Java LibGDX 画线
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LibGDX draw line
提问by Boldijar Paul
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
This looks awful, and if I debug on my android phone , the logcat is spammed by the message
这样做我会得到输出
这看起来很糟糕，如果我在我的 android 手机上调试，logcat 会被消息发送垃圾邮件
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，当我不触摸时有 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.
我还需要画一点粗细的线条，所以当线条变大时，我必须把它变粗，看起来很酷。
Which is the best way to draw a simple line in libgdx ? 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...
在 libgdx 中绘制简单线条的最佳方法是什么？如果我找不到任何答案，我可能会从线的一点到另一点画圆圈......这看起来不错，但看起来不像弹弓......
Any help?
有什么帮助吗？
采纳答案by Madmenyo
I just have something like this in a helper or utils class. I usually use it for debugging and visualizing whats going on.
我只是在 helper 或 utils 类中有这样的东西。我通常用它来调试和可视化正在发生的事情。
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.
现在我可以轻松地从我喜欢的任何投影矩阵上的任何地方画一条线。
HelperClass.DrawDebugLine(new Vector2(0,0), new Vector2(100,100), camera.combined);
You want to draw outside the other SpriteBatchbegin and end. 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.
您想在其他SpriteBatch开始和结束之外绘制。如果您想在每一帧中制作很多行，最好在单独的静态方法中开始和结束 ShapeRenderer，或者将其公开并根据您的需要自行完成。
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。
回答by desertkun
You could set line thickness by calling Gdx.gl10.glLineWidth(width_in_pixels).
您可以通过调用设置线条粗细Gdx.gl10.glLineWidth(width_in_pixels)。
回答by Eric Christensen
ShapeRenderer has a method called rectLine() that draws a line with a specified thickness. It is exactly what you're looking for with your line thickness question. You will also want to change sr.begin(ShapeType.Line) to sr.begin(ShapeType.Filled)
ShapeRenderer 有一个名为 rectLine() 的方法，它可以绘制一条具有指定粗细的线。这正是您正在寻找的线宽问题。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();
}
