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package ru.olamedia.olacraft.render.jogl;
import javax.media.opengl.GL2;
import javax.media.opengl.GLAutoDrawable;
import ru.olamedia.math.Plane;
public class PlaneRenderer {
private static float getZ(Plane p, float x, float y) {
return -(p.n.x * x + p.n.y * y + p.d) / p.n.z;
}
private static float getY(Plane p, float x, float z) {
return -(p.n.x * x + p.n.z * z + p.d) / p.n.y;
}
private static float getX(Plane p, float y, float z) {
return -(p.n.y * y + p.n.z * z + p.d) / p.n.x;
}
public static void render(Plane p, GLAutoDrawable drawable) {
if (true){
return;
}
GL2 gl = drawable.getGL().getGL2();
float size = 100;
float step = size / 5;
for (float x = -size; x <= size; x += step) {
for (float y = -size; y <= size; y += step) {
// nx * x + ny * y + nz * z + d = 0
// (z = nx * x + ny * y + d) / nz
float z = getZ(p, x, y);
float x2 = x + step;
float y2 = y;
float z2 = getZ(p, x2, y2);
float x3 = x + step;
float y3 = y + step;
float z3 = getZ(p, x3, y3);
float x4 = x;
float y4 = y + step;
float z4 = getZ(p, x4, y4);
gl.glPolygonMode(GL2.GL_FRONT_AND_BACK, GL2.GL_LINE);
gl.glBegin(GL2.GL_QUADS);
{
gl.glVertex3f(x, y, z);
gl.glVertex3f(x2, y2, z2);
gl.glVertex3f(x3, y3, z3);
gl.glVertex3f(x4, y4, z4);
}
gl.glEnd();
}
}
for (float x = -size; x <= size; x += step) {
for (float z = -size; z <= size; z += step) {
// nx * x + ny * y + nz * z + d = 0
// (z = nx * x + ny * y + d) / nz
float y = getY(p, x, z);
float x2 = x + step;
float z2 = z;
float y2 = getY(p, x2, z2);
float x3 = x + step;
float z3 = z + step;
float y3 = getY(p, x3, z3);
float x4 = x;
float z4 = z + step;
float y4 = getY(p, x4, z4);
gl.glPolygonMode(GL2.GL_FRONT_AND_BACK, GL2.GL_LINE);
gl.glBegin(GL2.GL_QUADS);
{
gl.glVertex3f(x, y, z);
gl.glVertex3f(x2, y2, z2);
gl.glVertex3f(x3, y3, z3);
gl.glVertex3f(x4, y4, z4);
}
gl.glEnd();
}
}
for (float y = -size; y <= size; y += step) {
for (float z = -size; z <= size; z += step) {
// nx * x + ny * y + nz * z + d = 0
// (z = nx * x + ny * y + d) / nz
float x = getX(p, y, z);
float y2 = y + step;
float z2 = z;
float x2 = getX(p, y2, z2);
float y3 = y + step;
float z3 = z + step;
float x3 = getX(p, y3, z3);
float y4 = y;
float z4 = z + step;
float x4 = getX(p, y4, z4);
gl.glPolygonMode(GL2.GL_FRONT_AND_BACK, GL2.GL_LINE);
gl.glBegin(GL2.GL_QUADS);
{
gl.glVertex3f(x, y, z);
gl.glVertex3f(x2, y2, z2);
gl.glVertex3f(x3, y3, z3);
gl.glVertex3f(x4, y4, z4);
}
gl.glEnd();
}
}
}
}
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