javafxjavafx-8game-physics
JavaFX Game Animation How to move ImageView in X-axis and Y-axis according to angle
I want bullets to go straight to the target. I know how to change players direction according to the target location and I also know I need to decrees X-axis and Y-axis according to the angle but.. don't know how?? anyone has any idea how I can do it. Also, a target is gonna be moving down on x-axis I want target ship to go toward the player. Same problem. My Math is not that good I have no idea what kind of trigonometric approach I need to take.
There are only 2 class files with these u can run code yourself
Main.java
package bullitsrunning;
import java.util.ArrayList;
import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.Point2D;
import javafx.stage.Stage;
import javafx.util.Duration;
import javafx.scene.Scene;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.Pane;
public class Main extends Application {
private final int HEIGHT = 600, WIDTH = 600;
public static Pane root = new Pane();;
ArrayList<ImageObject> rocket_list = new ArrayList<>();
ArrayList<ImageObject> enemy_rocket_list = new ArrayList<>();
boolean up = false,down = false,left = false,right = false, rotateLeft = false, rotateRight= false;
ImageObject player = new ImageObject(300, 450, 100, 100, "alienship2.png");
ImageObject enemy = new ImageObject(100, 10, 50, 50, "animemonster.png");
@Override
public void start(Stage stage) {
try {
Timeline tl = new Timeline(new KeyFrame(Duration.millis(5), e-> {
playerUpdate();
enemyUpdate();
for(ImageObject rock : new ArrayList<ImageObject>(rocket_list)) {
rock.setLayoutY(rock.getLayoutY() - 2);
if(rock.getLayoutY() < 0) {
if(rock.getBound().intersects(enemy.getBound()))
{
//enemy.delete();
}
System.out.println(rocket_list.size());
rock.delete();
rocket_list.remove(rock);
}
}
}));
tl.setCycleCount(Animation.INDEFINITE);
tl.play();
Scene scene = new Scene(root,600,600);
scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent e)
{
switch (e.getCode()) {
case W:
up = true;
break;
case S:
down = true;
break;
case A:
left = true;
break;
case D:
right = true;
break;
case LEFT:
System.out.println("Rotate Left");
rotateLeft = true;
break;
case RIGHT:
System.out.println("Rotate Right");
rotateRight = true;
break;
case SPACE:
ImageObject io = new ImageObject(player.getX() + 38, player.getY(), 25, 25, "blackbullet.png");
rocket_list.add(io);
break;
}
}
});
scene.setOnKeyReleased(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent e)
{
switch (e.getCode()) {
case W:
up = false;
break;
case S:
down = false;
break;
case A:
left = false;
break;
case D:
right = false;
break;
case LEFT:
System.out.println("Rotate Left");
rotateLeft = false;
break;
case RIGHT:
System.out.println("Rotate Right");
rotateRight = false;
break;
}
}
});
stage.setScene(scene);
stage.show();
} catch(Exception e) {
e.printStackTrace();
}
}
private void enemyUpdate() {
for(ImageObject rock : new ArrayList<ImageObject>(enemy_rocket_list)) {
rock.setLayoutY(rock.getLayoutY() + 2);
if(rock.getLayoutY() > HEIGHT) {
System.out.println(rocket_list.size());
rock.delete();
rocket_list.remove(rock);
}
}
}
private void playerUpdate() {
Point2D ene = new Point2D(enemy.getLayoutX(), enemy.getLayoutY());
Point2D play = new Point2D(player.getLayoutX(), player.getLayoutY());
Point2D p3 = play.subtract(ene);
Point2D p4 = new Point2D(1, 0);
System.out.println( "Point2D: " + p4.angle(p3));
player.setRotate(p4.angle(p3) - 90);
System.out.println(Math.sin(p4.angle(p3)));
//So Player Can't move outside of the border
if(player.getX() < 0 ) {
player.setLayoutX(0);
} else if(player.getX() > WIDTH- player.getWidth())
{
player.setLayoutX(WIDTH - player.getWidth());
}else if(player.getY() < 0 )
{
player.setLayoutY(0);
}else if(player.getY() > HEIGHT - player.getHeight())
{
player.setLayoutY(HEIGHT - player.getHeight());
}else
{
//Player movement UP, DOWN, LEFT, RIGHT
if(up)
{
player.setLayoutY(player.getLayoutY() - 1);
}
if(down)
{
player.setLayoutY(player.getLayoutY() + 1);
}
if(left)
{
player.setLayoutX(player.getLayoutX() - 1);
}
if(right)
{
player.setLayoutX(player.getLayoutX() + 1);
}
if(rotateLeft)
{
player.setRotate(120 - 90);
}
if(rotateLeft)
{
player.setRotate(60 - 90);
}
}
}
public static void main(String[] args) {
launch(args);
}
}
ImageObject.java
package bullitsrunning;
import javafx.geometry.Bounds;
import javafx.scene.image.ImageView;
public class ImageObject {
private String folder_location ="File:Images/";
private ImageView image_view;
private boolean alive = true;
public ImageObject(double x,double y,double w,double h,String image)
{
image_view = new ImageView(folder_location+image);
image_view.setCache(true); //help in performance
image_view.setFitHeight(h );
image_view.setFitWidth(w);
image_view.setLayoutX(x);
image_view.setLayoutY(y);
image_view.setSmooth(true);
Main.root.getChildren().add(image_view);
}
public double getX(){
return image_view.getLayoutX();
}
public double getY() {
return image_view.getLayoutY();
}
public void setRotate(double rot) {
image_view.setRotate(rot);
}
public double getHeight()
{
return image_view.getFitHeight();
}
public double getWidth()
{
return image_view.getFitWidth();
}
public void setHeight(double h)
{
image_view.setFitHeight(h);
}
public void setWidth(double w)
{
image_view.setFitWidth(w);
}
public void setSize(double h,double w)
{
image_view.setFitHeight(h);
image_view.setFitWidth(w);
}
//Axis
public double getLayoutX()
{
return image_view.getLayoutX();
}
public double getLayoutY()
{
return image_view.getLayoutY();
}
public void setLayoutX(double x)
{
image_view.setLayoutX(x);
}
public void setLayoutY(double y)
{
image_view.setLayoutY(y);
}
public void setPos(double x,double y)
{ image_view.setLayoutX(x);
image_view.setLayoutY(y);
}
public Bounds getBound()
{
return image_view.getBoundsInParent();
}
public ImageView getView()
{
return image_view;
}
public void delete()
{
Main.root.getChildren().remove(image_view);
}
public boolean isAlive() {
return alive;
}
public void setAlive(boolean alive) {
this.alive = alive;
}
}
Solution
I don't know JavaFX and I don't go into your implementation details. But the core idea is as follows:
You need to create a direction vector from the source location (current player location) to the destination (the enemy, I guess) as:
direction = new Vector()
direction.x = des.x-src.x;
direction.y = des.y-src.y;
Now you should normalize the vector like:
double direction_magnitude = Math.sqrt(direction.x*direction.x + direction.y*direction.y)
direction.x = direction.x/direction_magnitude;
direction.y = direction.y/direction_magnitude;
Now just update the player location gradually according to the direction vector like:
void update(float deltaTime) {
// recalculate `direction` if your destination is moving
player.x = player.x + (direction.x * deltaTime);
player.y = player.y + (direction.y * deltaTime);
player.rotation = Math.atan2(direction.y, direction.x)
}
The very last line rotates the player facing toward the destination (learn more about this line here).
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