diff options
Diffstat (limited to 'graphics')
-rw-r--r-- | graphics/primitives.cpp | 62 | ||||
-rw-r--r-- | graphics/primitives.h | 2 | ||||
-rw-r--r-- | graphics/surface.cpp | 11 | ||||
-rw-r--r-- | graphics/surface.h | 16 |
4 files changed, 40 insertions, 51 deletions
diff --git a/graphics/primitives.cpp b/graphics/primitives.cpp index 9834af65ba..b88db39f36 100644 --- a/graphics/primitives.cpp +++ b/graphics/primitives.cpp @@ -61,59 +61,21 @@ void drawLine(int x0, int y0, int x1, int y1, int color, void (*plotProc)(int, i } } +void drawThickLine(int x0, int y0, int x1, int y1, int penX, int penY, int color, void (*plotProc)(int, int, int, void *), void *data) { + assert(penX > 0 && penY > 0); -// FIXME: This is a limited version of thick line drawing -// it draws striped lines at some angles. Better algorithm could -// be found here: -// -// http://homepages.enterprise.net/murphy/thickline/index.html -// -// Feel free to replace it with better implementation -void drawThickLine(int x0, int y0, int x1, int y1, int thickness, int color, void (*plotProc)(int, int, int, void *), void *data) { - const bool steep = ABS(y1 - y0) > ABS(x1 - x0); - - if (steep) { - SWAP(x0, y0); - SWAP(x1, y1); - } - - float dx = x1 - x0; - float dy = y1 - y0; - float d = (float)sqrt(dx * dx + dy * dy); - - if (!d) + // Shortcut + if (penX == 1 && penY == 1) { + drawLine(x0, y0, x1, y1, color, plotProc, data); return; - - int thickX = (int)((float)thickness * dy / d / 2); - int thickY = (int)((float)thickness * dx / d / 2); - - const int delta_x = ABS(x1 - x0); - const int delta_y = ABS(y1 - y0); - const int delta_err = delta_y; - int x = x0; - int y = y0; - int err = 0; - - const int x_step = (x0 < x1) ? 1 : -1; - const int y_step = (y0 < y1) ? 1 : -1; - - if (steep) - drawLine(y - thickY, x + thickX, y + thickY, x - thickX, color, plotProc, data); - else - drawLine(x - thickX, y + thickY, x + thickX, y - thickY, color, plotProc, data); - - while (x != x1) { - x += x_step; - err += delta_err; - if (2 * err > delta_x) { - y += y_step; - err -= delta_x; - } - if (steep) - drawLine(y - thickY, x + thickX, y + thickY, x - thickX, color, plotProc, data); - else - drawLine(x - thickX, y + thickY, x + thickX, y - thickY, color, plotProc, data); } + + // TODO: Optimize this. It currently is a very naive way of handling + // thick lines since quite often it will be drawing to the same pixel + // multiple times. + for (int x = 0; x < penX; x++) + for (int y = 0; y < penY; y++) + drawLine(x0 + x, y0 + y, x1 + x, y1 + y, color, plotProc, data); } } // End of namespace Graphics diff --git a/graphics/primitives.h b/graphics/primitives.h index 0ab2dabcd8..f0780afc2e 100644 --- a/graphics/primitives.h +++ b/graphics/primitives.h @@ -25,7 +25,7 @@ namespace Graphics { void drawLine(int x0, int y0, int x1, int y1, int color, void (*plotProc)(int, int, int, void *), void *data); -void drawThickLine(int x0, int y0, int x1, int y1, int thickness, int color, void (*plotProc)(int, int, int, void *), void *data); +void drawThickLine(int x0, int y0, int x1, int y1, int penX, int penY, int color, void (*plotProc)(int, int, int, void *), void *data); } // End of namespace Graphics diff --git a/graphics/surface.cpp b/graphics/surface.cpp index c0f1046eae..a37dd57e61 100644 --- a/graphics/surface.cpp +++ b/graphics/surface.cpp @@ -49,6 +49,17 @@ void Surface::drawLine(int x0, int y0, int x1, int y1, uint32 color) { error("Surface::drawLine: bytesPerPixel must be 1, 2, or 4"); } +void Surface::drawThickLine(int x0, int y0, int x1, int y1, int penX, int penY, uint32 color) { + if (format.bytesPerPixel == 1) + Graphics::drawThickLine(x0, y0, x1, y1, penX, penY, color, plotPoint<byte>, this); + else if (format.bytesPerPixel == 2) + Graphics::drawThickLine(x0, y0, x1, y1, penX, penY, color, plotPoint<uint16>, this); + else if (format.bytesPerPixel == 4) + Graphics::drawThickLine(x0, y0, x1, y1, penX, penY, color, plotPoint<uint32>, this); + else + error("Surface::drawThickLine: bytesPerPixel must be 1, 2, or 4"); +} + void Surface::create(uint16 width, uint16 height, const PixelFormat &f) { free(); diff --git a/graphics/surface.h b/graphics/surface.h index eb8d1ac42e..9c8c040cbf 100644 --- a/graphics/surface.h +++ b/graphics/surface.h @@ -153,10 +153,26 @@ struct Surface { * @param x1 The x coordinate of the end point. * @param y1 The y coordinate of the end point. * @param color The color of the line. + * @note This is just a wrapper around Graphics::drawLine */ void drawLine(int x0, int y0, int x1, int y1, uint32 color); /** + * Draw a thick line. + * + * @param x0 The x coordinate of the start point. + * @param y0 The y coordiante of the start point. + * @param x1 The x coordinate of the end point. + * @param y1 The y coordinate of the end point. + * @param penX The width of the pen (thickness in the x direction) + * @param penY The height of the pen (thickness in the y direction) + * @param color The color of the line. + * @note This is just a wrapper around Graphics::drawThickLine + * @note The x/y coordinates of the start and end points are the upper-left most part of the pen + */ + void drawThickLine(int x0, int y0, int x1, int y1, int penX, int penY, uint32 color); + + /** * Draw a horizontal line. * * @param x The start x coordinate of the line. |