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JOGL resize a figure without distorting

Previously we how to draw a hexagon, octagon and a circle with JOGL but never resize the frame that contained them. The reason? it because we had not modified the method reshape () interface used by GLEventListener , then, to resize a frame may be that our figures are distorted as shown in this image:

deformed circle to resize the JFrame.

To prevent this, we must modify the code contained within the method reshape () as follows:

public void reshape ( GLAutoDrawable drawable, int x, int and int width, int height) {

/ / Load the projection of our image
gl . glMatrixMode (GL.GL_PROJECTION)
gl.glLoadIdentity ();

/ / When the height is larger than the width
if (w \u0026lt;= h) {

/ / Update the background (bottom ) and top (top) of
/ / so as not to warp our picture
gl.glOrtho (-xrange, xrange, yrange
-* ((float) h / (float) w) yrange * ((float) h / (float) w)-zRange, zRange)

} / / When the width is bigger than the high

else {
/ / Update the left side (left ) and the right side (right) of
/ / so as not to warp our picture
gl.glOrtho (-xrange * ((float) w / (float) h), xrange * ((float) w / (float) h),
-yrange, yrange, "zRange, zRange);}

/ / Load the model view
/ / with the new dimensions (width, height)
gl . glMatrixMode (GL.GL_MODELVIEW)
gl.glViewport (x, y, width, height);
/ / redraw the object
canvas.repaint ();}


As can be seen in the previous method, we used three new variables: xrange, yrange, zRange, these variables define our work space and must be declared and initialized in the constructor of our program

float xrange = 5.0f;
float yrange = 5.0f;
zRange float = 5.0f;

With this, our space Work will continue to comprise the ranges:

• x = [-5.5]
• y = [-5.5]
• z = [-5.5]

method reshape receives as parameters four variables:

1. GLAutodrawable
2. int drawable x
3. and
int int
5. int width height

These variables define the new dimensions of our object content in GLCanvas and it is necessary to manipulate the final shape is not deformed. Thus, when resizing the frame that contains the figure, no matter if the width or height increases, the figure shown within the object GLCanvas remain undistorted as shown in the following figures:







If you wish to download the source code you can click on the following link: Download

dibujarCircunferenciaNODeforme.java source

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