96 lines
1.9 KiB
JavaScript
96 lines
1.9 KiB
JavaScript
let angle,
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x,
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y,
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drawing = true,
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turtleC;
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function setup() {
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createCanvas(windowWidth, windowHeight); //canvas is size of window
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resetDefaults();
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turtle();
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displayTurtle();
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}
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function resetDefaults() {
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angleMode(DEGREES); //instead of p5.js's default RADIANS
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angle = 180; //facing up
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x = width / 2; //start turtle in center
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y = height / 2;
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}
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function setpos(_newX, _newY, startx = x, starty = y) {
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let newX = _newX;
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let newY = _newY;
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if (drawing) {
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line(startx, starty, newX, newY);
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}
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x = newX;
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y = newY;
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try {
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if ((_newX == "") || (_newY == "")) throw "is missing input x,y coordinates";
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if (isNaN(_newX) || (isNaN(_newY))) throw "requires: x,y input coordinates";
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if ((_newX < 0) || (_newY < 0) || (_newX > windowWidth) || (_newY > windowHeight)) throw "drawing offscreen";
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} catch (err) {
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console.log("Error: setpos " + err);
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}
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}
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function forward(d, startx = x, starty = y, _angle = 360 - angle) {
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let newX = startx + d * sin(_angle);
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let newY = starty + d * cos(_angle);
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if (drawing) {
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line(startx, starty, newX, newY);
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}
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x = newX;
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y = newY;
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}
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function back(d, startx = x, starty = y, _angle = 180 - angle) {
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let newX = startx + d * sin(_angle);
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let newY = starty + d * cos(_angle);
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if (drawing) {
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line(startx, starty, newX, newY);
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}
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x = newX;
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y = newY;
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}
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function left(_angle) {
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angle -= _angle;
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}
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function right(_angle) {
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angle += _angle;
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}
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function pendown() {
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drawing = true;
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}
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function penup() {
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drawing = false;
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}
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function penSize(weight = 1) {
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strokeWeight(weight);
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}
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function penColor(c) {
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stroke(c);
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}
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function randint(max = 100) {
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//default returns int between 0 and 100
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return int(random(max));
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}
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function displayTurtle() {
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stroke(0, 255, 0);
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strokeWeight(1);
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fill(0, 255, 0);
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push();
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translate(x, y);
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rotate(180 + angle);
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triangle(-10, 10, 10, 10, 0, -10);
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pop();
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}
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function windowResized() {
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//resizes canvas if window is resized
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resizeCanvas(windowWidth, windowHeight);
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}
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