Issue #130. Add Cairo tests for curves, linear_gradient and radial_gradient.

1 files changed, 47 insertions, 1 deletions

diff --git a/src/cairo-tests/curves.cpp b/src/cairo-tests/curves.cpp
index 270e510..e40d3b2 100644
--- a/src/cairo-tests/curves.cpp
+++ b/src/cairo-tests/curves.cpp
@@ -6,17 +6,22 @@
  */
 #include <config.h>
 
-#include <stdio.h>
 #include <stdlib.h>
 #include <cairo.h>
+#include <math.h>
 
 #include "caskbench.h"
 #include "caskbench_context.h"
 #include "cairo-shapes.h"
 
+static double delta = 0;
+
 int
 ca_setup_curves(caskbench_context_t *ctx)
 {
+    cairo_set_antialias (ctx->cairo_cr, CAIRO_ANTIALIAS_NONE);
+    cairo_set_line_width (ctx->cairo_cr, 1);
+
     return 1;
 }
 
@@ -28,6 +33,47 @@ ca_teardown_curves(void)
 int
 ca_test_curves(caskbench_context_t *ctx)
 {
+    cairo_t *cr = ctx->cairo_cr;
+    int cp = ctx->canvas_width / 2; // center point
+    int rr = ctx->canvas_width / 2;
+    int nn = 32; // must be even
+    double step = (2 * M_PI) / nn;
+
+    for (int i=0; i<ctx->size; i++) {
+        double angle = delta;  // in radians
+        double x = cp + rr * cos(angle);
+        double y = cp + rr * sin(angle);
+
+        // begin path
+        cairo_new_path(cr);
+        cairo_move_to (cr, x, y);
+
+        // segments
+        for (int j=0; j<nn; j++) {
+            double r = rr * drand48() / 8.0;
+
+            double angle1 = j * step + delta;
+            double x1 = cp + r * cos(angle1);
+            double y1 = cp + r * sin(angle1);
+
+            double x2 = cp + rr * cos(angle1);
+            double y2 = cp + rr * sin(angle1);
+
+            cairo_curve_to (ctx->cairo_cr,
+                            x1, y1,
+                            x2, y2, x2,y2);
+        }
+        cairo_close_path(cr);
+        cairoRandomizeColor(ctx);
+
+        // TODO: apply other fill types
+        if (ctx->shape_defaults.fill_type == CB_FILL_SOLID) {
+            cairo_fill (cr);
+        }
+        cairo_stroke (cr);
+
+    }
+    delta += 0.5;
     return 1;
 }