libGDX

以点、线段、三角形为图元#xff0c;没有提供绘制圆形的接口。

要绘制圆形边框#xff0c;必须通过割圆法逼近圆形使用Mesh绘制矩形

libGDX

以点、线段、三角形为图元没有提供绘制圆形的接口。

要绘制圆形边框必须通过割圆法逼近圆形要绘制圆形的内部必须通过三角形逼近圆形如下图是通过

GL_TRIANGLE_FAN

com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;

import

com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;public

class

{Lwjgl3ApplicationConfiguration

config

Lwjgl3ApplicationConfiguration();config.setForegroundFPS(60);config.setTitle(Circle);new

Circle(),

com.badlogic.gdx.ApplicationAdapter;

import

com.badlogic.gdx.graphics.GL30;

import

com.badlogic.gdx.graphics.Mesh;

import

com.badlogic.gdx.graphics.VertexAttribute;

import

com.badlogic.gdx.graphics.VertexAttributes.Usage;

import

com.badlogic.gdx.graphics.glutils.ShaderProgram;public

class

{initShader();initMesh();}Overridepublic

void

1.0f);Gdx.gl.glClear(GL30.GL_COLOR_BUFFER_BIT);mShaderProgram.bind();mShaderProgram.setUniformf(u_wh_ratio,

mRatio);mMesh.render(mShaderProgram,

绘制圆形内部//

{mShaderProgram.dispose();mMesh.dispose();}private

void

Gdx.files.internal(shaders/circle_vertex.glsl).readString();String

fragment

Gdx.files.internal(shaders/circle_fragment.glsl).readString();mShaderProgram

new

Gdx.graphics.getHeight();}private

void

getIndices(num);VertexAttribute

vertexPosition

VertexAttribute(Usage.Position,

a_position);mMesh

vertexPosition);mMesh.setVertices(vertices);mMesh.setIndices(indices);}private

float[]