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annotate molko-js/src/js-painter.c @ 190:5dc57029b9f1

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molko-js: allow objects/parameters in Molko.Painter API
author David Demelier <markand@malikania.fr>
date Sat, 07 Nov 2020 10:16:38 +0100
parents a5436e15898d
children 633a25df450e
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189
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1 /*
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2 * js-painter.c -- basic drawing routines (Javascript bindings)
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20
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21 #include <duktape.h>
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22
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23 #include <core/painter.h>
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24
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25 #include "js.h"
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26 #include "js-painter.h"
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27
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28 static duk_ret_t
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29 js_painter_getColor(duk_context *ctx)
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30 {
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31 duk_push_number(ctx, painter_get_color());
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32
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33 return 1;
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34 }
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35
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36 static duk_ret_t
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37 js_painter_setColor(duk_context *ctx)
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38 {
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39 painter_set_color(duk_require_number(ctx, 0));
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40
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41 return 0;
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42 }
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43
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44 static duk_ret_t
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45 js_painter_new(duk_context *ctx)
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46 {
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47 if (!duk_is_constructor_call(ctx))
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48 duk_error(ctx, DUK_ERR_TYPE_ERROR, "Painter must be new-constructed");
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49
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50 duk_push_this(ctx);
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51 duk_push_string(ctx, "color");
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52 duk_push_c_function(ctx, js_painter_getColor, 0);
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53 duk_push_c_function(ctx, js_painter_setColor, 1);
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54 duk_def_prop(ctx, -4, DUK_DEFPROP_HAVE_GETTER | DUK_DEFPROP_HAVE_SETTER);
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55
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56 return 0;
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57 }
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58
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59 static duk_ret_t
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60 js_painter_clear(duk_context *ctx)
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61 {
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62 (void)ctx;
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63
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64 painter_clear();
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65
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66 return 0;
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67 }
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68
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69 static duk_ret_t
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70 js_painter_drawLine(duk_context *ctx)
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71 {
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72 int x1, y1, x2, y2;
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73
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74 if (duk_get_top(ctx) == 4) {
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75 x1 = duk_require_int(ctx, 0);
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76 y1 = duk_require_int(ctx, 1);
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77 x2 = duk_require_int(ctx, 2);
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78 y2 = duk_require_int(ctx, 3);
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79 } else if (duk_get_top(ctx) == 1) {
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80 duk_require_object(ctx, 0);
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81 duk_get_prop_string(ctx, 0, "x1");
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82 x1 = duk_require_int(ctx, -1);
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83 duk_get_prop_string(ctx, 0, "y1");
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84 y1 = duk_require_int(ctx, -1);
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85 duk_get_prop_string(ctx, 0, "x2");
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86 x2 = duk_require_int(ctx, -1);
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87 duk_get_prop_string(ctx, 0, "y2");
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88 y2 = duk_require_int(ctx, -1);
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89 duk_pop_n(ctx, 4);
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90 } else
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91 return duk_error(ctx, DUK_ERR_ERROR, "Object or 4 numbers expected");
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92
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93 painter_draw_line(x1, y2, x2, y2);
189
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94
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95 return 0;
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96 }
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97
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98 static duk_ret_t
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99 js_painter_drawPoint(duk_context *ctx)
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100 {
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101 int x, y;
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102
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103 if (duk_get_top(ctx) == 2) {
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104 x = duk_require_int(ctx, 0);
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105 y = duk_require_int(ctx, 1);
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106 } else if (duk_get_top(ctx) == 1) {
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107 duk_require_object(ctx, 0);
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108 duk_get_prop_string(ctx, 0, "x");
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109 x = duk_require_int(ctx, -1);
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110 duk_get_prop_string(ctx, 0, "y");
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111 y = duk_require_int(ctx, -1);
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112 duk_pop_n(ctx, 2);
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113 } else
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114 return duk_error(ctx, DUK_ERR_ERROR, "Object or 2 numbers expected");
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115
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116 painter_draw_point(x, y);
189
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117
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118 return 0;
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119 }
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120
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121 static duk_ret_t
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122 js_painter_drawRectangle(duk_context *ctx)
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123 {
190
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124 int x, y;
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125 unsigned int w, h;
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126
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127 if (duk_get_top(ctx) == 4) {
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128 x = duk_require_int(ctx, 0);
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129 y = duk_require_int(ctx, 1);
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130 w = duk_require_uint(ctx, 2);
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131 h = duk_require_uint(ctx, 3);
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132 } else if (duk_get_top(ctx) == 1) {
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133 duk_require_object(ctx, 0);
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134 duk_get_prop_string(ctx, 0, "x");
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135 x = duk_require_int(ctx, -1);
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136 duk_get_prop_string(ctx, 0, "y");
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137 y = duk_require_int(ctx, -1);
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138 duk_get_prop_string(ctx, 0, "w");
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139 w = duk_require_uint(ctx, -1);
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140 duk_get_prop_string(ctx, 0, "h");
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141 h = duk_require_uint(ctx, -1);
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142 duk_pop_n(ctx, 4);
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143 } else
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144 return duk_error(ctx, DUK_ERR_ERROR, "Object or 4 numbers expected");
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145
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146 painter_draw_rectangle(x, y, w, h);
189
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147
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148 return 0;
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149 }
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150
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151 static duk_ret_t
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152 js_painter_drawCircle(duk_context *ctx)
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153 {
190
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154 int x, y;
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155 double r;
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156
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157 if (duk_get_top(ctx) == 3) {
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158 x = duk_require_int(ctx, 0);
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159 y = duk_require_int(ctx, 1);
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160 r = duk_require_number(ctx, 2);
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161 } else if (duk_get_top(ctx) == 1) {
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162 duk_require_object(ctx, 0);
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163 duk_get_prop_string(ctx, 0, "x");
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164 x = duk_require_int(ctx, -1);
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165 duk_get_prop_string(ctx, 0, "y");
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166 y = duk_require_int(ctx, -1);
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167 duk_get_prop_string(ctx, 0, "r");
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168 r = duk_require_number(ctx, -1);
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169 duk_pop_n(ctx, 3);
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170 } else
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171 return duk_error(ctx, DUK_ERR_ERROR, "Object or 3 numbers expected");
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172
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173 painter_draw_circle(x, y, r);
189
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174
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175 return 0;
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176 }
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177
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178 static duk_ret_t
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179 js_painter_present(duk_context *ctx)
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180 {
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181 (void)ctx;
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182
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183 painter_present();
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184
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185 return 0;
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186 }
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187
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188 static const duk_function_list_entry methods[] = {
190
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189 { "clear", js_painter_clear, 0 },
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190 { "drawLine", js_painter_drawLine, DUK_VARARGS },
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191 { "drawPoint", js_painter_drawPoint, DUK_VARARGS },
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192 { "drawRectangle", js_painter_drawRectangle, DUK_VARARGS },
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193 { "drawCircle", js_painter_drawCircle, DUK_VARARGS },
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194 { "present", js_painter_present, 0 },
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195 { NULL, NULL, 0 }
189
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196 };
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197
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198 void
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199 js_painter_load(struct js *js)
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200 {
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201 assert(js);
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202
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203 duk_push_global_object(js->handle);
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204 duk_get_prop_string(js->handle, -1, "Molko");
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205 duk_push_c_function(js->handle, js_painter_new, 0);
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206 duk_push_object(js->handle);
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207 duk_put_function_list(js->handle, -1, methods);
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208 duk_put_prop_string(js->handle, -2, "prototype");
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209 duk_put_prop_string(js->handle, -2, "Painter");
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210 duk_pop_n(js->handle, 2);
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211 }