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| author |  Chris Xiong <chirs241097@gmail.com>
| 2015-10-06 21:28:40 +0800 |
|---|---|---|
| committer | Chris Xiong <chirs241097@gmail.com>
| 2015-10-06 21:28:40 +0800 |
| commit | 038b31f0158a0018dbf2eceb71026cc4e665faa9 (patch) | |
| tree | a373ddab7bc162e477e28a780b0d729660ff8634 /smelt/sdl/CxImage/ximath.cpp | |
| parent | a8077292d5d9118866f7358c11a90c855e1b1b02 (diff) | |
| download | SMELT-038b31f0158a0018dbf2eceb71026cc4e665faa9.tar.xz | |
Add the SMELT files...
Please, do not laugh too loudly.
Diffstat (limited to 'smelt/sdl/CxImage/ximath.cpp')
| -rw-r--r-- | smelt/sdl/CxImage/ximath.cpp | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/smelt/sdl/CxImage/ximath.cpp b/smelt/sdl/CxImage/ximath.cpp new file mode 100644 index 0000000..0175184 --- /dev/null +++ b/smelt/sdl/CxImage/ximath.cpp @@ -0,0 +1,97 @@ +#include "ximage.h"
+#include "ximath.h"
+#include <math.h>
+
+//this module should contain some classes for geometrical transformations
+//usable with selections, etc... once it's done, that is. :)
+
+CxPoint2::CxPoint2()
+{
+ x=y=0.0f;
+}
+
+CxPoint2::CxPoint2(float const x_, float const y_)
+{
+ x=x_;
+ y=y_;
+}
+
+CxPoint2::CxPoint2(CxPoint2 const &p)
+{
+ x=p.x;
+ y=p.y;
+}
+
+float CxPoint2::Distance(CxPoint2 const p2)
+{
+ return (float)sqrt((x-p2.x)*(x-p2.x)+(y-p2.y)*(y-p2.y));
+}
+
+float CxPoint2::Distance(float const x_, float const y_)
+{
+ return (float)sqrt((x-x_)*(x-x_)+(y-y_)*(y-y_));
+}
+
+CxRect2::CxRect2()
+{
+}
+
+CxRect2::CxRect2(float const x1_, float const y1_, float const x2_, float const y2_)
+{
+ botLeft.x=x1_;
+ botLeft.y=y1_;
+ topRight.x=x2_;
+ topRight.y=y2_;
+}
+
+CxRect2::CxRect2(CxRect2 const &p)
+{
+ botLeft=p.botLeft;
+ topRight=p.topRight;
+}
+
+float CxRect2::Surface() const
+/*
+ * Returns the surface of rectangle.
+ */
+{
+ return (topRight.x-botLeft.x)*(topRight.y-botLeft.y);
+}
+
+CxRect2 CxRect2::CrossSection(CxRect2 const &r2) const
+/*
+ * Returns crossection with another rectangle.
+ */
+{
+ CxRect2 cs;
+ cs.botLeft.x=max(botLeft.x, r2.botLeft.x);
+ cs.botLeft.y=max(botLeft.y, r2.botLeft.y);
+ cs.topRight.x=min(topRight.x, r2.topRight.x);
+ cs.topRight.y=min(topRight.y, r2.topRight.y);
+ if (cs.botLeft.x<=cs.topRight.x && cs.botLeft.y<=cs.topRight.y) {
+ return cs;
+ } else {
+ return CxRect2(0,0,0,0);
+ }//if
+}
+
+CxPoint2 CxRect2::Center() const
+/*
+ * Returns the center point of rectangle.
+ */
+{
+ return CxPoint2((topRight.x+botLeft.x)/2.0f, (topRight.y+botLeft.y)/2.0f);
+}
+
+float CxRect2::Width() const
+//returns rectangle width
+{
+ return topRight.x-botLeft.x;
+}
+
+float CxRect2::Height() const
+//returns rectangle height
+{
+ return topRight.y-botLeft.y;
+}
+
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