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, 2006/2007, 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, G_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,
  47                      (gdouble) iWidth / 1.0f,
  48                      (gdouble) iHeight / 1.0f);
  49         cairo_set_source_rgba (pCairoContext, 0.0f, 0.0f, 0.0f, 0.0f);
  50         cairo_paint (pCairoContext);
  51         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_OVER);
  52
  53         cairo_set_source_rgba (pCairoContext, 0.0f, 0.0f, 0.0f, 1.0f);
  54         cairo_set_line_cap (pCairoContext, CAIRO_LINE_CAP_ROUND);
  55         cairo_set_line_width (pCairoContext, 0.05f);
  56         cairo_move_to (pCairoContext, pLineOne->start.fX, pLineOne->start.fY);
  57         cairo_curve_to (pCairoContext,
  58                         pLineOne->end.fX,
  59                         pLineOne->end.fY,
  60                         pLineTwo->start.fX,
  61                         pLineTwo->start.fY,
  62                         pLineTwo->end.fX,
  63                         pLineTwo->end.fY);
  64         cairo_stroke (pCairoContext);
  65         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_OVER);
  66         cairo_set_line_width (pCairoContext, 0.01f);
  67         cairo_set_source_rgba (pCairoContext, 0.25f, 0.5f, 1.0f, 1.0f);
  68         cairo_move_to (pCairoContext, pLineOne->start.fX, pLineOne->start.fY);
  69         cairo_line_to (pCairoContext, pLineOne->end.fX, pLineOne->end.fY);
  70         cairo_stroke (pCairoContext);
  71         cairo_move_to (pCairoContext, pLineTwo->start.fX, pLineTwo->start.fY);
  72         cairo_line_to (pCairoContext, pLineTwo->end.fX, pLineTwo->end.fY);
  73         cairo_stroke (pCairoContext);
  74         draw_point (pCairoContext, pLineOne->start.fX, pLineOne->start.fY);
  75         draw_point (pCairoContext, pLineOne->end.fX, pLineOne->end.fY);
  76         draw_point (pCairoContext, pLineTwo->start.fX, pLineTwo->start.fY);
  77         draw_point (pCairoContext, pLineTwo->end.fX, pLineTwo->end.fY);
  78         cairo_restore (pCairoContext);
  79 }
  80
  81 void
  82 render_zini (cairo_t* pCairoContext,
  83              gint     iWidth,
  84              gint     iHeight)
  85 {
  86         gdouble fLength = 1.0f / 25.0f;
  87         gdouble fY;
  88         gint i;
  89
  90         cairo_save (pCairoContext);
  91         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_SOURCE);
  92         cairo_set_line_cap (pCairoContext, CAIRO_LINE_CAP_ROUND);
  93         cairo_set_source_rgba (pCairoContext, 0.0f, 0.0f, 0.0f, 0.0f);
  94         cairo_scale (pCairoContext,
  95                      (gdouble) iWidth / 1.0f,
  96                      (gdouble) iHeight / 1.0f);
  97         cairo_paint (pCairoContext);
  98         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_OVER);
  99         cairo_set_line_width (pCairoContext, fLength);
 100         for (i = 0; i < 60; i++)
 101         {
 102                 cairo_save (pCairoContext);
 103                 cairo_translate (pCairoContext, 0.5f, 0.5f);
 104                 cairo_rotate (pCairoContext,
 105                               G_PI / 180.0f *
 106                               (g_ulMilliSeconds + 10.0f * i) *
 107                               0.36f);
 108                 fY = 0.33f +
 109                      0.0825f *
 110                      sinf ((g_ulMilliSeconds + 10.0f * i) / 1000 * 10 * G_PI);
 111                 cairo_translate (pCairoContext, 0.0f, fY);
 112                 cairo_rotate (pCairoContext, G_PI / 180.0f * 6.0f * i);
 113                 cairo_set_source_rgba (pCairoContext,
 114                                        1.0f,
 115                                        0.5f,
 116                                        0.0f,
 117                                        i * 0.01f);
 118                 cairo_move_to (pCairoContext, -fLength, 0.0f);
 119                 cairo_line_to (pCairoContext, fLength, 0.0f);
 120                 cairo_stroke (pCairoContext);
 121                 cairo_restore (pCairoContext);
 122         }
 123         cairo_restore (pCairoContext);
 124 }
 125
 126 void
 127 render_flower (cairo_t* pCairoContext,
 128                gint     iWidth,
 129                gint     iHeight)
 130 {
 131         cairo_save (pCairoContext);
 132         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_SOURCE);
 133         cairo_set_source_rgba (pCairoContext, 0.0f, 0.0f, 0.0f, 0.0f);
 134         cairo_scale (pCairoContext,
 135                      (gdouble) iWidth / 1.0f,
 136                      (gdouble) iHeight / 1.0f);
 137         cairo_paint (pCairoContext);
 138         cairo_set_operator (pCairoContext, CAIRO_OPERATOR_OVER);
 139
 140         cairo_translate (pCairoContext, 0.5f, 0.5f);
 141         cairo_rotate (pCairoContext, -G_PI / 180.0f * g_ulMilliSeconds * 0.36f);
 142
 143         cairo_save (pCairoContext);
 144
 145         cairo_translate (pCairoContext, -0.5f, -0.5f);
 146         cairo_move_to (pCairoContext, 0.5f, 0.4f);
 147         cairo_curve_to (pCairoContext, 0.5f, 0.2f, 0.6f, 0.1f, 0.7f, 0.1f);
 148         cairo_curve_to (pCairoContext, 0.8f, 0.1f, 0.9f, 0.2f, 0.9f, 0.3f);
 149         cairo_curve_to (pCairoContext, 0.9f, 0.4f, 0.8f, 0.5f, 0.6f, 0.5f);
 150         cairo_curve_to (pCairoContext, 0.8f, 0.5f, 0.9f, 0.6f, 0.9f, 0.7f);
 151         cairo_curve_to (pCairoContext, 0.9f, 0.8f, 0.8f, 0.9f, 0.7f, 0.9f);
 152         cairo_curve_to (pCairoContext, 0.6f, 0.9f, 0.5f, 0.8f, 0.5f, 0.6f);
 153         cairo_curve_to (pCairoContext, 0.5f, 0.8f, 0.4f, 0.9f, 0.3f, 0.9f);
 154         cairo_curve_to (pCairoContext, 0.2f, 0.9f, 0.1f, 0.8f, 0.1f, 0.7f);
 155         cairo_curve_to (pCairoContext, 0.1f, 0.6f, 0.2f, 0.5f, 0.3f, 0.5f);
 156         cairo_curve_to (pCairoContext, 0.2f, 0.5f, 0.1f, 0.4f, 0.1f, 0.3f);
 157         cairo_curve_to (pCairoContext, 0.1f, 0.2f, 0.2f, 0.1f, 0.3f, 0.1f);
 158         cairo_curve_to (pCairoContext, 0.4f, 0.1f, 0.5f, 0.2f, 0.5f, 0.3f);
 159
 160         cairo_restore (pCairoContext);
 161
 162         cairo_set_source_rgba (pCairoContext, 1.0f, 0.0f, 0.0f, 0.75f);
 163         cairo_fill (pCairoContext);
 164         cairo_restore (pCairoContext);
 165 }
 166