Java tutorial
/** * ion2d * * Copyright (C) 2010 Vantage Technic * * This program is free software; you can redistribute it and/or modify * it under the terms of the 'ion2d' license. * * You will find a copy of this license within the ion2d * distribution inside the "LICENSE" file. */ package ion2d; import ion2d.support.INTypes.*; import org.lwjgl.opengl.*; import java.nio.*; import java.awt.Dimension; import org.lwjgl.BufferUtils; public class INTiledGrid3D extends INGridBase { protected FloatBuffer vertices; protected FloatBuffer originalVertices; protected FloatBuffer textureCoordinates; protected IntBuffer indices; protected int totalQuads; /** * Default constructor * @throws Exception */ public INTiledGrid3D() throws Exception { this(new GridSize(10, 10)); } /** * Secondary Constructor * @param CCGridSize size * @throws Exception */ public INTiledGrid3D(GridSize size) throws Exception { super(size); this.totalQuads = size.x * size.y; //Allocate enough space in the float buffer for storing the vertices //Size of float buffer should be X+1 * Y+1 * 3 //We multiple by 3 to account for each vertex x, y, and z this.vertices = BufferUtils.createFloatBuffer(this.totalQuads * 12); this.originalVertices = BufferUtils.createFloatBuffer(this.vertices.limit()); //Same thing for texture coordinates but times 2 instead this.textureCoordinates = BufferUtils.createFloatBuffer(this.totalQuads * 8); //Allocate enough space for the indices this.indices = BufferUtils.createIntBuffer(this.totalQuads * 36); this.calculateVertexPoints(); } /** * Copy constructor * @param CCTileGrid3D original */ public INTiledGrid3D(INTiledGrid3D original) throws Exception { if (original == null) throw new NullPointerException(); this.active = original.active; this.grabber = original.grabber.clone(); this.gridSize = original.gridSize.clone(); this.indices = BufferUtils.createIntBuffer(original.indices.limit()); this.indices.put(original.indices); this.originalVertices = BufferUtils.createFloatBuffer(original.originalVertices.limit()); this.originalVertices.put(original.originalVertices); this.reuseGrid = original.reuseGrid; this.step = original.step.clone(); this.texture = original.texture.clone(); this.textureCoordinates = BufferUtils.createFloatBuffer(original.textureCoordinates.limit()); this.textureCoordinates.put(original.textureCoordinates); this.totalQuads = original.totalQuads; this.vertices = BufferUtils.createFloatBuffer(original.vertices.limit()); this.vertices.put(original.vertices); } /** * Clone Override * @return CCTileGrid3D */ public INTiledGrid3D clone() { try { return new INTiledGrid3D(this); } catch (Exception e) { System.out.println(e.getMessage()); e.printStackTrace(); return null; } } /** * Draws the Grid3D to the output */ public void blit() { // Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY // Needed states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_TEXTURE_COORD_ARRAY // Unneeded states: GL_COLOR_ARRAY GL11.glDisableClientState(GL11.GL_COLOR_ARRAY); GL11.glVertexPointer(3, 0, this.vertices); GL11.glTexCoordPointer(2, 0, this.textureCoordinates); GL11.glDrawElements(GL11.GL_QUADS, this.indices); //Restore GL Default State GL11.glEnableClientState(GL11.GL_COLOR_ARRAY); } /** * Calculates the vertex positions for the grid */ protected void calculateVertexPoints() { int x, y; Dimension pixelSize = this.texture.getImageSize(); for (x = 0; x < this.gridSize.x; x++) { for (y = 0; y < this.gridSize.y; y++) { float x1 = x * this.step.x; float x2 = x1 + this.step.x; float y1 = y * this.step.y; float y2 = y1 + this.step.y; this.vertices.put(x1); this.vertices.put(y1); this.vertices.put(0); this.vertices.put(x2); this.vertices.put(y1); this.vertices.put(0); this.vertices.put(x1); this.vertices.put(y2); this.vertices.put(0); this.vertices.put(x2); this.vertices.put(y2); this.vertices.put(0); float ax = x1 / pixelSize.width; float bx = x2 / pixelSize.width; float ay = y1 / pixelSize.height; float by = y2 / pixelSize.height; this.textureCoordinates.put(ax); this.textureCoordinates.put(ay); this.textureCoordinates.put(bx); this.textureCoordinates.put(ay); this.textureCoordinates.put(ax); this.textureCoordinates.put(by); this.textureCoordinates.put(bx); this.textureCoordinates.put(by); } } for (x = 0; x < this.totalQuads; x++) { this.indices.put(x * 6, x * 4); this.indices.put(x * 6 + 1, x * 4 + 1); this.indices.put(x * 6 + 2, x * 4 + 2); this.indices.put(x * 6 + 3, x * 4 + 1); this.indices.put(x * 6 + 4, x * 4 + 2); this.indices.put(x * 6 + 5, x * 4 + 3); } this.vertices.rewind(); this.textureCoordinates.rewind(); this.originalVertices.put(this.vertices); } /** * Gets the Quad from the specified x,y position * @param Vertex2F position * @return Quad3 */ public Quad3 getTile(Vertex2F position) { int index = Math.round(this.gridSize.y * position.x + position.y) * 12; Vertex3F bl = new Vertex3F(this.vertices.get(index), this.vertices.get(index + 1), this.vertices.get(index + 2)); Vertex3F br = new Vertex3F(this.vertices.get(index + 3), this.vertices.get(index + 4), this.vertices.get(index + 5)); Vertex3F tl = new Vertex3F(this.vertices.get(index + 6), this.vertices.get(index + 7), this.vertices.get(index + 8)); Vertex3F tr = new Vertex3F(this.vertices.get(index + 9), this.vertices.get(index + 10), this.vertices.get(index + 11)); Quad3 quad = new Quad3(tl, tr, bl, br); return quad; } /** * Gets the original Quad from the specified x, y position * @param Vertex2F position * @return Quad3 */ public Quad3 getOriginalTile(Vertex2F position) { int index = Math.round(this.gridSize.y * position.x + position.y) * 12; Vertex3F bl = new Vertex3F(this.originalVertices.get(index), this.originalVertices.get(index + 1), this.originalVertices.get(index + 2)); Vertex3F br = new Vertex3F(this.originalVertices.get(index + 3), this.originalVertices.get(index + 4), this.originalVertices.get(index + 5)); Vertex3F tl = new Vertex3F(this.originalVertices.get(index + 6), this.originalVertices.get(index + 7), this.originalVertices.get(index + 8)); Vertex3F tr = new Vertex3F(this.originalVertices.get(index + 9), this.originalVertices.get(index + 10), this.originalVertices.get(index + 11)); Quad3 quad = new Quad3(tl, tr, bl, br); return quad; } /** * Sets the Quad at the given position * @param Vertex2F position * @param Quad3 tile */ public void setTile(Vertex2F position, Quad3 tile) { int index = Math.round(this.gridSize.y * position.x + position.y) * 12; this.vertices.put(index, tile.bl.x); this.vertices.put(index + 1, tile.bl.y); this.vertices.put(index + 2, tile.bl.z); this.vertices.put(index + 3, tile.br.x); this.vertices.put(index + 4, tile.br.y); this.vertices.put(index + 5, tile.br.z); this.vertices.put(index + 6, tile.tl.x); this.vertices.put(index + 7, tile.tl.y); this.vertices.put(index + 8, tile.tl.z); this.vertices.put(index + 9, tile.tr.x); this.vertices.put(index + 10, tile.tr.y); this.vertices.put(index + 11, tile.tr.z); } /** * Reset the vertices position to the original state */ public void reuse() { if (this.reuseGrid > 0) { this.vertices.clear(); this.originalVertices.rewind(); this.vertices.put(this.originalVertices); this.reuseGrid--; } } }