simulator/src/sequential/Dlatch.js
import CircuitElement from '../circuitElement';
import Node, { findNode } from '../node';
import simulationArea from '../simulationArea';
import { correctWidth, lineTo, moveTo, fillText } from '../canvasApi';
/**
* @class
* Dlatch
* D latch has 2 input nodes:
* clock, data input.
* Difference between this and D - FlipFlop is
* that Flip flop must have a clock.
* @extends CircuitElement
* @param {number} x - x coord of element
* @param {number} y - y coord of element
* @param {Scope=} scope - the ciruit in which we want the Element
* @param {string=} dir - direcion in which element has to drawn
* @category sequential
*/
import { colors } from '../themer/themer';
export default class Dlatch extends CircuitElement {
constructor(x, y, scope = globalScope, dir = 'RIGHT', bitWidth = 1) {
super(x, y, scope, dir, bitWidth);
/*
this.scope['Dlatch'].push(this);
*/
this.directionFixed = true;
this.setDimensions(20, 20);
this.rectangleObject = true;
this.clockInp = new Node(-20, +10, 0, this, 1, 'Clock');
this.dInp = new Node(-20, -10, 0, this, this.bitWidth, 'D');
this.qOutput = new Node(20, -10, 1, this, this.bitWidth, 'Q');
this.qInvOutput = new Node(20, 10, 1, this, this.bitWidth, 'Q Inverse');
// this.reset = new Node(10, 20, 0, this, 1, "Asynchronous Reset");
// this.preset = new Node(0, 20, 0, this, this.bitWidth, "Preset");
// this.en = new Node(-10, 20, 0, this, 1, "Enable");
this.state = 0;
this.prevClockState = 0;
this.wasClicked = false;
}
/**
* Idea: shoould be D FF?
*/
isResolvable() {
if (this.clockInp.value != undefined && this.dInp.value != undefined) return true;
return false;
}
newBitWidth(bitWidth) {
this.bitWidth = bitWidth;
this.dInp.bitWidth = bitWidth;
this.qOutput.bitWidth = bitWidth;
this.qInvOutput.bitWidth = bitWidth;
// this.preset.bitWidth = bitWidth;
}
/**
* @memberof Dlatch
* when the clock input is high we update the state
* qOutput is set to the state
*/
resolve() {
if (this.clockInp.value == 1 && this.dInp.value != undefined) {
this.state = this.dInp.value;
}
if (this.qOutput.value != this.state) {
this.qOutput.value = this.state;
this.qInvOutput.value = this.flipBits(this.state);
simulationArea.simulationQueue.add(this.qOutput);
simulationArea.simulationQueue.add(this.qInvOutput);
}
}
customSave() {
var data = {
nodes: {
clockInp: findNode(this.clockInp),
dInp: findNode(this.dInp),
qOutput: findNode(this.qOutput),
qInvOutput: findNode(this.qInvOutput),
// reset: findNode(this.reset),
// preset: findNode(this.preset),
// en: findNode(this.en),
},
constructorParamaters: [this.direction, this.bitWidth],
};
return data;
}
customDraw() {
var ctx = simulationArea.context;
ctx.strokeStyle = (colors['stroke']);
ctx.fillStyle = colors['fill'];
ctx.beginPath();
ctx.lineWidth = correctWidth(3);
var xx = this.x;
var yy = this.y;
// rect(ctx, xx - 20, yy - 20, 40, 40);
moveTo(ctx, -20, 5, xx, yy, this.direction);
lineTo(ctx, -15, 10, xx, yy, this.direction);
lineTo(ctx, -20, 15, xx, yy, this.direction);
// if ((this.b.hover&&!simulationArea.shiftDown)|| simulationArea.lastSelected == this || simulationArea.multipleObjectSelections.contains(this)) ctx.fillStyle = "rgba(255, 255, 32,0.8)";ctx.fill();
ctx.stroke();
ctx.beginPath();
ctx.font = '20px Raleway';
ctx.fillStyle = colors['input_text'];
ctx.textAlign = 'center';
fillText(ctx, this.state.toString(16), xx, yy + 5);
ctx.fill();
}
}
Dlatch.prototype.tooltipText = 'D Latch : Single input Flip flop or D FlipFlop';
Dlatch.prototype.helplink = 'https://docs.circuitverse.org/#/chapter4/6sequentialelements?id=d-latch';
Dlatch.prototype.objectType = 'Dlatch';