cairo-rendering.c

   1 /*******************************************************************************
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   3 **      10        20        30        40        50        60        70        80
   4 **
   5 ** file:
   6 **    cairo-rendering.c
   7 **
   8 ** author:
   9 **    Mirco "MacSlow" Mueller <macslow@bangang.de>
  10 **
  11 ** copyright (C) Mirco Mueller, July 2006, placed under the terms of the GPL
  12 **
  13 *******************************************************************************/
  14
  15 #include "geometry.h"
  16 #include "cairo-rendering.h"
  17 #include "globals.h"
  18
  19 #include <math.h>
  20
  21 void
  22 draw_point (cairo_t* pCairoContext,
  23                         gdouble fX,
  24                         gdouble fY)
  25 {
  26         cairo_set_line_width (pCairoContext, 0.015f);
  27         cairo_arc (pCairoContext, fX, fY, 0.025f, 0.0f, M_PI / 180.0f * 360.0f);
  28         cairo_set_source_rgba (pCairoContext, 0.5f, 1.0f, 0.5f, 0.5f);
  29         cairo_fill_preserve (pCairoContext);
  30         cairo_set_source_rgba (pCairoContext, 1.0f, 0.0f, 0.0f, 1.0f);
  31         cairo_stroke (pCairoContext);
  32 }
  33
  34 void
  35 render_curve (cairo_t* pCairoContext,
  36                           gint iWidth,
  37                           gint iHeight,
  38                           Line* pLineOne,
  39                           Line* pLineTwo)
  40 {
  41         if (pLineOne == NULL || pLineTwo == NULL)
  42                 return;
  43
  44         cairo_save (pCairoContext);
  45         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_SOURCE);
  46         cairo_scale (pCairoContext, (gdouble) iWidth / 1.0f, (gdouble) iHeight / 1.0f);
  47         cairo_set_source_rgba (pCairoContext, 0.0f, 0.0f, 0.0f, 0.0f);
  48         cairo_paint (pCairoContext);
  49         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_OVER);
  50
  51         cairo_set_source_rgba (pCairoContext, 0.0f, 0.0f, 0.0f, 1.0f);
  52         cairo_set_line_cap (pCairoContext, CAIRO_LINE_CAP_ROUND);
  53         cairo_set_line_width (pCairoContext, 0.05f);
  54         cairo_move_to (pCairoContext, pLineOne->start.fX, pLineOne->start.fY);
  55         cairo_curve_to (pCairoContext,
  56                                         pLineOne->end.fX,
  57                                         pLineOne->end.fY,
  58                                         pLineTwo->start.fX,
  59                                         pLineTwo->start.fY,
  60                                         pLineTwo->end.fX,
  61                                         pLineTwo->end.fY);
  62         cairo_stroke (pCairoContext);
  63         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_OVER);
  64         cairo_set_line_width (pCairoContext, 0.01f);
  65         cairo_set_source_rgba (pCairoContext, 0.25f, 0.5f, 1.0f, 1.0f);
  66         cairo_move_to (pCairoContext, pLineOne->start.fX, pLineOne->start.fY);
  67         cairo_line_to (pCairoContext, pLineOne->end.fX, pLineOne->end.fY);
  68         cairo_stroke (pCairoContext);
  69         cairo_move_to (pCairoContext, pLineTwo->start.fX, pLineTwo->start.fY);
  70         cairo_line_to (pCairoContext, pLineTwo->end.fX, pLineTwo->end.fY);
  71         cairo_stroke (pCairoContext);
  72         draw_point (pCairoContext, pLineOne->start.fX, pLineOne->start.fY);
  73         draw_point (pCairoContext, pLineOne->end.fX, pLineOne->end.fY);
  74         draw_point (pCairoContext, pLineTwo->start.fX, pLineTwo->start.fY);
  75         draw_point (pCairoContext, pLineTwo->end.fX, pLineTwo->end.fY);
  76         cairo_restore (pCairoContext);
  77 }
  78
  79 void
  80 render_zini (cairo_t* pCairoContext,
  81                          gint iWidth,
  82                          gint iHeight)
  83 {
  84         gdouble fLength = 1.0f / 25.0f;
  85         gdouble fY;
  86         gint i;
  87
  88         cairo_save (pCairoContext);
  89         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_SOURCE);
  90         cairo_set_line_cap (pCairoContext, CAIRO_LINE_CAP_ROUND);
  91         cairo_set_source_rgba (pCairoContext, 0.0f, 0.0f, 0.0f, 0.0f);
  92         cairo_scale (pCairoContext, (gdouble) iWidth / 1.0f, (gdouble) iHeight / 1.0f);
  93         cairo_paint (pCairoContext);
  94         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_OVER);
  95         cairo_set_line_width (pCairoContext, fLength);
  96         for (i = 0; i < 60; i++)
  97         {
  98                 cairo_save (pCairoContext);
  99                 cairo_translate (pCairoContext, 0.5f, 0.5f);
 100                 cairo_rotate (pCairoContext, M_PI / 180.0f * (g_ulMilliSeconds + 10.0f * i) * 0.36f);
 101                 fY = 0.33f + 0.0825f * sinf ((g_ulMilliSeconds + 10.0f*i)/1000 * 10 * M_PI);
 102                 cairo_translate (pCairoContext, 0.0f, fY);
 103                 cairo_rotate (pCairoContext, M_PI / 180.0f * 6.0f * i);
 104                 cairo_set_source_rgba (pCairoContext, 1.0f, 0.5f, 0.0f, i * 0.01f);
 105                 cairo_move_to (pCairoContext, -fLength, 0.0f);
 106                 cairo_line_to (pCairoContext, fLength, 0.0f);
 107                 cairo_stroke (pCairoContext);
 108                 cairo_restore (pCairoContext);
 109         }
 110         cairo_restore (pCairoContext);
 111 }
 112
 113 void
 114 render_flower (cairo_t* pCairoContext,
 115                            gint iWidth,
 116                            gint iHeight)
 117 {
 118         cairo_save (pCairoContext);
 119         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_SOURCE);
 120         cairo_set_source_rgba (pCairoContext, 0.0f, 0.0f, 0.0f, 0.0f);
 121         cairo_scale (pCairoContext, (gdouble) iWidth / 1.0f, (gdouble) iHeight / 1.0f);
 122         cairo_paint (pCairoContext);
 123         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_OVER);
 124
 125         cairo_translate (pCairoContext, 0.5f, 0.5f);
 126         cairo_rotate (pCairoContext, -M_PI / 180.0f * g_ulMilliSeconds * 0.36f);
 127
 128         cairo_save (pCairoContext);
 129
 130         cairo_translate (pCairoContext, -0.5f, -0.5f);
 131         cairo_move_to (pCairoContext, 0.5f, 0.4f);
 132         cairo_curve_to (pCairoContext, 0.5f, 0.2f, 0.6f, 0.1f, 0.7f, 0.1f);
 133         cairo_curve_to (pCairoContext, 0.8f, 0.1f, 0.9f, 0.2f, 0.9f, 0.3f);
 134         cairo_curve_to (pCairoContext, 0.9f, 0.4f, 0.8f, 0.5f, 0.6f, 0.5f);
 135         cairo_curve_to (pCairoContext, 0.8f, 0.5f, 0.9f, 0.6f, 0.9f, 0.7f);
 136         cairo_curve_to (pCairoContext, 0.9f, 0.8f, 0.8f, 0.9f, 0.7f, 0.9f);
 137         cairo_curve_to (pCairoContext, 0.6f, 0.9f, 0.5f, 0.8f, 0.5f, 0.6f);
 138         cairo_curve_to (pCairoContext, 0.5f, 0.8f, 0.4f, 0.9f, 0.3f, 0.9f);
 139         cairo_curve_to (pCairoContext, 0.2f, 0.9f, 0.1f, 0.8f, 0.1f, 0.7f);
 140         cairo_curve_to (pCairoContext, 0.1f, 0.6f, 0.2f, 0.5f, 0.3f, 0.5f);
 141         cairo_curve_to (pCairoContext, 0.2f, 0.5f, 0.1f, 0.4f, 0.1f, 0.3f);
 142         cairo_curve_to (pCairoContext, 0.1f, 0.2f, 0.2f, 0.1f, 0.3f, 0.1f);
 143         cairo_curve_to (pCairoContext, 0.4f, 0.1f, 0.5f, 0.2f, 0.5f, 0.3f);
 144
 145         cairo_restore (pCairoContext);
 146
 147         cairo_set_source_rgba (pCairoContext, 1.0f, 0.0f, 0.0f, 0.75f);
 148         cairo_fill (pCairoContext);
 149         cairo_restore (pCairoContext);
 150 }