Transformation matrix

1 files changed, 55 insertions, 0 deletions

diff --git a/libtests/matrix.cc b/libtests/matrix.cc
new file mode 100644
index 00000000..d27e96cf
--- /dev/null
+++ b/libtests/matrix.cc
@@ -0,0 +1,55 @@
+#include <qpdf/QPDFMatrix.hh>
+#include <qpdf/QUtil.hh>
+#include <assert.h>
+#include <iostream>
+
+static void check(QPDFMatrix const& m, std::string const& exp)
+{
+    std::string u = m.unparse();
+    if (u != exp)
+    {
+        std::cout << "got " << u << ", wanted " << exp << std::endl;
+    }
+}
+
+static void check_xy(double x, double y, std::string const& exp)
+{
+    std::string u = (QUtil::double_to_string(x, 2) + " " +
+                     QUtil::double_to_string(y, 2));
+    if (u != exp)
+    {
+        std::cout << "got " << u << ", wanted " << exp << std::endl;
+    }
+}
+
+int main()
+{
+    QPDFMatrix m;
+    check(m, "1.00000 0.00000 0.00000 1.00000 0.00000 0.00000");
+    m.translate(10, 20);
+    check(m, "1.00000 0.00000 0.00000 1.00000 10.00000 20.00000");
+    m.scale(1.5, 2);
+    check(m, "1.50000 0.00000 0.00000 2.00000 10.00000 20.00000");
+    m.translate(30, 40);
+    check(m, "1.50000 0.00000 0.00000 2.00000 55.00000 100.00000");
+    m.concat(QPDFMatrix(1, 2, 3, 4, 5, 6));
+    check(m, "1.50000 4.00000 4.50000 8.00000 62.50000 112.00000");
+    m.rotatex90(90);
+    check(m, "4.50000 8.00000 -1.50000 -4.00000 62.50000 112.00000");
+    m.rotatex90(180);
+    check(m, "-4.50000 -8.00000 1.50000 4.00000 62.50000 112.00000");
+    m.rotatex90(270);
+    check(m, "-1.50000 -4.00000 -4.50000 -8.00000 62.50000 112.00000");
+    m.rotatex90(180);
+    check(m, "1.50000 4.00000 4.50000 8.00000 62.50000 112.00000");
+    m.rotatex90(12345);
+    check(m, "1.50000 4.00000 4.50000 8.00000 62.50000 112.00000");
+
+    double xp = 0;
+    double yp = 0;
+    m.transform(240, 480, xp, yp);
+    check_xy(xp, yp, "2582.50 4912.00");
+
+    std::cout << "matrix tests done" << std::endl;
+    return 0;
+}