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Thread: StdDraw keyboard controls uncontrollable

  1. #1
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    Exclamation StdDraw keyboard controls uncontrollable

    - controlling two characters using WASD and IJKL
    - using StdDraw hasNextKeyTyped to check keyTyped against WASD/IJKL ascii codes
    - however characters move too quickly, cannot stop and do not respond to keyboard controls/typed keys after a while
    - any feedback/guidance/advice will be greatly appreciated, TIA

    /**
     * Description of PvH
     * May 25, 2017
     */
    import java.util.Scanner;
    import java.awt.Font;
    import java.awt.GraphicsEnvironment;
    import java.util.ArrayList;
    import java.awt.event.*;
    import javax.swing.*;
     
    public class Game {
        public void newGame(String command) {
            boolean diagon = false;
            double hx = 100.0, hy = 150.0, px = 15.0, py = 150.0;
            if (command.equals("play")) {
                // set canvas boundaries and graphics
                StdDraw.setXscale(0, 300); // set x-axis
                StdDraw.setYscale(0, 300); // set y-axis
                //double penrad = 0.005;
                boolean isPlaying = true;
                int hs = 0; // hs = hades' score, 
                int ps = 0; // ps = persephone's score
                // Figure h = new Figure("h"); //initialize characters
                // Figure p = new Figure("p");
                double d = 0.3;
     
                // initialize Flower objects
                int numOfFlowers = 100;
                // ArrayList<Double[][]> flowers = new ArrayList<Double[][]>(numOfFlowers);
                double[][] flowers = new double[numOfFlowers][2];
                double flwidth = 3.0;
                for (int i = 0; i < numOfFlowers; i++) 
                {
                    Flower f = new Flower();
                    f.setxy();
                    flowers[i][0] = f.getx(f);
                    flowers[i][1] = f.gety(f);
                }
                boolean[] keyStates = new boolean[8]; // first four for persephone, next four for hades
                while (isPlaying) // game loop
                {
                    if (diagon) System.out.println("isPlaying");
                    // if ((h.getx(h,"r") <= p.getx(p,"l")) | (p.getx(p,"r") <= h.getx(h,"l")) |  (p.gety(p,"b") <= (h.gety(h,"t"))) | (h.gety(h,"b") <= (p.gety(p,"t")))) isPlaying = false;
     
                    if (StdDraw.hasNextKeyTyped()) {  // allow user to hold and move at the same time; now you have to press repeatedly
                        int keyTyped = StdDraw.nextKeyTyped();
                        // PERSEPHONE CONTROL = WASD, HADES CONTROL = IJKL
     
                        // keyStates indices: 0 = pu, 1 = pd, 2 = pl, 3 = pr
                        //                    4 = hu, 5 = hd, 6 = hl, 7 = hr
                                        // fix directions and hitting wall, maKE IT STOP
     
                        if (keyTyped == 119) keyStates[0] = true; // p moves up
                        else                 keyStates[0] = false;
                        if (keyTyped == 115) keyStates[1] = true; // p moves down
                        else                 keyStates[1] = false;
                        if (keyTyped == 97)  keyStates[2] = true; // p moves left
                        else                 keyStates[2] = false;
                        if (keyTyped == 100) keyStates[3] = true; // p moves right
                        else                 keyStates[3] = false;
                        if (keyTyped == 105) keyStates[4] = true; // h moves up
                        else                 keyStates[4] = false;
                        if (keyTyped == 107) keyStates[5] = true; // h moves down
                        else                 keyStates[5] = false;
                        if (keyTyped == 106) keyStates[6] = true; // h moves left
                        else                 keyStates[6] = false;
                        if (keyTyped == 108) keyStates[7] = true; // h moves right    
                        else                 keyStates[7] = false;
                    }
     
                    // double nd = d/10;
                    if (keyStates[0] && (py+5 < 300-d)) py += d; // pu
                    if (keyStates[1] && (py-5 > d)) py -= d; // pd
                    if (keyStates[2] && (px-5 > d)) px -= d; // pl
                    if (keyStates[3] && (px+5 < 300-d)) px += d; // pr
                    if (keyStates[4] && (hy+5 < 300-d)) hy += d; // hu
                    if (keyStates[5] && (hy-5 > d)) hy -= d; // hd
                    if (keyStates[6] && (hx-5 > d)) hx -= d; // hl
                    if (keyStates[7] && (hx+5 < 300-d)) hx += d; // hr
     
                    // write cases for characters intercepting each other
                    // wall bounce back function should be refined
     
     
                    // draw characters
                    StdDraw.clear(StdDraw.WHITE);
                    //StdDraw.setPenColor(StdDraw.BLACK);
                    for (int i = 0; i < numOfFlowers; i++) 
                    { //draw flowers
                        // if hx and hy touch, then dont draw the flower. draw it otherwise
                        double fx = flowers[i][0];
                        double fy = flowers[i][1];
     
                        if ( (hx-5<=fx+3) | (hx+5 >= fx-3) | (hy+5 >= fy-3) | (hy-5 <= fy+3) ){
                            fx = -5;
                            fy = -5; //get rid of flowers. was going to use arraylist but this might be the most straightfoward way
                            hs++;
                        }
     
                        if ( (px-5<=fx+3) | (px+5 >= fx-3) | (py+5 >= fy-3) | (py-5 <= fy+3) ){
                            fx = -5;
                            fy = -5;
                            ps++;
                        }
                        StdDraw.setPenColor(StdDraw.FLOWER_COLOR);
                        StdDraw.circle(flowers[i][0],flowers[i][1],flwidth);
                    }
                    StdDraw.setPenColor(StdDraw.HADES_COLOR); // draw hades
                    StdDraw.filledSquare(hx,hy,5);
                    StdDraw.setPenColor(StdDraw.PERSEPHONE_COLOR); // draw persephone
                    StdDraw.filledSquare(px,py,5);
     
     
     
                    // display characters on screen; animate
                    StdDraw.show(1);
                }
            }
        }
        /**
         * empty constructor for Game class
         */
        public Game()
        {
        } 
    }

  2. #2
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    Default Re: StdDraw keyboard controls uncontrollable

    characters move too quickly
    That is often because the moves are made in a loop and the loop runs very quickly. If the loop is not using the JVM EDT then you could add a call to the Thread sleep method to add a delay between each new position.

    I don't know anything about the Std... classes and methods and can't help with those. Is there a forum for the Std... classes where you can ask your questions?

  3. #3
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    Default Re: StdDraw keyboard controls uncontrollable

    thank you so much for that bit of advice!! i unfortunately don't know any specific Std class forums but will look online

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