【IT168 技术文档】手机上实现任意角度翻转算法
web2.0package rorate; import javax.microedition.lcdui.Graphics; / * 图片任意角度翻转算法 * 同时实现了Nokia特有API * author. BB * Sprite.java * * */ public class Sprite { /** SIN TABLE **/ public final static int SIN_TABLE[] = { 0, 4, 8, 13, 17, 22, 26, 31, 35, 39, 44, 48, 53, 57, 61, 65, 70, 74, 78, 83, 87, 91, 95, 99, 103, 107, 111, 115, 119, 123, 127, 131, 135, 138, 142, 146, 149, 153, 156, 160, 163, 167, 170, 173, 177, 180, 183, 186, 189, 192, 195, 198, 200, 203, 206, 208, 211, 213, 216, 218, 220, 223, 225, 227, 229, 231, 232, 234, 236, 238, 239, 241, 242, 243, 245, 246, 247, 248, 249, 250, 251, 251, 252, 253, 253, 254, 254, 254, 254, 254, 255, 254, 254, 254, 254, 254, 253, 253, 252, 251, 251, 250, 249, 248, 247, 246, 245, 243, 242, 241, 239, 238, 236, 234, 232, 231, 229, 227, 225, 223, 220, 218, 216, 213, 211, 208, 206, 203, 200, 198, 195, 192, 189, 186, 183, 180, 177, 173, 170, 167, 163, 160, 156, 153, 149, 146, 142, 138, 135, 131, 127, 123, 119, 115, 111, 107, 103, 99, 95, 91, 87, 83, 78, 74, 70, 65, 61, 57, 53, 48, 44, 39, 35, 31, 26, 22, 17, 13, 8, 4, 0, -4, -8, -13, -17, -22, -26, -31, -35, -39, -44, -48, -53, -57, -61, -65, -70, -74, -78, -83, -87, -91, -95, -99, -103, -107, -111, -115, -119, -123, -127, -131, -135, -138, -142, -146, -149, -153, -156, -160, -163, -167, -170, -173, -177, -180, -183, -186, -189, -192, -195, -198, -200, -203, -206, -208, -211, -213, -216, -218, -220, -223, -225, -227, -229, -231, -232, -234, -236, -238, -239, -241, -242, -243, -245, -246, -247, -248, -249, -250, -251, -251, -252, -253, -253, -254, -254, -254, -254, -254, -255, -254, -254, -254, -254, -254, -253, -253, -252, -251, -251, -250, -249, -248, -247, -246, -245, -243, -242, -241, -239, -238, -236, -234, -232, -231, -229, -227, -225, -223, -220, -218, -216, -213, -211, -208, -206, -203, -200, -198, -195, -192, -189, -186, -183, -180, -177, -173, -170, -167, -163, -160, -156, -153, -149, -146, -142, -138, -135, -131, -127, -123, -119, -115, -111, -107, -103, -99, -95, -91, -87, -83, -78, -74, -70, -65, -61, -57, -53, -48, -44, -39, -35, -31, -26, -22, -17, -13, -8, -4 }; /** 透明 **/ public static int TRANSPARENT = 0; /** 不透明 **/ public static int OPAQUE = 15; /** * 像素值 * 包含动画帧，主下标标识动画帧数，副下标的值代表像素值 */ public short pixels[][]; /* * 精灵的宽度 * 该版本默认精灵各个帧的宽度一样大小 */ public short width; /* * 精灵的高度 * 该版本默认精灵各个帧的高度一样大小 */ public short height; /* * 动画帧数 */ public byte numOfFrame; /* * 当前动画帧数 */ public int curFrame; /* * 构造函数 * 确保传入的各个值为合理的值 * 使用的话请自己做判断 * @param _pixels 动画的像素值 * @param _width 宽度 * @param _height 高度 */ public Sprite(short[][] _pixels, short _width, short _height){ pixels = _pixels; width = _width; height = _height; numOfFrame = (byte)_pixels.length; curFrame = 0; } /* * 构造函数 */ public Sprite(){ } /* * 投影 * @param cData * @param l * @param i1 * @param j1 * @param k1 * @return */ private final short project(short cData[], int l, int i1, int j1, int k1) { int j3 = (j1 & 0xffff) >> 8; int k3 = (k1 & 0xffff) >> 8; int l3 = (256 - j3) * (256 - k3); int i4 = j3 * (256 - k3); int j4 = (256 - j3) * k3; int k4 = j3 * k3; int l2 = j1 >> 16; int i3 = k1 >> 16; l2 %= l; i3 %= i1; i3 *= l; short word0 = cData[l2 + i3]; short word2 = cData[(l2 + (i3 + l)) % (cData.length - 1)]; l2 = ++l2 % l; short word1 = cData[l2 + i3]; short word3 = cData[(l2 + (i3 + l)) % (cData.length - 1)]; int l1 = word0 >> 12 & 0xf; int i2 = word1 >> 12 & 0xf; int j2 = word2 >> 12 & 0xf; int k2 = word3 >> 12 & 0xf; int k5 = l1 * l3 + i2 * i4 + j2 * j4 + k2 * k4 >> 16; l1 = word0 >> 8 & 0xf; i2 = word1 >> 8 & 0xf; j2 = word2 >> 8 & 0xf; k2 = word3 >> 8 & 0xf; int l4 = l1 * l3 + i2 * i4 + j2 * j4 + k2 * k4 >> 16; l1 = word0 >> 4 & 0xf; i2 = word1 >> 4 & 0xf; j2 = word2 >> 4 & 0xf; k2 = word3 >> 4 & 0xf; int i5 = l1 * l3 + i2 * i4 + j2 * j4 + k2 * k4 >> 16; l1 = word0 & 0xf; i2 = word1 & 0xf; j2 = word2 & 0xf; k2 = word3 & 0xf; int j5 = l1 * l3 + i2 * i4 + j2 * j4 + k2 * k4 >> 16; return (short) ((k5 << 12) + (l4 << 8) + (i5 << 4) + j5); } /* * 翻转 * @param count 在360度内翻转的个数 * @return 返回一个翻转后的精灵 */ public Sprite rotate(int count) { Sprite sprite = new Sprite(); short radius = 30; if (width == 40 && height == 40) radius = 57; else if (width == 8 && height == 8) radius = 12; else if (width == 6 && height == 12) radius = 14; else if (width == 24 && height == 24) radius = 34; else if (width == 26 && height == 26) radius = 27; else if (width == 8 && height == 15) radius = 17; else if (width == 10 && height == 16) radius = 19; else if (width == 11 && height == 15) radius = 19; else System.out.println("Wrong size: " + width + " " + width + " " + count); sprite.width = radius; sprite.height = radius; sprite.numOfFrame = (byte)count; sprite.pixels = new short[count][]; for (int j1 = 0; j1 < count; j1++) { sprite.pixels[j1] = new short[sprite.width * sprite.height]; int k1 = j1 * (360 / count); short l1 = width; short i2 = height; width = sprite.width; height = sprite.height; int j2 = width / 2; int k2 = l1 / 2; int l2 = i2 / 2; int i3 = SIN_TABLE[k1 % 360] << 8; int j3 = SIN_TABLE[(k1 + 90) % 360] << 8; int k4 = 0; int i4 = -j2 * j3; int j4 = -j2 * i3; for (int l4 = 0; l4 < sprite.pixels[j1].length; l4++) sprite.pixels[j1][l4] = (short) (TRANSPARENT << 12); for (int i5 = 0; i5 < height; i5++) { int k3 = -j2 * j3; int l3 = -j2 * i3; for (int j5 = 0; j5 < width; j5++) { //x int k5 = (k3 - j4 >> 16) + k2; //y int l5 = (i4 + l3 >> 16) + l2; if (k5 >= 0 && l5 >= 0 && l5 < i2 && k5 < l1) sprite.pixels[j1][k4] = project(pixels[0], l1, i2, (k3 - j4) + (k2 << 16), i4 + l3 + (l2 << 16)); k3 += j3; l3 += i3; k4++; } i4 += j3; j4 += i3; k4 -= width; k4 += sprite.width; } height = i2; width = l1; } return sprite; } /* * 绘制精灵 * 在这里实现了Nokia的特有API * 大家可以扩展该方法 * @param g * @param x * @param y * @param manipulate */ public void draw(Graphics g, int x, int y, int manipulate) { drawPixels(g, true, 0, width, x, y, width, height, manipulate, 4444); } public void drawPixels(Graphics g, boolean transparency, int offset, int scanlength, int x, int y, int width, int height, int manipulation, int format) { int l1 = map2Manipulation(manipulation); int j1; int k1; if ((l1 & 4) != 0) { j1 = height; k1 = width; } else { j1 = width; k1 = height; } short newPixels[] = new short [j1 * k1]; if(manipulation == 0){ newPixels = pixels[curFrame]; } else for (int i2 = 0; i2 < k1; i2++) { for (int j2 = 0; j2 < j1; j2++) { int j = j2; int k = i2; if ((l1 & 1) != 0) j = j1 - 1 - j; if ((l1 & 2) != 0) k = k1 - 1 - k; if ((l1 & 4) != 0) { int k2 = j; j = k; k = k2; } newPixels[j1 * i2 + j2] = pixels[curFrame][width * k + j]; } } int off = offset; int vw = x + j1; int vh = y + k1; for(int idy = y; idy < vh; idy++){ int voff = off; for(int idx = x; idx < vw; idx++){ short pixel = newPixels[voff++]; int k3 = idx; for(; idx < vw - 1 && newPixels[voff] == pixel; voff++) idx++; if((pixel >> 12 & 0xff) != 0) { int l3 = 0xf0 & pixel << 4; l3 |= 0xf000 & pixel << 8; l3 |= 0xf00000 & pixel << 12; g.setColor(l3); g.drawLine(k3, idy, idx, idy); } } off += j1; } } private static int map2Manipulation(int i) throws IllegalArgumentException { int j = 0; if ((i & 0x2000) != 0) j ^= 1; if ((i & 0x4000) != 0) j ^= 2; switch (i & 0xffff9fff) { case 90: // 'Z' j ^= 6; break; case 180: j ^= 3; break; case 270: j ^= 5; break; default: throw new IllegalArgumentException(); case 0: // '\0' break; } return j; } }
