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annotate nodejs/animate.js @ 804:55875133fa60

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Compare performance of setInterval() and setTimeout()
author Thinker K.F. Li <thinker@codemud.net>
date Wed, 01 Sep 2010 16:23:43 +0800
parents 210e4d24a3ba
children ae2faf140dc2
rev   line source
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1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
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2 // vim: sw=4:ts=8:sts=4:ai
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3 var sys=require("sys");
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4
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5 /*
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6 * This is configuration for animate module. For slower or speeder
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7 * machines, ffs can be decreased or increased respective.
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8 */
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9 var ffs = 20;
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10 var frame_interval = 1000 / ffs;
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11 var tm_flag = 1;
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12
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13 function linear_draw() {
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14 var percent;
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15
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16 this.percent = this.percent + this.step;
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17 percent = this.percent;
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18 if (percent > 1) percent = 1;
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19
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20 this.c++;
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21 if(percent >= 1) {
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22 this.obj.timer.stop();
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23 delete this.obj.timer;
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24 sys.puts(Date.now() - this._start_tm);
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25 }
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26
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27 this.obj[2] = (this.targetx-this.startposx)*percent+this.startposx;
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28 this.obj[5] = (this.targety-this.startposy)*percent+this.startposy;
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29 this.app.refresh();
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30 if(tm_flag) {
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31 var self = this;
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32 if(percent < 1)
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33 this.obj.timer = setTimeout(function() { self.draw(); }, frame_interval);
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34 }
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35 }
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36
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37 function linear_draw_start() {
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38 var obj = this.obj;
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39 var self = this;
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40
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41 if(obj.timer)
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42 obj.timer.stop();
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43
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44 this.startposx = obj[2];
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45 this.startposy = obj[5];
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46 this.c = 0;
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47 this.step = 1000 / (this.duration * ffs);
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48 this.percent = 0;
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49 this._start_tm = Date.now();
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50 if(tm_flag == 1)
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51 obj.timer = setTimeout(function() { self.draw(); }, frame_interval);
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52 else
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53 obj.timer = setInterval(function() { self.draw(); }, frame_interval);
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54 }
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55
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56 function linear(app,obj,shiftx,shifty,duration) {
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57 obj.animated_linear = this;
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58 this.app = app;
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59 this.obj = obj;
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60 this.end = 0;
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61 this.targetx = shiftx + obj[2];
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62 this.targety = shifty + obj[5];
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63 this.duration = duration*1000;
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64 }
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65
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66 exports.linear = linear;
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67 linear.prototype.start = linear_draw_start;
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68 linear.prototype.draw = linear_draw;
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69
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70 /* ------------------------------------------------------------ */
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71 function rotate(app, obj, ang, duration) {
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72 this._app = app;
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73 this._obj = obj;
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74 this._ang = ang;
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75 this._duration = duration;
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76 }
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77
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78 function rotate_start() {
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79 var obj = this._obj;
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80 var self = this;
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81
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82 this._step = 1 / (ffs * this._duration);
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83 this._percent = 0;
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84 this._start_mtx = [obj[0], obj[1], obj[2], obj[3], obj[4], obj[5]];
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85 obj.timer = setInterval(function() { self.draw(); }, frame_interval);
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86 }
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87
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88 function rotate_draw() {
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89 var percent;
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90 var ang;
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91 var sv, cv;
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92 var obj = this._obj;
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93 var mtx, shift;
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94
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95 this._percent = percent = this._percent + this._step;
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96 if(percent > 1) {
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97 percent = 1;
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98 obj.timer.stop();
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99 }
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100
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101 ang = percent * this._ang;
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102 sv = Math.sin(ang);
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103 cv = Math.cos(ang);
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104 mtx = [cv, -sv, 0, sv, cv, 0];
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105
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106 shift = [1, 0, -obj.center_x, 0, 1, -obj.center_y];
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107 mtx = multiply(mtx, shift);
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108 shift = [1, 0, obj.center_x, 0, 1, obj.center_y];
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109 mtx = multiply(shift, mtx);
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110 mtx = multiply(mtx, this._start_mtx);
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111
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112 obj[0] = mtx[0];
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113 obj[1] = mtx[1];
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114 obj[2] = mtx[2];
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115 obj[3] = mtx[3];
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116 obj[4] = mtx[4];
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117 obj[5] = mtx[5];
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118
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119 this._app.refresh();
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120 }
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121
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122 rotate.prototype.start = rotate_start;
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123 rotate.prototype.draw = rotate_draw;
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124 exports.rotate = rotate;
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125
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126 function multiply(s,d) {
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127 var m=[];
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128 m[0] = s[0]*d[0]+s[1]*d[3];
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129 m[1] = s[0]*d[1]+s[1]*d[4];
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130 m[2] = s[0]*d[2]+s[1]*d[5]+s[2];
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131 m[3] = s[3]*d[0]+s[4]*d[3];
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132 m[4] = s[3]*d[1]+s[4]*d[4];
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133 m[5] = s[3]*d[2]+s[4]*d[5]+s[5];
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134 return m;
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135 }
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136
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137
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138 function scale_draw() {
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139 if (this.end == 1) return;
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140 var percent = (Date.now() - this.starttime)/this.duration;
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141 if (percent > 1) percent = 1;
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142 var sx = (this.targetx-this.startsx)*percent+this.startsx;
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143 var sy = (this.targety-this.startsy)*percent+this.startsy;
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144 var t=[sx,0,0,0,sy,0];
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145 this.obj[0] = sx;
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146 this.obj[4] = sy;
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147 this.obj[2] = this.origin_offset_x - (sx-this.startsx)*this.obj.center.x;
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148 this.obj[5] = this.origin_offset_y - (sy-this.startsy)*this.obj.center.y;
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149
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150 this.app.refresh();
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151 var self = this;
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152 if (percent < 1) {
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153 this.obj.timer=setTimeout(function() { self.draw();}, 20);
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154 return;
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155 }
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156 this.app.refresh();
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157 this.obj.animated_scale = null;
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158 }
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159
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160 function scale(app,obj,targetx,targety, duration) {
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161 try {
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162 if (obj.animated_scale) {
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163 //obj[0] = obj.animated_scale.targetx;
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164 //obj[4] = obj.animated_scale.targety;
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165 //obj[2] = obj.animated_scale.final_offset_x;
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166 //obj[5] = obj.aninated_scale.final_offset_y;
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167 obj.animated_scale.end = 1;
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168 }
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169 } catch(e) {
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170
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171 }
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172 obj.animated_scale = this;
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173 this.app = app;
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174 this.obj = obj;
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175 this.end = 0;
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176 this.starttime = Date.now();
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177 this.startsx = obj[0];
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178 this.startsy = obj[4];
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179 this.targetx = targetx;
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180 this.targety = targety;
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181 this.duration = duration*1000;
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182 this.origin_offset_x = obj[2];
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183 this.origin_offset_y = obj[5];
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184 this.final_offset_x = this.origin_offset_x-(targetx-this.startsx)*obj.center.x;
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185 this.final_offset_y = this.origin_offset_y-(targety-this.startsy)*obj.center.y;
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186 }
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187
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188
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189 exports.scale = scale;
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190 scale.prototype.start = scale_draw;
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191 scale.prototype.draw = scale_draw;
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192
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193 function holder(app, coord) {
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194 var mtx = [coord[0], coord[1], coord[2], coord[3], coord[4], coord[5]];
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195
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196 this._mtx = mtx;
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197 this._coord = coord;
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198 this._app = app;
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199 }
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200
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201 holder.prototype = {
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202 go_center: function(o) {
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203 var sx, sy;
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204
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205 sx = o.center_x - this._coord.center_x;
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206 sy = o.center_y - this._coord.center_y;
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207 this.shift(sx, sy);
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208 },
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209
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210 home: function() {
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211 this._coord[2] = this._mtx[2];
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212 this._coord[5] = this._mtx[5];
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213 this._app.refresh();
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214 },
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215
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216 shift: function(sx, sy) {
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217 this._coord[2] = this._mtx[2] + sx;
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218 this._coord[5] = this._mtx[5] + sy;
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219 this._app.refresh();
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220 }
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221 };
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222
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223 exports.holder = holder;