[英]LibGDX draw line
I'm trying to make something like a slingshot using libGDX. 我正在尝试使用libGDX制作类似弹弓的东西。
My code 我的代码
if (Gdx.input.isTouched()) {
ShapeRenderer sr = new ShapeRenderer();
sr.setColor(Color.BLACK);
sr.setProjectionMatrix(camera.combined);
sr.begin(ShapeType.Line);
sr.line(player.getLeft().x, player.getLeft().y,
Global.game_touch_position.x, Global.game_touch_position.y);
sr.line(player.getRight().x, player.getRight().y,
Global.game_touch_position.x, Global.game_touch_position.y);
sr.end();
}
Doing this i will have the output 这样做我将得到输出
This looks awful, and if I debug on my android phone , the logcat is spammed by the message
这看起来很糟糕,如果我在我的Android手机上调试,logcat会被邮件发送垃圾邮件
02-17 18:55:27.371: D/dalvikvm(7440): GC_CONCURRENT freed 1884K, 40% free 8287K/13635K, paused 15ms+2ms, total 40ms
And lags, I have like 30 fps when i touch the screen , and 60 when i don't... 并且滞后,当我触摸屏幕时,我有30 fps,而当我不触摸时,我有60 fps ...
I also need to draw the line with a little bit of thickness, so when the line is bigger, i will have to make it thicker, to give a cool look. 我还需要绘制一点厚度的线条,所以当线条更大时,我必须使它更厚,以给出一个很酷的外观。
Which is the best way to draw a simple line in libgdx ? 在libgdx中绘制简单线条的最佳方法是哪种? If I won't find any answer probably i'm going to draw circles from a point of the line to the other..this would look ok , but won't look like a slingshot...
如果我找不到任何答案,我可能会从一条线到另一条线画圆圈。这样看起来不错,但看起来不像弹弓......
Any help? 有帮助吗?
I just have something like this in a helper or utils class. 我只是在helper或utils类中有这样的东西。 I usually use it for debugging and visualizing whats going on.
我通常用它来调试和可视化最新进展。
private static ShapeRenderer debugRenderer = new ShapeRenderer();
public static void DrawDebugLine(Vector2 start, Vector2 end, int lineWidth, Color color, Matrix4 projectionMatrix)
{
Gdx.gl.glLineWidth(lineWidth);
debugRenderer.setProjectionMatrix(projectionMatrix);
debugRenderer.begin(ShapeRenderer.ShapeType.Line);
debugRenderer.setColor(color);
debugRenderer.line(start, end);
debugRenderer.end();
Gdx.gl.glLineWidth(1);
}
public static void DrawDebugLine(Vector2 start, Vector2 end, Matrix4 projectionMatrix)
{
Gdx.gl.glLineWidth(2);
debugRenderer.setProjectionMatrix(projectionMatrix);
debugRenderer.begin(ShapeRenderer.ShapeType.Line);
debugRenderer.setColor(Color.WHITE);
debugRenderer.line(start, end);
debugRenderer.end();
Gdx.gl.glLineWidth(1);
}
Now I can easily draw a line from anywhere I like on any projection matrix I want. 现在,我可以在任何我喜欢的任何投影矩阵上轻松地绘制一条线。
HelperClass.DrawDebugLine(new Vector2(0,0), new Vector2(100,100), camera.combined);
You want to draw outside the other SpriteBatch
begin and end. 你想在其他
SpriteBatch
之外绘制开始和结束。 And if you want to make a lot of lines each frame you are better off beginning and ending the ShapeRenderer in a separate static method or make it public and do it yourself depending on your needs. 如果你想在每一帧中制作很多行,你最好在一个单独的静态方法中开始和结束ShapeRenderer,或者将它公开并根据你的需要自己做。
Obviously you can create more methods for more shapes or more overloads. 显然,您可以为更多形状或更多重载创建更多方法。
您可以通过调用Gdx.gl10.glLineWidth(width_in_pixels)
来设置线条粗细。
ShapeRenderer has a method called rectLine() that draws a line with a specified thickness. ShapeRenderer有一个名为rectLine()的方法,它绘制一条具有指定厚度的线。 It is exactly what you're looking for with your line thickness question.
正是您正在寻找的线厚度问题。 You will also want to change sr.begin(ShapeType.Line) to sr.begin(ShapeType.Filled)
您还需要将sr.begin(ShapeType.Line)更改为sr.begin(ShapeType.Filled)
if (Gdx.input.isTouched()) {
ShapeRenderer sr = new ShapeRenderer();
sr.setColor(Color.BLACK);
sr.setProjectionMatrix(camera.combined);
sr.begin(ShapeType.Filled);
sr.rectLine(player.getLeft().x, player.getLeft().y,
Global.game_touch_position.x, Global.game_touch_position.y, desired_thickness);
sr.rectLine(player.getRight().x, player.getRight().y,
Global.game_touch_position.x, Global.game_touch_position.y, desired_thickness);
sr.end();
}
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