1 files changed, 102 insertions, 0 deletions
diff --git a/src/ru/olamedia/olacraft/render/jogl/PlaneRenderer.java b/src/ru/olamedia/olacraft/render/jogl/PlaneRenderer.java
new file mode 100644
index 0000000..754a093
--- /dev/null
+++ b/src/ru/olamedia/olacraft/render/jogl/PlaneRenderer.java
@@ -0,0 +1,102 @@
+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) {
+		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();
+			}
+		}
+	}
+}