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Ramosaurio
Asked: 2020-08-13 18:12:52 +0800 CST 2020-08-13 18:12:52 +0800 CST

Rotate Rectangle with LibGDX

  • 772

I am making a test program that consists of:

  • 4 buttons, up, down, left and right.
  • A spaceship, formed by a Rectangle ( Rectangle) and its respective image ( Texture).

Boton arriba,moves up

Boton abajo, it moves down.

Boton izquierdo, rotates counterclockwise on itself Boton derecho, rotates clockwise on itself

I can't find any method to make the right and left button work. Thanks in advance.

android

2 Answers

  1. Best Answer

    You can also use the class Polygoninstead ofRectangle

    Unlike the rectangle, the polygon is defined according to its vertices: enter image description here

    Polygon polygono = new Polygon(new float[]{
                rect.x, rect.y,                                 //vertice A
                rect.x, rect.y + rect.height,                   //vertice B
                rect.x + rect.width, rect.y + rect.height,     //vertice C
                rect.x + rect.width, rect.y                    //vertice D
            });


botonIzquierdo.addListener(new InputListener(){
    @Override
    public boolean touchDown(InputEvent event, float x, float y,
                    int pointer, int button) {

        polygono.rotate(5);
        return super.touchDown(event, x, y, pointer, button);
    }
});

    In render();

    shapeRenderer.begin();
shapeRenderer.setColor(Color.red);
shapeRenderer.polygon(polygono.getTransformedVertices());
shapeRenderer.end();
    • 2

  2. Well I managed to see how to solve this simple error.

    If we create the Rectanglewe will not be able to manipulate it much, we should create a ShapeRender: We create four points

    float shapeX = new float[4];
float shapeY = new float[4];

    and now in ourvoid draw()

    shapeX[0] = x + MathUtils.cos(radians);
shapeY[0] = x + MathUtils.sin(radians);

    We give value to radians, to the main point I give pi/2, and we are already adding its respective angle to each point. We do this with each point of the array.

    • 1