所以我的目标是画一个类似于这个样条的样条线(线穿过每个点):
但是样条曲线循环(从终点2回到起点):
我尝试改变"连续" catmullromspline中的布尔值,但这导致只在屏幕中心绘制一个点。
当它到达最后一点时我也结束了线条画,但结果很难看,因为线条在起点和终点仍然弯曲。
我在源代码中到处查找,找不到可以阻止它循环的函数。
据我所知,bezier splines不会通过所有点(他们只能通过他们附近)。
那我该怎么办?
这是我的代码:
...
public class GameScreen implements Screen {
final game game;
float w=800;
float h=480;
OrthographicCamera camera;
long startTime;
Texture baseTexture=new Texture(Gdx.files.internal("white.png"));
public GameScreen(final game gam) {
this.game = gam;
startTime = TimeUtils.millis();
camera = new OrthographicCamera();
camera.setToOrtho(false, w, h);
setup();
}
//https://github.com/libgdx/libgdx/wiki/Path-interface-&-Splines
int k = 10000; //increase k for more fidelity to the spline
Vector2[] points = new Vector2[k];
Vector2 cp[] = new Vector2[]{
new Vector2(w/2, h), new Vector2(w/2, h/2),new Vector2(50, 50)
};
ShapeRenderer rope=new ShapeRenderer();
public void setup(){
CatmullRomSpline<Vector2> myCatmull = new CatmullRomSpline<Vector2>( cp, true);
for(int i = 0; i < k; ++i)
{
points[i] = new Vector2();
myCatmull.valueAt(points[i], ((float)i)/((float)k-1));
}
}
@Override
public void render(float delta) {
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
Gdx.gl20.glLineWidth(50);
game.batch.begin();
rope.setAutoShapeType(true);
rope.begin();
for(int i = 0; i < k-1; ++i)
{
//rope.line(points[i], points[i+1]);
//shaper.line(myCatmull.valueAt(points[i], ((float)i)/((float)k-1)), myCatmull.valueAt(points[i+1], ((float)i)/((float)k-1)));
game.batch.draw(baseTexture, points[i].x, points[i].y, 5, 5);
}
rope.end();
for(int i=0;i<cp.length;i++){//draw the location of each point
game.font.draw(game.batch, "point "+i, cp[i].x, cp[i].y);
}
//logging systems
for(int i=0;i<20;i++){
if(Gdx.input.isTouched(i))
game.font.draw(game.batch, "x:"+Gdx.input.getX(i)+" y:"+Gdx.input.getY(i), 0, (game.font.getCapHeight()+10)*(i+1));
}
game.font.draw(game.batch, "fps:"+Gdx.graphics.getFramesPerSecond()+" log:"+log, 0, h-game.font.getCapHeight());
game.batch.end();
}
...