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export interface PointInterface{
x: number;
y: number;
}
export class Point{
x: number;
y: number;
constructor(x:number, y:number){
this.x = x;
this.y = y;
}
distance(otherPoint: Point): number{
return Math.sqrt((this.x - otherPoint.x)**2 + (this.y - otherPoint.y)**2);
}
middle(otherPoint: Point): Point{
return new Point(Math.round(0.5*(this.x-otherPoint.x)), Math.round(0.5*(this.y-otherPoint.y)));
}
subtract(point: Point): Point{
return new Point(this.x - point.x, this.y - point.y);
}
add(point: Point): Point{
return new Point(this.x + point.x, this.y + point.y);
}
}
export class ColorPalette{
background: string;
border: string;
foreground: string;
alert: string;
constructor(background: string, border: string, foreground:string, alert:string){
this.background = background;
this.border = border;
this.foreground = foreground;
this.alert = alert;
}
}
export const darkPalette = new ColorPalette("#292929", "#FFFFFF", "#474747", "#d1b036");
export const lightPalette = new ColorPalette("#FFFFFF", "#000000", "#a8a8a8", "#d1b036");
export class TextStyle{
color: string;
align: CanvasTextAlign;
baseLine: CanvasTextBaseline;
constructor(color: string, align: CanvasTextAlign="center", baseLine: CanvasTextBaseline="middle"){
this.color = color;
this.align = align;
this.baseLine = baseLine;
}
}
export class EdgeStyle{
lineWidth: number;
lineColor: string;
constructor(lineWidth: number, lineColor: string){
this.lineWidth = lineWidth;
this.lineColor = lineColor;
}
}
export class SurfaceStyle{
fillColor: string | null;
lineWidth: number;
lineColor: string;
constructor(fillColor: string | null, lineWidth: number, lineColor: string = ""){
this.fillColor = fillColor;
this.lineWidth = lineWidth;
this.lineColor = lineColor;
}
}
function getPerpendicularBisector(point1: Point, point2: Point) {
const midX = (point1.x + point2.x) / 2;
const midY = (point1.y + point2.y) / 2;
const dx = point2.x - point1.x;
const dy = point2.y - point1.y;
return {
x: midX,
y: midY,
slope: -dx / dy
};
}
export class Drawer{
context: CanvasRenderingContext2D;
constructor(context: CanvasRenderingContext2D){
this.context = context;
}
drawText(text: string, x:number, y:number, style:TextStyle, fontSize: number = 12){
this.context.textAlign = style.align;
this.context.textBaseline = style.baseLine;
this.context.beginPath();
this.context.fillStyle = style.color;
this.context.font = this.context.font.replace(/(?<value>\d+\.?\d*)/, fontSize.toString());
this.context.fillText(text, x, y);
this.context.closePath();
}
drawRectangle(xmin: number, ymax:number, width:number, height:number, style:SurfaceStyle){
this.context.beginPath();
this.context.rect(xmin, ymax, width, height);
Eif (style.fillColor !== null){
this.context.fillStyle = style.fillColor;
this.context.fill();
}
if (style.lineWidth > 0){
this.context.lineWidth = style.lineWidth;
this.context.strokeStyle = style.lineColor;
this.context.stroke();
}
this.context.closePath();
}
drawCircle(x: number, y:number, radius:number, style:SurfaceStyle){
this.drawArc(x, y, radius, 0, 2*Math.PI, style);
}
drawArc(x: number, y:number, radius:number, startAngle: number, endAngle: number, style:SurfaceStyle, trigo:boolean=true){
this.context.beginPath();
this.context.arc(x, y, radius, startAngle, endAngle, trigo);
Eif (style.fillColor !== null){
this.context.fillStyle = style.fillColor;
this.context.fill();
}
Eif (style.lineWidth > 0){
this.context.lineWidth = style.lineWidth;
this.context.strokeStyle = style.lineColor;
this.context.stroke();
}
this.context.closePath();
}
drawArcFromPoints(start:Point, interior:Point, end:Point, style:SurfaceStyle){
this.context.beginPath();
// Calculate the perpendicular bisectors of the segments start-interior and interior-end
const bisector1 = getPerpendicularBisector(start, interior);
const bisector2 = getPerpendicularBisector(interior, end);
// Calculate the intersection of the two bisectors, which is the circle center
const centerX = (bisector2.y - bisector1.y + bisector1.slope * bisector1.x - bisector2.slope * bisector2.x) /
(bisector1.slope - bisector2.slope);
const centerY = bisector1.slope * (centerX - bisector1.x) + bisector1.y;
// Calculate the radius as the distance from the center to the start point
const radius = Math.sqrt((start.x - centerX) ** 2 + (start.y - centerY) ** 2);
// Calculate start and end angles
const startAngle = Math.atan2(start.y - centerY, start.x - centerX);
const interiorAngle = Math.atan2(interior.y - centerY, interior.x - centerX);
const endAngle = Math.atan2(end.y - centerY, end.x - centerX);
// Determine direction based on the order of angles (clockwise or counter-clockwise)
const isClockwise = (interiorAngle > startAngle && interiorAngle < endAngle);
// Draw the arc
this.context.beginPath();
this.context.arc(centerX, centerY, radius, startAngle, endAngle, !isClockwise);
Eif (style.fillColor !== null){
this.context.fillStyle = style.fillColor;
this.context.fill();
}
Eif (style.lineWidth > 0){
this.context.lineWidth = style.lineWidth;
this.context.strokeStyle = style.lineColor;
this.context.stroke();
}
this.context.closePath();
}
drawArrow(start: Point, end:Point, style:EdgeStyle){
this.context.beginPath();
const headlen = 10;
const angle = Math.atan2(end.y-start.y,end.x-start.x);
this.context.moveTo(start.x, start.y);
this.context.lineTo(end.x, end.y);
this.context.lineWidth = style.lineWidth;
this.context.stroke();
//starting a new path from the head of the arrow to one of the sides of
//the point
this.context.beginPath();
this.context.moveTo(end.x, end.y);
this.context.lineTo(end.x-headlen*Math.cos(angle-Math.PI/7),
end.y-headlen*Math.sin(angle-Math.PI/7));
//path from the side point of the arrow, to the other side point
this.context.lineTo(end.x-headlen*Math.cos(angle+Math.PI/7),
end.y-headlen*Math.sin(angle+Math.PI/7));
//path from the side point back to the tip of the arrow, and then
//again to the opposite side point
this.context.lineTo(end.x, end.y);
this.context.lineTo(end.x-headlen*Math.cos(angle-Math.PI/7),
end.y-headlen*Math.sin(angle-Math.PI/7));
this.context.lineWidth = style.lineWidth;
this.context.strokeStyle = style.lineColor;
this.context.stroke();
this.context.closePath();
}
drawPolygon(points: Point[], style:SurfaceStyle){
this.context.beginPath();
this.context.moveTo(points[0].x, points[0].y);
for (const point of points.slice(1)){
this.context.lineTo(point.x, point.y);
}
this.context.lineWidth = style.lineWidth;
this.context.strokeStyle = style.lineColor;
this.context.stroke();
if (style.fillColor){
this.context.fillStyle = style.fillColor;
this.context.fill();
}
this.context.closePath();
}
drawLine(start: Point, end: Point, style:EdgeStyle){
this.context.beginPath();
this.context.moveTo(start.x, start.y);
this.context.lineTo(end.x, end.y);
this.context.lineWidth = style.lineWidth;
this.context.strokeStyle = style.lineColor;
this.context.stroke();
this.context.closePath();
}
}
export class Zone{
xMin: number;
yMin: number;
xMax: number;
yMax: number;
constructor(xMin: number, xMax: number, yMin: number, yMax: number){
if (xMin == xMax){
xMin -= 0.5;
xMax += 0.5;
}
if (yMin == yMax){
yMin -= 0.5;
yMax += 0.5;
}
this.xMin = xMin;
this.xMax = xMax;
this.yMin = yMin;
this.yMax = yMax;
}
get center(){
return new Point(0.5*(this.xMin + this.xMax), 0.5*(this.yMin + this.yMax));
}
aspect_ratio(){
return (this.xMax - this.xMin) / (this.yMax - this.yMin);
}
static fromPoints(points: Point[]): Zone{
let xMin = points[0].x;
let yMin = points[0].y;
let xMax = points[0].x;
let yMax = points[0].y;
for (const point of points){
xMin = Math.min(xMin, point.x);
xMax = Math.max(xMax, point.x);
yMin = Math.min(yMin, point.y);
yMax = Math.max(yMax, point.y);
}
return new Zone(xMin, xMax, yMin, yMax);
}
}
export class ViewWindow extends Zone{
displayWidth: number;
displayHeight: number;
constructor(xmin: number, xmax: number, ymin: number, ymax: number, displayWidth: number, displayHeight: number){
super(xmin, xmax, ymin, ymax);
this.displayWidth = displayWidth;
this.displayHeight = displayHeight;
}
get xScale(): number{
return (this.xMax - this.xMin) / this.displayWidth;
}
get yScale(): number{
return (this.yMax - this.yMin) / this.displayHeight;
}
get scale(): number{
return Math.min(this.xScale, this.yScale);
}
size(size: number){
return Math.round(size / this.scale);
}
resize(newDisplayWidth: number, newDisplayHeight: number): void {
this.adjustToZone(this.toZone(), newDisplayWidth, newDisplayHeight);
this.displayHeight = newDisplayHeight;
this.displayWidth = newDisplayWidth;
}
toZone(){
return new Zone(this.xMin, this.xMax, this.yMin, this.yMax);
}
adjustToZone(zone:Zone, displayWidth: number, displayHeight: number): void{
// Try adjust height
const ratio = zone.aspect_ratio() / (displayWidth / displayHeight);
if (ratio < 1){
// Height adjust
this.yMin = zone.yMin;
this.yMax = zone.yMax;
const deltaX = (zone.xMax - zone.xMin) / ratio;
this.xMin = 0.5*(zone.xMin + zone.xMax) - 0.5 * deltaX;
this.xMax = this.xMin + deltaX;
}
else{
// Width adjust
this.xMin = zone.xMin;
this.xMax = zone.xMax;
const deltaY = (zone.yMax - zone.yMin) * ratio;
this.yMin = 0.5*(zone.yMin + zone.yMax) - 0.5 * deltaY;
this.yMax = this.yMin + deltaY;
}
this.displayWidth = displayWidth;
this.displayHeight = displayHeight;
}
pixelMargins(xMargin: number, yMargin: number){
this.xMin = this.xMin - xMargin*this.xScale;
this.xMax = this.xMax + xMargin*this.xScale;
this.yMin = this.yMin - yMargin*this.yScale;
this.yMax = this.yMax + yMargin*this.yScale;
}
zoneOffset(x: number, y: number){
this.xMin += x;
this.xMax += x;
this.yMin += y;
this.yMax += y;
}
displayOffset(pixelsX: number, pixelsY: number){
const dx = pixelsX * this.xScale;
const dy = pixelsY * this.yScale;
this.xMin += dx;
this.xMax += dx;
this.yMin += dy;
this.yMax += dy;
}
displayZoom(scale: number){
const dX = 0.5 * scale * (this.xMax - this.xMin);
const dY = 0.5 * scale * (this.yMax - this.yMin);
this.xMin = this.center.x -dX;
this.xMax = this.center.x + dX;
this.yMin = this.center.y - dY;
this.yMax = this.center.y + dY;
}
canvasPoint(zonePoint: Point): Point{
const x = Math.round((zonePoint.x - this.xMin) / (this.xMax - this.xMin) * this.displayWidth);
const y = Math.round((1 - (zonePoint.y - this.yMin) / (this.yMax - this.yMin)) * this.displayHeight);
return new Point(x, y);
}
zonePoint(canvasPoint: Point): Point {
const x = (canvasPoint.x / this.displayWidth) * (this.xMax - this.xMin) + this.xMin;
const y = this.yMax - (canvasPoint.y / this.displayHeight) * (this.yMax - this.yMin);
return new Point(x, y);
}
}
export abstract class DrawObject{
abstract draw(context: CanvasRenderingContext2D, viewWindow: ViewWindow): void;
abstract get zone(): Zone;
abstract mouseDownCallback(clickPoint: Point, viewWindow: ViewWindow): boolean;
}
export class Canvas{
context: CanvasRenderingContext2D;
drawObject: DrawObject;
viewWindow: ViewWindow;
drag: boolean = false;
lastDragPosition: Point;
scaleSensitivity: number = 0.04;
constructor(context: CanvasRenderingContext2D, drawObject: DrawObject){
this.context = context;
this.drawObject = drawObject;
this.viewWindow = new ViewWindow(0, 0, 0, 0, 0, 0);
this.viewWindow.adjustToZone(this.drawObject.zone, this.context.canvas.width, this.context.canvas.height);
this.viewWindow.pixelMargins(50, 50);
window.addEventListener('resize', () => {
this.resize();
this.draw();
});
context.canvas.addEventListener('mousedown', (event) => {
this.drag = true;
const clickPoint = this.clickPoint(context, event.clientX, event.clientY);
this.drag = this.drawObject.mouseDownCallback(clickPoint, this.viewWindow);
this.lastDragPosition = clickPoint;
});
context.canvas.addEventListener('mouseup', () => {
this.drag = false;
});
context.canvas.addEventListener('mousemove', (event) => {
Iif (this.drag){
const position = this.clickPoint(context, event.clientX, event.clientY);
const move = position.subtract(this.lastDragPosition);
this.viewWindow.displayOffset(-move.x, move.y);
this.lastDragPosition = position;
this.draw();
}
});
context.canvas.addEventListener('wheel', (event) => {
let scale = 1 - this.scaleSensitivity;
if ( event.deltaY > 0){
scale = 1 + this.scaleSensitivity;
}
this.viewWindow.displayZoom(scale);
this.draw();
});
this.resize();
this.draw();
}
clickPoint(context: CanvasRenderingContext2D, clientX: number, clientY: number){
const rect = context.canvas.getBoundingClientRect();
const scaleX = context.canvas.width / rect.width;
const scaleY = context.canvas.height / rect.height;
// Adjust click coordinates by scaling
return new Point(
(clientX - rect.left) * scaleX,
(clientY - rect.top) * scaleY
);
}
resize() {
this.context.canvas.width = window.innerWidth;
this.context.canvas.height = window.innerHeight;
this.viewWindow.resize(this.context.canvas.width, this.context.canvas.height);
}
drawCanvasGrid(context: CanvasRenderingContext2D){
const drawer = new Drawer(context);
const nGrid = 10;
const style = new EdgeStyle(1, "#bfbcbb");
for (let i=0; i<=nGrid+1; i++){
const x = this.viewWindow.xMin + (this.viewWindow.xMax - this.viewWindow.xMin) * i/nGrid;
const start = this.viewWindow.canvasPoint(new Point(x, this.viewWindow.yMin));
const end = this.viewWindow.canvasPoint(new Point(x, this.viewWindow.yMax));
drawer.drawLine(start, end, style);
drawer.drawText("x= "+(Math.round(x*100)/100).toString(), start.x, end.y+20, new TextStyle("#bfbcbb"));
}
for (let i=0; i<=nGrid+1; i++){
const y = this.viewWindow.yMin + (this.viewWindow.yMax - this.viewWindow.yMin) * i/nGrid;
const start = this.viewWindow.canvasPoint(new Point(this.viewWindow.xMin, y));
const end = this.viewWindow.canvasPoint(new Point(this.viewWindow.xMax, y));
drawer.drawLine(start, end, style);
drawer.drawText("y= "+(Math.round(y*100)/100).toString(), start.x+20, end.y, new TextStyle("#bfbcbb"));
}
}
drawPixelGrid(context: CanvasRenderingContext2D){
const drawer = new Drawer(context);
const gridPixels = 100;
const style = new EdgeStyle(1, "#bfbcbb");
const nX = Math.ceil(this.viewWindow.displayWidth/gridPixels);
for (let i=0; i<=nX; i++){
const x = i*gridPixels;
const start = new Point(x, 0);
const end = new Point(x, this.viewWindow.displayHeight);
drawer.drawLine(start, end, style);
drawer.drawText("px= "+x.toString()+ " ("+Math.round(x/this.viewWindow.displayWidth*100).toString() +"%)", start.x, end.y-20, new TextStyle("#bfbcbb"));
}
}
drawZoneGrid(context: CanvasRenderingContext2D){
const drawer = new Drawer(context);
const style = new EdgeStyle(1, "#bfbcbb");
const redStyle = new EdgeStyle(1, "#ff4f42");
const xStart = Math.floor(this.viewWindow.xMin);
const xEnd = Math.ceil(this.viewWindow.xMax);
const yStart = Math.floor(this.viewWindow.yMin);
const yEnd = Math.ceil(this.viewWindow.yMax);
for (let x=xStart; x<=xEnd; x++){
const start = this.viewWindow.canvasPoint(new Point(x, yStart));
const end = this.viewWindow.canvasPoint(new Point(x, yEnd));
drawer.drawLine(start, end, style);
drawer.drawText("x= "+(Math.round(x*100)/100).toString(), start.x, end.y+20, new TextStyle("#bfbcbb"));
}
drawer.drawLine(this.viewWindow.canvasPoint(new Point(0, yStart)), this.viewWindow.canvasPoint(new Point(0 , yEnd)), redStyle);
for (let y=yStart; y<=xEnd; y++){
const start = this.viewWindow.canvasPoint(new Point(xStart, y));
const end = this.viewWindow.canvasPoint(new Point(xEnd, y));
drawer.drawLine(start, end, style);
drawer.drawText("x= "+(Math.round(y*100)/100).toString(), start.x, end.y+20, new TextStyle("#bfbcbb"));
}
drawer.drawLine(this.viewWindow.canvasPoint(new Point(xStart, 0)), this.viewWindow.canvasPoint(new Point(xEnd, 0)), redStyle);
}
draw(){
this.drawObject.draw(this.context, this.viewWindow);
}
}
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