0
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1 /**
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2 * Copyright (c) 2009, Benjamin Joffe
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3 * All rights reserved.
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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6 *
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7 * * Redistributions of source code must retain the above copyright
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8 * notice, this list of conditions and the following disclaimer.
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9 * * Redistributions in binary form must reproduce the above copyright
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10 * notice, this list of conditions and the following disclaimer in the
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11 * documentation and/or other materials provided with the distribution.
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12 *
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13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY
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14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR AND CONTRIBUTORS BE LIABLE FOR ANY
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17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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20 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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23 */
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24
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25 var map;
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26 var canvas;
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27 var overlay;
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28 //variables initiated at the bottom of the code...
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29
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30 var pi=Math.PI;
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31
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32 var total=0;
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33
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34 Number.prototype.range=function(){
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35 return (this+2*pi)%(2*pi);
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36 }
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37 Number.prototype.roundC=function(){
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38 return Math.round(this*100)/100;
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39 }
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40
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41 var total=0;
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42
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43 var samples=200;
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44
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45
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46 var arena=[];
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47 arena[0]=[1,1,1,1,1,1,1,1,1,1]
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48 arena[1]=[1,0,0,0,0,0,0,0,0,1]
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49 arena[2]=[1,0,0,1,0,1,1,1,0,1]
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50 arena[3]=[1,0,1,0,0,0,0,1,0,1]
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51 arena[4]=[1,0,0,0,0,1,0,1,0,1]
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52 arena[5]=[1,0,1,1,0,0,0,0,0,1]
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53 arena[6]=[1,0,0,1,0,1,1,1,0,1]
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54 arena[7]=[1,1,0,1,0,0,0,1,0,1]
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55 arena[8]=[1,0,0,1,0,1,0,0,0,1]
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56 arena[9]=[1,1,1,1,1,1,1,1,1,1]
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57
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58
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59 var playerPos=[4,4]; // x,y (from top left)
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60 var playerDir=0.4; // theta, facing right=0=2pi
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61 var playerPosZ=1;
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62 var key=[0,0,0,0,0]; // left, right, up, down
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63
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64 var playerVelY=0;
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65
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66
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67 var face=[];
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68
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69 function wallDistance(theta){
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70
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71 var data=[];
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72 face=[];
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73
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74 var x = playerPos[0], y = playerPos[1];
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75 var deltaX, deltaY;
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76 var distX, distY;
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77 var stepX, stepY;
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78 var mapX, mapY
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79
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80 var atX=Math.floor(x), atY=Math.floor(y);
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81
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82 var thisRow=-1;
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83 var thisSide=-1;
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84
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85 var lastHeight=0;
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86
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87 for (var i=0; i<samples; i++) {
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88 theta+=pi/(3*samples)+2*pi;
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89 theta%=2*pi;
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90
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91 mapX = atX, mapY = atY;
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92
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93 deltaX=1/Math.cos(theta);
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94 deltaY=1/Math.sin(theta);
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95
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96 if (deltaX>0) {
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97 stepX = 1;
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98 distX = (mapX + 1 - x) * deltaX;
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99 }
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100 else {
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101 stepX = -1;
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102 distX = (x - mapX) * (deltaX*=-1);
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103 }
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104 if (deltaY>0) {
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105 stepY = 1;
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106 distY = (mapY + 1 - y) * deltaY;
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107 }
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108 else {
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109 stepY = -1;
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110 distY = (y - mapY) * (deltaY*=-1);
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111 }
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112
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113
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114 for (var j=0; j<20; j++) {
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115 if (distX < distY) {
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116 mapX += stepX;
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117 if (arena[mapX][mapY]) {
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118 if (thisRow!=mapX || thisSide!=0) {
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119 if (i>0) {
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120 data.push(i);
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121 data.push(lastHeight);
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122 }
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123 data.push(i);
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124 data.push(distX);
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125 thisSide=0;
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126 thisRow=mapX;
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127 face.push(1+stepX);
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128 }
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129 lastHeight=distX;
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130 break;
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131 }
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132 distX += deltaX;
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133 }
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134 else {
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135 mapY += stepY;
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136 if (arena[mapX][mapY]) {
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137 if (thisRow!=mapY || thisSide!=1) {
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138 if (i>0) {
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139 data.push(i);
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140 data.push(lastHeight);
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141 }
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142 data.push(i);
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143 data.push(distY);
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144 thisSide=1;
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145 thisRow=mapY;
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146 face.push(2+stepY)
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147 }
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148 lastHeight=distY;
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149 break;
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150 }
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151 distY += deltaY;
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152 }
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153 }
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154 }
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155 data.push(i);
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156 data.push(lastHeight);
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157
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158 return data;
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159 }
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160
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161
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162 function drawCanvas(){
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163
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164 canvas.clearRect(0,0,400, 300);
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165
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166 var theta = playerDir-pi/6;
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167
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168 var wall=wallDistance(theta);
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169
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170 map.beginPath();
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171 map.clearRect(0,0,80,80);
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172 map.fillStyle="#3366CC";
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173 map.arc(playerPos[0]*8, playerPos[1]*8, 3, 0, 2*pi, true);
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174 map.fill();
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175 map.beginPath();
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176 map.moveTo(8*playerPos[0], 8*playerPos[1]);
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177
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178
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179 var linGrad;
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180
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181 var tl,tr,bl,br;
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182
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183 var theta1,theta2,fix1,fix2;
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184
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185 for (var i=0; i<wall.length; i+=4) {
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186
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187 theta1=playerDir-pi/6 + pi*wall[i]/(3*samples);
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188 theta2=playerDir-pi/6 + pi*wall[i+2]/(3*samples);
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189
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190 fix1 = Math.cos(theta1-playerDir);
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191 fix2 = Math.cos(theta2-playerDir);
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192
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193 var h=2-playerPosZ;
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194
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195 var wallH1=100/(wall[i+1]*fix1);
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196 var wallH2=100/(wall[i+3]*fix2);
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197
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198 tl=[wall[i]*2, 150-wallH1*h];
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199 tr=[wall[i+2]*2, 150-wallH2*h]
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200 br=[wall[i+2]*2, tr[1]+wallH2*2];
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201 bl=[wall[i]*2, tl[1]+wallH1*2]
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202
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203 var shade1=Math.floor(wallH1*2+20); if (shade1>255) shade1=255;
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204 var shade2=Math.floor(wallH2*2+20); if (shade2>255) shade2=255;
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205
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206 linGrad = canvas.createLinearGradient(tl[0],0,tr[0],0);
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207 linGrad.addColorStop(0, 'rgba('+(face[i/4]%2==0 ? shade1 : 0)+','+(face[i/4]==1 ? shade1 : 0)+','+(face[i/4]==2 ? 0 : shade1)+',1.0)');
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208 linGrad.addColorStop(1, 'rgba('+(face[i/4]%2==0 ? shade2 : 0)+','+(face[i/4]==1 ? shade2 : 0)+','+(face[i/4]==2 ? 0 : shade2)+',1.0)');
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209
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210 canvas.beginPath();
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211 canvas.moveTo(tl[0], tl[1]);//¶ã
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212 // canvas.moveTo(tr[0], tr[1]);
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213 canvas.lineTo(tr[0], tr[1]);//‰Eã
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214 canvas.lineTo(br[0], br[1]);//‰E‰º
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215 canvas.lineTo(bl[0], bl[1]);//¶‰º
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216 // canvas.lineTo(0,0);
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217 canvas.fillStyle = linGrad;
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218 canvas.fill();
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219
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220
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221 map.lineTo(playerPos[0]*8+Math.cos(theta1)*(wall[i+1])*8, playerPos[1]*8+Math.sin(theta1)*(wall[i+1])*8);
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222 map.lineTo(playerPos[0]*8+Math.cos(theta2)*(wall[i+3])*8, playerPos[1]*8+Math.sin(theta2)*(wall[i+3])*8);
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223
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224
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225 }
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226 map.fillStyle="#FF0000"
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227 map.fill();
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228
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229 }
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230
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231 function nearWall(x,y){
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232 var xx,yy;
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233 if (isNaN(x)) x=playerPos[0];
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234 if (isNaN(y)) y=playerPos[1];
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235 for (var i=-0.1; i<=0.1; i+=0.2) {
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236 xx=Math.floor(x+i)
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237 for (var j=-0.1; j<=0.1; j+=0.2) {
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238 yy=Math.floor(y+j);
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239 if (arena[xx][yy]) return true;
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240 }
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241 }
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242 return false;
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243 }
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244
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245 var xOff = 0;
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246 var yOff = 0;
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247 function wobbleGun(){
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248 var mag=playerVelY;
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249 xOff = (10+Math.cos(total/6.23)*mag*90)
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250 yOff = (10+Math.cos(total/5)*mag*90)
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251 overlay.style.backgroundPosition = xOff + "px " + yOff + "px";
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252 }
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253
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254
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255 var jumpCycle=0;
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256
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257 var audio = window.Audio && new Audio("shoot.wav");
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258
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259 function shoot()
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260 {
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261 audio && audio.play();
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262 canvas.save();
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263 canvas.strokeStyle = "#FFFF00";
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264 canvas.beginPath();
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265
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266 canvas.moveTo(190+xOff, 140+yOff);
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267 canvas.lineTo(250+xOff, 200+yOff);
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268 canvas.closePath();
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269 canvas.stroke();
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270 canvas.restore();
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271 setTimeout('drawCanvas()',100);
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272 }
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273
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274
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275 function update(){
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276
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277 total++;
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278
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279 var change=false;
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280
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281 if (jumpCycle) {
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282 jumpCycle--;
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283 change=true;
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284 playerPosZ = 1 + jumpCycle*(20-jumpCycle)/30;
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285 }
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286 else if (key[4]) jumpCycle=20;
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287
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288 if (key[0]) {
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289 if (!key[1]) {
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290 playerDir-=0.07; //left
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291 change=true;
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292 }
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293 }
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294 else if (key[1]) {
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295 playerDir+=0.07; //right
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296 change=true;
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297 }
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298
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299 if (change) {
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300 playerDir+=2*pi;
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301 playerDir%=2*pi;
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302 document.getElementById("sky").style.backgroundPosition=Math.floor(1-playerDir/(2*pi)*2400)+"px 0";
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303 }
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304
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305 if (key[2] && !key[3]) {
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306 if (playerVelY<0.1) playerVelY += 0.02;
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307 }
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308 else if (key[3] && !key[2]) {
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309 if (playerVelY>-0.1) playerVelY -= 0.02;
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310 }
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311 else {
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312 if (playerVelY<-0.02) playerVelY += 0.015;
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313 else if (playerVelY>0.02) playerVelY -= 0.015;
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314 else playerVelY=0;
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315 }
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316
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317
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318 if (playerVelY!=0) {
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319
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320 var oldX=playerPos[0];;
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321 var oldY=playerPos[1];
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322 var newX=oldX+Math.cos(playerDir)*playerVelY;
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323 var newY=oldY+Math.sin(playerDir)*playerVelY;
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324
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325 if (!nearWall(newX, oldY)) {
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326 playerPos[0]=newX;
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327 oldX=newX;
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328 change=true;
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329 }
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330 if (!nearWall(oldX, newY)) {
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331 playerPos[1]=newY;
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332 change=true;
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333 }
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334
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335 }
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336
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337 if (playerVelY) wobbleGun();
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338 if (change) drawCanvas();
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339
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340 }
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341
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342
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343 function changeKey(which, to){
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344 switch (which){
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345 case 65:case 37: key[0]=to; break; // left
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346 case 87: case 38: key[2]=to; break; // up
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347 case 68: case 39: key[1]=to; break; // right
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348 case 83: case 40: key[3]=to; break;// down
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349 case 32: key[4]=to; break; // space bar;
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350 case 17: key[5]=to; break; // ctrl
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351 case 66: if (to) { shoot() } break; // b
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352 }
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353 }
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354 document.onkeydown=function(e){changeKey((e||window.event).keyCode, 1);}
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355 document.onkeyup=function(e){changeKey((e||window.event).keyCode, 0);}
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356
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357
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358 function initUnderMap(){
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359 var underMap=document.getElementById("underMap").getContext("2d");
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360 underMap.fillStyle="#FFF";
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361 underMap.fillRect(0,0, 200, 200);
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362 underMap.fillStyle="#444";
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363 for (var i=0; i<arena.length; i++) {
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364 for (var j=0; j<arena[i].length; j++) {
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365 if (arena[i][j]) underMap.fillRect(i*8, j*8, 8, 8);
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366 }
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367 }
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368 }
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369
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370
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371 window.onload=function(){
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372 var ele = document.getElementById("map");
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373 if (!ele.getContext)
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374 {
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375 alert('An error occured creating a Canvas 2D context. This may be because you are using an old browser, if not please contact me and I\'ll see if I can fix the error.');
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376 return;
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377 }
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378 map=ele.getContext("2d");
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379 canvas=document.getElementById("canvas").getContext("2d");
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380 overlay=document.getElementById("overlay");
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381 document.getElementById("sky").style.backgroundPosition=Math.floor(-playerDir/(2*pi)*2400)+"px 0";
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382 drawCanvas();
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383 initUnderMap();
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384 setInterval(update, 35);
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385 } |