Ports	1

ECADFuseNode

Fuse/circuit breaker.

Shape	Wire with break
Input Ports	1
Output Ports	1

ECADICNode

Integrated circuit with configurable pin count.

Shape	Rectangle with pin grid
Input Ports	4+ (left)
Output Ports	4+ (right)

ECADInductorNode

Inductor/coil with inductance value.

Shape	Coil loops
Input Ports	1
Output Ports	1

ECADOpAmpNode

Operational amplifier with inverting/non-inverting inputs.

Shape	Triangle with +/- inputs
Input Ports	2
Output Ports	1

ECADTransistorNode

BJT (NPN/PNP) with collector, base, emitter.

Shape	Circle with 3 legs
Input Ports	1
Output Ports	1

ECADGroundNode

Ground/reference point.

Shape	Ground symbol
Input Ports	1
Output Ports	0

ECADBatteryNode

DC power source.

Shape	Long/short line pair
Input Ports	0
Output Ports	1

ECADPowerSupplyNode

Power supply unit with voltage/current output.

Shape	Circle with +/-
Input Ports	0
Output Ports	1+

ECADVoltageRegulatorNode

Linear/switching voltage regulator.

Shape	Rectangle with Vout
Input Ports	1
Output Ports	1

ECADTransformerNode

Transformer with primary/secondary windings.

Shape	Two coils
Input Ports	2
Output Ports	2

ECADLogicGateNode

Logic gate (AND, OR, NOT, NAND, NOR, XOR).

Shape	AND/OR/NOT gate symbol
Input Ports	2+
Output Ports	1

ECADMicrocontrollerNode

Microcontroller/MCU with GPIO, ADC, UART, I2C.

Shape	Rectangle with pins
Input Ports	8+
Output Ports	8+

ECADMemoryNode

Memory chip (RAM, ROM, EEPROM, Flash).

Shape	Rectangle with address/data
Input Ports	4+
Output Ports	4+

ECADTraceNode

PCB trace/routing line with configurable width.

Shape	Line with width
Input Ports	0
Output Ports	0

Connection Points

Every node in this family exposes connection points (ports) for linking to other nodes. Port positions are computed lazily by LayoutPorts(), which runs when MarkPortsDirty() flags the layout as stale after a move or resize.

Node Class	Input Ports	Output Ports	Extra
`ECADResistorNode`	1	1	—
`ECADCapacitorNode`	1	1	—
`ECADDiodeNode`	1	1	—
`ECADFuseNode`	1	1	—
`ECADICNode`	4+ (left)	4+ (right)	—
`ECADInductorNode`	1	1	—
`ECADOpAmpNode`	2	1	—
`ECADTransistorNode`	1	1	—
`ECADGroundNode`	1	0	—
`ECADBatteryNode`	0	1	—
`ECADPowerSupplyNode`	0	1+	—
`ECADVoltageRegulatorNode`	1	1	—
`ECADTransformerNode`	2	2	—
`ECADLogicGateNode`	2+	1	—
`ECADMicrocontrollerNode`	8+	8+	—
`ECADMemoryNode`	4+	4+	—
`ECADTraceNode`	0	0	—

Connection Conventions

When building diagrams with this family, follow these conventions:

Components follow IEEE/ANSI standard symbols
IC pins are configurable via NodeProperties
Ground and power are global reference nodes
Traces connect component ports

Usage Example

Complete example showing creation, node placement, and connection:

C# Example

var ecad = new ECADControl
{
    X = 50, Y = 50,
    Width = 700, Height = 500
};
drawingManager.AddComponent(ecad);

var bat = new ECADBatteryNode { X = 100, Y = 200, Voltage = "9V" };
var res = new ECADResistorNode { X = 250, Y = 150, Resistance = "1kΩ" };
var led = new ECADDiodeNode { X = 400, Y = 150, ForwardVoltage = "2.1V" };
var gnd = new ECADGroundNode { X = 400, Y = 300 };

drawingManager.AddComponent(bat);
drawingManager.AddComponent(res);
drawingManager.AddComponent(led);
drawingManager.AddComponent(gnd);

drawingManager.ConnectComponents(bat.OutPoints[0], res.InPoints[0]);
drawingManager.ConnectComponents(res.OutPoints[0], led.InPoints[0]);
drawingManager.ConnectComponents(led.OutPoints[0], gnd.InPoints[0]);

Electrical Rules Check

ElectricalRulesChecker validates the electrical consistency of the diagram: floating inputs, conflicting drivers, missing power or ground, and pin-type mismatches. Violations are data, not exceptions:

Member	Type	Description
`RunChecks(components, lines)`	`void`	Runs every rule and fills `Violations`.
`Violations`	`List<ElectricalRuleViolation>`	One entry per problem found.
`ElectricalRuleViolation.Message`	`string`	Human-readable description.
`ElectricalRuleViolation.Severity`	`ElectricalViolationSeverity`	Warning or error.
`ElectricalRuleViolation.Category`	`string`	Rule family that produced the violation.
`ElectricalRuleViolation.FixSuggestion`	`string`	Suggested remedy, when known.
`ElectricalRuleViolation.Component` / `Port` / `Line`	model refs	What the violation is attached to, for selection and highlighting.

var checker = new ElectricalRulesChecker();
checker.RunChecks(drawingManager.GetComponents().ToList(), drawingManager.GetLines());

int errors = checker.Violations.Count(v => v.Severity == ElectricalViolationSeverity.Error);
foreach (var violation in checker.Violations)
    Console.WriteLine($"[{violation.Severity}] {violation.Category}: {violation.Message}");

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