canvas/absurd-survivors/src/utils.ts

import {Vector} from "./base.ts";

export function fillDot(position: Vector, size: number, color: string, ctx: CanvasRenderingContext2D) {
    ctx.beginPath();
    ctx.fillStyle = color;
    ctx.arc(position.x, position.y, size, 0, 2 * Math.PI);
    ctx.fill();
}

export function isMobile() {
    // https://stackoverflow.com/questions/11381673/detecting-a-mobile-browser
    let check = false;
    (function(a){if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino|android|ipad|playbook|silk/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0,4))) check = true;})(navigator.userAgent||navigator.vendor);
    return check;
}

export function drawDot(position: Vector, size: number, color: string, ctx: CanvasRenderingContext2D) {
    ctx.beginPath();
    ctx.strokeStyle = color;
    ctx.arc(position.x, position.y, size, 0, 2 * Math.PI);
    ctx.stroke();
}

export function moveInDirectionOf(position: Vector, target: Vector, speedFactor: number): Vector {
    let playerVector = Vector.createVector(target, position);
    let direction = playerVector.normalize()
    return position.add(direction.multiply(speedFactor))
}

export function straightMove(position: Vector, speed: Vector): Vector {
    return position.add(speed)
}

export function toRad(angle) {
    return angle / 180 * Math.PI;
}

export function toDegrees(angle) {
    return angle * 180 / Math.PI
}

export function pointInsideCircle(circleCenter: Vector, radius: number, point: Vector) {
    return circleCenter.distanceTo(point) < radius;
}

export function linePointCollision(point: Vector, lineStart: Vector, lineEnd: Vector) {
    let lineLength = Vector.createVector(lineEnd, lineStart).vecLength();
    let distanceStart = Vector.createVector(lineStart, point).vecLength()
    let distanceEnd = Vector.createVector(lineEnd, point).vecLength();
    let buffer = 0.001
    if((distanceStart + distanceEnd) >= (lineLength - buffer) && (distanceEnd + distanceStart) <= (lineLength + buffer)) {
        return true;
    }
    return false;
}

export function pointOnLineWithinLine(circleCenter: Vector, lineStart: Vector, lineEnd: Vector) {
    let lineVector = Vector.createVector(lineEnd, lineStart)
    let vectorCenterLine = Vector.createVector(circleCenter, lineStart)
    let dot = vectorCenterLine.dotProduct(lineVector)
    let closestX = lineStart.x + (dot * (lineVector.x))
    let closestY = lineStart.y + (dot * (lineVector.y))
    let closestPoint = new Vector(closestX, closestY);
    return linePointCollision(closestPoint, lineStart, lineEnd);
}

export function circleLineCollision(circleCenter: Vector, radius: number, lineStart: Vector, lineEnd: Vector) {
    if(pointInsideCircle(circleCenter, radius, lineStart) || pointInsideCircle(circleCenter, radius, lineEnd)) {
        return true;
    }
    let lineVector = Vector.createVector(lineEnd, lineStart)
    let vectorCenterLine = Vector.createVector(circleCenter, lineStart)
    let dot = vectorCenterLine.dotProduct(lineVector)
    let closestX = lineStart.x + (dot * (lineVector.x))
    let closestY = lineStart.y + (dot * (lineVector.y))
    let closestPoint = new Vector(closestX, closestY);
    let onSegment = linePointCollision(closestPoint, lineStart, lineEnd)
    if(!onSegment) {
        return false;
    }

    return pointInsideCircle(circleCenter, radius, closestPoint);
}

export function getCoordinatesSplit(amount: number) {
    let angle = 2 * Math.PI / amount;
    let points: Vector[] = [];
    for (let i = 0; i < amount; i++) {
        let x = Math.cos(angle * i)
        let y = Math.sin(angle * i)
        points.push(new Vector(x, y))
    }
    return points;
}

export function randomItem(items: any[]) {
    return items[Math.floor(Math.random() * items.length)]
}

export function rectPointIntersection(topLeft: Vector, size: Vector, point: Vector) {
    if (topLeft.x + size.x >= point.x &&
        topLeft.x <= point.x &&
        topLeft.y + size.y >= point.y &&
        topLeft.y <= point.y) {
        return true
    } else {
        return false;
    }
}