69 lines
1.6 KiB
JavaScript
69 lines
1.6 KiB
JavaScript
function Walker(){
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this.x = START_X;
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this.y = START_Y;
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this.vx = 0;
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this.vy = 0;
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this.r = 10;
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this.angle = Math.random() * Math.PI * 2;
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}
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Walker.prototype = {
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/** Update the stats */
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update: function(){
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if(Math.random() > 0.5){
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this.angle += Math.random()* 2 -1;
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}
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// Calculate next position
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this.ax = Math.cos(this.angle);
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this.ay = Math.sin(this.angle);
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this.vx += this.ax;
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this.vy += this.ay;
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// Limit speeds to maximum speed
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this.vx = this.vx > MAX_SPEED/2 ? MAX_SPEED/2 : this.vx < -MAX_SPEED/2 ? -MAX_SPEED/2 : this.vx;
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this.vy = this.vy > MAX_SPEED/2 ? MAX_SPEED/2 : this.vy < -MAX_SPEED/2 ? -MAX_SPEED/2 : this.vy;
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this.x += this.vx;
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this.y += this.vy;
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// Limit position to width and height
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this.x = this.x >= WIDTH ? WIDTH : this.x <= 0 ? 0 : this.x;
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this.y = this.y >= HEIGHT ? HEIGHT : this.y <= 0 ? 0 : this.y;
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if(this.x == 0 || this.x == WIDTH){
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this.vx = -this.vx;
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this.angle += PI;
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}
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if(this.y == 0 || this.y == HEIGHT){
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this.vy = -this.vy;
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this.angle += PI;
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}
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},
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reset: function(){
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this.x = START_X;
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this.y = START_Y;
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this.vx = 0;
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this.vy = 0;
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this.angle = Math.random() * Math.PI * 2;
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},
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/** Display the walker on the field */
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show: function(){
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fill(0);
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ellipse(this.x, this.y, this.r*2);
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// Score radius
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noFill();
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stroke('lightgreen');
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strokeWeight(2);
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ellipse(this.x, this.y, SCORE_RADIUS*2);
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noStroke();
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},
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};
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