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Diffstat (limited to 'libcore/imagecreator.c')
| -rw-r--r-- | libcore/imagecreator.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/libcore/imagecreator.c b/libcore/imagecreator.c new file mode 100644 index 0000000..65eea04 --- /dev/null +++ b/libcore/imagecreator.c @@ -0,0 +1,202 @@ +#include "imagecreator.h" + +cImageCreator::cImageCreator(void) { + surface = NULL; + cr = NULL; +} + +cImageCreator::~cImageCreator() { + if (cr) + cairo_destroy (cr); + if (surface) + cairo_surface_destroy (surface); +} + +bool cImageCreator::InitCairoImage(int width, int height) { + this->width = width; + this->height = height; + if (width < 1 || height < 1 || width > 1920 || height > 1080) + return false; + surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height); + cr = cairo_create(surface); + cairo_set_antialias(cr, CAIRO_ANTIALIAS_BEST); + return true; +} + +/********************************************************************************** +* Public Functions +**********************************************************************************/ + +///< 0 draws the entire ellipse +///< 1..4 draws only the first, second, third or fourth quadrant, respectively +///< 5..8 draws the right, top, left or bottom half, respectively +///< -1..-4 draws the inverted part of the given quadrant +///< If Quadrants is not 0, the coordinates are those of the actual area, not +///< the full circle! +void cImageCreator::DrawEllipse(tColor color, int quadrants) { + if (!cr || !surface) + return; + //center of the ellipse + double x, y; + //radius + double radius; + //start and stop angle (radian) + double arcStart, arcStop; + //scaling factors + double scaleX, scaleY; + //draw inverted ellipse + bool inverted; + + scaleX = width; + scaleY = height; + inverted = false; + + switch (quadrants) { + case 0: + x = 0.5; + y = 0.5; + radius = 0.5; + arcStart = 0.0; + arcStop = 2 * M_PI; + break; + case 1: + x = 0.0; + y = 1.0; + radius = 1.0; + arcStart = M_PI; + arcStop = 2 * M_PI; + break; + case 2: + x = 1.0; + y = 1.0; + radius = 1.0; + arcStart = M_PI; + arcStop = 2 * M_PI; + break; + case 3: + x = 1.0; + y = 0.0; + radius = 1.0; + arcStart = 0; + arcStop = M_PI; + break; + case 4: + x = 0.0; + y = 0.0; + radius = 1.0; + arcStart = 0; + arcStop = M_PI; + break; + case 5: + scaleX = 2 * width; + x = 0.0; + y = 0.5; + radius = 0.5; + arcStart = 0; + arcStop = 2* M_PI; + break; + case 6: + scaleY = 2 * height; + x = 0.5; + y = 0.5; + radius = 0.5; + arcStart = 0; + arcStop = 2* M_PI; + break; + case 7: + scaleX = 2 * width; + x = 0.5; + y = 0.5; + radius = 0.5; + arcStart = 0; + arcStop = 2* M_PI; + break; + case 8: + scaleY = 2 * height; + x = 0.5; + y = 0.0; + radius = 0.5; + arcStart = 0; + arcStop = 2* M_PI; + break; + case -1: + x = 0.0; + y = 1.0; + radius = 1.0; + arcStart = M_PI; + arcStop = 2* M_PI; + inverted = true; + break; + case -2: + x = 1.0; + y = 1.0; + radius = 1.0; + arcStart = M_PI; + arcStop = 2 * M_PI; + inverted = true; + break; + case -3: + x = 1.0; + y = 0.0; + radius = 1.0; + arcStart = 0; + arcStop = M_PI; + inverted = true; + break; + case -4: + x = 0.0; + y = 0.0; + radius = 1.0; + arcStart = 0; + arcStop = M_PI; + inverted = true; + break; + default: + x = 0.5; + y = 0.5; + radius = 0.5; + arcStart = 0.0; + arcStop = 2 * M_PI; + break; + } + + SetColor(color); + //Draw Background for inverted ellipses + if (inverted) { + cairo_rectangle(cr, 0.0, 0.0, width, height); + cairo_fill (cr); + cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR); + } + //Draw Ellipse + cairo_scale(cr, scaleX, scaleY); + cairo_arc(cr, x, y, radius, arcStart, arcStop); + cairo_fill(cr); +} + +cImage *cImageCreator::GetImage(void) { + if (!cr || !surface) + NULL; + unsigned char *data = cairo_image_surface_get_data(surface); + cImage *image = new cImage(cSize(width, height), (tColor*)data); + return image; +} + +/********************************************************************************** +* Private Functions +**********************************************************************************/ + +void cImageCreator::SetColor(tColor color) { + if (!cr || !surface) + return; + tIndex tAlpha = (color & 0xFF000000) >> 24; + tIndex tRed = (color & 0x00FF0000) >> 16; + tIndex tGreen = (color & 0x0000FF00) >> 8; + tIndex tBlue = (color & 0x000000FF); + + double a = (int)tAlpha / (double)255; + double r = (int)tRed / (double)255; + double g = (int)tGreen / (double)255; + double b = (int)tBlue / (double)255; + + cairo_set_source_rgba(cr, r, g, b, a); +} |