stage {
    backdrop Sea("gallery:Nature/Sea")
    let game = true;
    let col = "Red";
    let velocity = 2;
    let gameSpeed = 8;
    let score = 0;
    let canJump = false;

    actor Ball {
        costume Green("gallery:Objects/Ball Green")
        when stage.started {
            this.setPosition(-170, 0);
            this.size = 50;
            this.show();
            this.physics.collisionShape = "circle";
            showVariable(ref score);
            game = true;
            while(game) {
                if(!this.touchingActorOrClone(Slider)) {
                    this.y += velocity;
                    velocity -= 0.1;
                    this.wait(0.0001);
                }
                else {
                    if(isKeyPressed("up arrow")) {
                        if(canJump){
                            score += 1;
                            canJump = false;
                        }
                        this.y += 0.4;
                        velocity = 3;
                    }
                }
            }
        }

        when stage.started{
            while(game){
                this.wait(5);
                gameSpeed -= 0.5;
            }
        }
        when stage.started{
            while(game){
                if(canJump == false){
                    this.wait(0.5);
                    canJump = true;
                }
                if(this.y < -100){
                    game = false;
                    stage.broadcast("end");
                    this.hide();
                }
            }
        }
    }

    actor Slider {
        default costume Red("gallery:Objects/Slider Red")
        costume Blue("gallery:Objects/Slider Blue")
        when stage.started {
            this.setPosition(-140, -50);
            this.size = 100;
            this.hide();
            for(let i = 1; i <= 10; i++) {
                createClone(this);
                this.x += 100;
            }
            while(game) {
                if(score < 21){
                    createClone(this);
                    this.wait(1);
                }else{
                    createClone(this);
                    this.wait(0.5);
                }
            }
        }
        when cloned {
            this.setCostume(Math.randomBetween(1, 2));
            this.y += Math.randomBetween(-2, 2) * 20;
            if(col == "Red") {
                if(this.costumeName == "Red") {
                    this.opacity = 100;
                }
                if(this.costumeName == "Blue") {
                    this.opacity = 30;
                }
            }
            if(col == "Blue") {
                if(this.costumeName == "Red") {
                    this.opacity = 30;
                }
                if(this.costumeName == "Blue") {
                    this.opacity = 100;
                }
            }
            this.show();
            this.glideSecondsTo(gameSpeed,this.x-1100,this.y);
            this.deleteClone(this);
        }
        when stage.keyPressed("left arrow") {
            if(this.cloneId == 0) {
                col = "Red";
                stage.broadcastAndWait("changecolor");
            }
        }
        when stage.keyPressed("right arrow") {
            if(this.cloneId == 0) {
                col = "Blue";
                stage.broadcastAndWait("changecolor");
            }
        }
        when stage.signalReceived("changecolor") {
            if(this.cloneId != 0) {
                if(col == "Red") {
                    if(this.costumeName == "Red") {
                        this.opacity = 100;
                    }
                    if(this.costumeName == "Blue") {
                        this.opacity = 30;
                    }
                }
                if(col == "Blue") {
                    if(this.costumeName == "Red") {
                        this.opacity = 30;
                    }
                    if(this.costumeName == "Blue") {
                        this.opacity = 100;
                    }
                }
            }
        }
        when cloned {
            while(game) {
                if(this.touching(Ball)) {
                    if(this.opacity != 100) {
                        this.wait(0.1);
                        this.deleteClone(this);
                    }
                }
            }
        }

        when stage.signalReceived("end"){
            deleteClone(this);
        }
    }
}