2014-03-06 57 views
1

我正在尝试使窗口展开时,其中的对象保持大小。调整窗口大小时的Java OpenGL 3D对象不保持大小

我绘制的顶部2D图像(图片中的白色图标)在调整大小,保持大小和位置时工作得很好,而首先绘制的3D无法保持大小和位置。

这里是我的投影矩阵功能:

public static FloatMatrix getPerspectiveMatrix(
    Double fov, float w, float h, float near, float far 
){ 
    float asp = w/h; 
    float fov_cos = (float) Math.cos(fov/2.0d); 
    float fov_sin = (float) Math.sin(fov/2.0d); 
    float fov_cot = fov_cos/fov_sin; 
    float a_0 = fov_cot/asp; 
    float a_3 = (far + near)/(near-far); 
    float a_43 = (2.0f * far * near)/(near-far); 
    float[] an = { 
      a_0, 0.0f, 0.0f, 0.0f, 
      0.0f, fov_cot, 0.0f, 0.0f, 
      0.0f, 0.0f, a_3, -1.0f, 
      0.0f, 0.0f, a_43, 0.0f, 
    }; 
    return new FloatMatrix(an, 4, 4); 

} 

这是我得到的矩阵在我的渲染功能:

FloatMatrix proj = FloatMatrix.getPerspectiveMatrix(
    Math.PI/2.0d, this.width, this.height, 0.1f, 200.0f 
); 

正交矩阵:

public static FloatMatrix getOrtographicMatrix(
    float left, float right, float bottom, float top, float near, float far 
){ 
    float a_0 = 2.0f/(right - left); 
    float a_22 = 2/(top - bottom); 
    float a_33 = -2/(far - near); 
    float tx = -(right + left)/(right - left); 
    float ty = -(top + bottom)/(top - bottom); 
    float tz = -(far + near)/(far - near); 
    float[] an = { 
     a_0, 0.0f, 0.0f, 0.0f, 
     0.0f, a_22, 0.0f, 0.0f, 
     0.0f, 0.0f, a_33, 0.0f, 
     tx, ty, tz, 1.0f 
    }; 
    return new FloatMatrix(an, 4, 4); 

} 

我在渲染如何获得奥托:

FloatMatrix.getOrtographicMatrix(
-this.width/30.0f, this.width/30.0f, -this.height/30.0f, this.height/30.0f, 1.0f, 1.1f 
); 

图片示例:

较小的512×512

Smaller 512x512

全屏幕(1080)

Full Screen (1080)

回答

1

我已经找到了答案。 它有因与FOV(视野)

h0 = original height of the window 
h1 = new height of the window 
fov0 = original field of view 
fov1 = new field of view 

fov1 = atan(tan(fov0/2.0) * h1/h0) * 2.0; 

Source

你会把这个reshape()功能由GLEventListener当GLCanvas中的大小时调用。

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