void src_shape(RenBase& rbase, color c1, color c2,
double x1, double y1, double x2, double y2)
{
typedef RenBase renderer_base_type;
typedef agg::gradient_x gradient_func_type;
typedef agg::gradient_linear_color<color> color_func_type;
typedef agg::span_interpolator_linear<> interpolator_type;
typedef agg::span_allocator<color> span_allocator_type;
typedef agg::span_gradient<color,
interpolator_type,
gradient_func_type,
color_func_type> span_gradient_type;
gradient_func_type gradient_func; // The gradient function
agg::trans_affine gradient_mtx = gradient_affine(x1, y1, x2, y2, 100);
interpolator_type span_interpolator(gradient_mtx); // Span interpolator
span_allocator_type span_allocator; // Span Allocator
color_func_type color_func(c1, c2);
span_gradient_type span_gradient(span_interpolator,
gradient_func,
color_func,
0, 100);
agg::rasterizer_scanline_aa<> ras;
agg::scanline_u8 sl;
agg::rounded_rect shape(x1, y1, x2, y2, 40);
// agg::ellipse shape((x1+x2)/2, (y1+y2)/2, fabs(x2-x1)/2, fabs(y2-y1)/2, 100);
ras.add_path(shape);
agg::render_scanlines_aa(ras, sl, rbase, span_allocator, span_gradient);
}
void radial_shape(RenBase& rbase, const ColorRamp& colors,
double x1, double y1, double x2, double y2)
{
typedef RenBase renderer_base_type;
typedef agg::gradient_radial gradient_func_type;
typedef ColorRamp color_func_type;
typedef agg::span_interpolator_linear<> interpolator_type;
typedef agg::span_allocator<color> span_allocator_type;
typedef agg::span_gradient<color,
interpolator_type,
gradient_func_type,
color_func_type> span_gradient_type;
gradient_func_type gradient_func; // The gradient function
agg::trans_affine gradient_mtx;
interpolator_type span_interpolator(gradient_mtx); // Span interpolator
span_allocator_type span_allocator; // Span Allocator
span_gradient_type span_gradient(span_interpolator,
gradient_func,
colors,
0, 100);
double cx = (x1 + x2) / 2.0;
double cy = (y1 + y2) / 2.0;
double r = 0.5 * (((x2 - x1) < (y2 - y1)) ? (x2 - x1) : (y2 - y1));
gradient_mtx *= agg::trans_affine_scaling(r / 100.0);
gradient_mtx *= agg::trans_affine_translation(cx, cy);
gradient_mtx *= trans_affine_resizing();
gradient_mtx.invert();
agg::ellipse ell(cx, cy, r, r, 100);
agg::conv_transform<agg::ellipse> trans(ell, trans_affine_resizing());
m_ras.add_path(trans);
agg::render_scanlines_aa(m_ras, m_sl, rbase, span_allocator, span_gradient);
}
void circle(RenBase& rbase, color c1, color c2,
double x1, double y1, double x2, double y2,
double shadow_alpha)
{
typedef RenBase renderer_base_type;
typedef agg::gradient_x gradient_func_type;
typedef agg::gradient_linear_color<color> color_func_type;
typedef agg::span_interpolator_linear<> interpolator_type;
typedef agg::span_allocator<color> span_allocator_type;
typedef agg::span_gradient<color,
interpolator_type,
gradient_func_type,
color_func_type> span_gradient_type;
gradient_func_type gradient_func; // The gradient function
agg::trans_affine gradient_mtx = gradient_affine(x1, y1, x2, y2, 100);
interpolator_type span_interpolator(gradient_mtx); // Span interpolator
span_allocator_type span_allocator; // Span Allocator
color_func_type color_func(c1, c2);
span_gradient_type span_gradient(span_interpolator,
gradient_func,
color_func,
0, 100);
agg::rasterizer_scanline_aa<> ras;
agg::scanline_u8 sl;
double r = agg::calc_distance(x1, y1, x2, y2) / 2;
agg::ellipse ell((x1+x2)/2+5, (y1+y2)/2-3, r, r, 100);
ras.add_path(ell);
agg::render_scanlines_aa_solid(ras, sl, rbase,
agg::rgba(0.6, 0.6, 0.6, 0.7*shadow_alpha));
ell.init((x1+x2)/2, (y1+y2)/2, r, r, 100);
ras.add_path(ell);
agg::render_scanlines_aa(ras, sl, rbase, span_allocator, span_gradient);
}
virtual void on_draw() {
typedef agg::renderer_base<pixfmt> base_ren_type;
pixfmt pf(rbuf_window());
base_ren_type ren_base(pf);
ren_base.clear(agg::rgba(1, 1, 1));
agg::scanline_u8 sl;
agg::rasterizer_scanline_aa<> ras;
// Draw some background
agg::ellipse ell;
srand(1234);
unsigned i;
unsigned w = unsigned(width());
unsigned h = unsigned(height());
for (i = 0; i < 100; i++) {
ell.init(rand() % w, rand() % h, rand() % 60 + 5, rand() % 60 + 5, 50);
ras.add_path(ell);
agg::render_scanlines_aa_solid(
ras, sl, ren_base,
agg::rgba(rand() / double(RAND_MAX), rand() / double(RAND_MAX),
rand() / double(RAND_MAX),
rand() / double(RAND_MAX) / 2.0));
}
double parallelogram[6];
parallelogram[0] = m_x[0];
parallelogram[1] = m_y[0];
parallelogram[2] = m_x[1];
parallelogram[3] = m_y[1];
parallelogram[4] = m_x[2];
parallelogram[5] = m_y[2];
// Gradient shape function (linear, radial, custom, etc)
//-----------------
typedef agg::gradient_circle gradient_func_type;
// Alpha gradient shape function (linear, radial, custom, etc)
//-----------------
typedef agg::gradient_xy gradient_alpha_func_type;
// Span interpolator. This object is used in all span generators
// that operate with transformations during iterating of the spans,
// for example, image transformers use the interpolator too.
//-----------------
typedef agg::span_interpolator_linear<> interpolator_type;
// Span allocator is an object that allocates memory for
// the array of colors that will be used to render the
// color spans. One object can be shared between different
// span generators.
//-----------------
typedef agg::span_allocator<color_type> span_allocator_type;
// Gradient colors array adaptor
//-----------------
typedef agg::pod_auto_array<color_type, 256> gradient_colors_type;
// Finally, the gradient span generator working with the color_type
// color type.
//-----------------
typedef agg::span_gradient<color_type, interpolator_type,
gradient_func_type,
gradient_colors_type> span_gradient_type;
// Gradient alpha array adaptor
//-----------------
typedef agg::pod_auto_array<color_type::value_type, 256>
gradient_alpha_type;
// The alpha gradient span converter working with the color_type
// color type.
//-----------------
typedef agg::span_gradient_alpha<
color_type, interpolator_type, gradient_alpha_func_type,
gradient_alpha_type> span_gradient_alpha_type;
// Span converter type
//-----------------
typedef agg::span_converter<span_gradient_type, span_gradient_alpha_type>
span_conv_type;
// The gradient objects declarations
//----------------
gradient_func_type gradient_func; // The gradient function
gradient_alpha_func_type alpha_func; // The gradient function
agg::trans_affine gradient_mtx; // Gradient affine transformer
agg::trans_affine alpha_mtx; // Alpha affine transformer
interpolator_type span_interpolator(
gradient_mtx); // Span gradient interpolator
interpolator_type span_interpolator_alpha(
alpha_mtx); // Span alpha interpolator
span_allocator_type span_allocator; // Span Allocator
gradient_colors_type color_array; // The gradient colors
// Declare the gradient span itself.
// The last two arguments are so called "d1" and "d2"
// defining two distances in pixels, where the gradient starts
// and where it ends. The actual meaning of "d1" and "d2" depands
// on the gradient function.
//----------------
span_gradient_type span_gradient(span_interpolator, gradient_func,
color_array, 0, 150);
// Declare the gradient span itself.
// The last two arguments are so called "d1" and "d2"
// defining two distances in pixels, where the gradient starts
// and where it ends. The actual meaning of "d1" and "d2" depands
// on the gradient function.
//----------------
gradient_alpha_type alpha_array;
span_gradient_alpha_type span_gradient_alpha(
span_interpolator_alpha, alpha_func, alpha_array, 0, 100);
// Span converter declaration
span_conv_type span_conv(span_gradient, span_gradient_alpha);
// Finally we can draw a circle.
//----------------
gradient_mtx *= agg::trans_affine_scaling(0.75, 1.2);
gradient_mtx *= agg::trans_affine_rotation(-agg::pi / 3.0);
gradient_mtx *= agg::trans_affine_translation(width() / 2, height() / 2);
gradient_mtx.invert();
alpha_mtx.parl_to_rect(parallelogram, -100, -100, 100, 100);
fill_color_array(color_array, agg::rgba(0, 0.19, 0.19),
agg::rgba(0.7, 0.7, 0.19), agg::rgba(0.31, 0, 0));
// Fill Alpha array
//----------------
for (i = 0; i < 256; i++) {
alpha_array[i] = color_type::from_double(m_alpha.value(i / 255.0));
}
ell.init(width() / 2, height() / 2, 150, 150, 100);
ras.add_path(ell);
// Render the circle with gradient plus alpha-gradient
agg::render_scanlines_aa(ras, sl, ren_base, span_allocator, span_conv);
// Draw the control points and the parallelogram
//-----------------
agg::rgba color_pnt(0, 0.4, 0.4, 0.31);
ell.init(m_x[0], m_y[0], 5, 5, 20);
ras.add_path(ell);
agg::render_scanlines_aa_solid(ras, sl, ren_base, color_pnt);
ell.init(m_x[1], m_y[1], 5, 5, 20);
ras.add_path(ell);
agg::render_scanlines_aa_solid(ras, sl, ren_base, color_pnt);
ell.init(m_x[2], m_y[2], 5, 5, 20);
ras.add_path(ell);
agg::render_scanlines_aa_solid(ras, sl, ren_base, color_pnt);
agg::vcgen_stroke stroke;
stroke.add_vertex(m_x[0], m_y[0], agg::path_cmd_move_to);
stroke.add_vertex(m_x[1], m_y[1], agg::path_cmd_line_to);
stroke.add_vertex(m_x[2], m_y[2], agg::path_cmd_line_to);
stroke.add_vertex(m_x[0] + m_x[2] - m_x[1], m_y[0] + m_y[2] - m_y[1],
agg::path_cmd_line_to);
stroke.add_vertex(0, 0, agg::path_cmd_end_poly | agg::path_flags_close);
ras.add_path(stroke);
agg::render_scanlines_aa_solid(ras, sl, ren_base, agg::rgba(0, 0, 0));
agg::render_ctrl(ras, sl, ren_base, m_alpha);
}
virtual void on_draw()
{
pixfmt pixf(rbuf_window());
renderer_base rb(pixf);
renderer_solid rs(rb);
rb.clear(agg::rgba(1, 1, 1));
// When Gamma changes rebuild the gamma and gradient LUTs
//------------------
if(m_old_gamma != m_gamma.value())
{
m_gamma_lut.gamma(m_gamma.value());
build_gradient_lut();
m_old_gamma = m_gamma.value();
}
// Gradient center. All gradient functions assume the
// center being in the origin (0,0) and you can't
// change it. But you can apply arbitrary transformations
// to the gradient (see below).
//------------------
double cx = initial_width() / 2;
double cy = initial_height() / 2;
double r = 100;
// Focal center. Defined in the gradient coordinates,
// that is, with respect to the origin (0,0)
//------------------
double fx = m_mouse_x - cx;
double fy = m_mouse_y - cy;
gradient_func_type gradient_func(r, fx, fy);
gradient_adaptor_type gradient_adaptor(gradient_func);
agg::trans_affine gradient_mtx;
// Making the affine matrix. Move to (cx,cy),
// apply the resizing transformations and invert
// the matrix. Gradients and images always assume the
// inverse transformations.
//------------------
gradient_mtx.translate(cx, cy);
gradient_mtx *= trans_affine_resizing();
gradient_mtx.invert();
interpolator_type span_interpolator(gradient_mtx);
span_gradient_type span_gradient(span_interpolator,
gradient_adaptor,
m_gradient_lut,
0, r);
// Form the simple rectangle
//------------------
m_rasterizer.reset();
m_rasterizer.move_to_d(0,0);
m_rasterizer.line_to_d(width(), 0);
m_rasterizer.line_to_d(width(), height());
m_rasterizer.line_to_d(0, height());
// Render the gradient to the whole screen and measure the time
//------------------
start_timer();
agg::render_scanlines_aa(m_rasterizer, m_scanline, rb, m_alloc, span_gradient);
double tm = elapsed_time();
// Draw the transformed circle that shows the gradient boundary
//------------------
agg::ellipse e(cx, cy, r, r);
agg::conv_stroke<agg::ellipse> estr(e);
agg::conv_transform<
agg::conv_stroke<
agg::ellipse> > etrans(estr, trans_affine_resizing());
m_rasterizer.add_path(etrans);
agg::render_scanlines_aa_solid(m_rasterizer, m_scanline, rb, agg::rgba(1,1,1));
// Show the gradient time
//------------------
char buf[64];
agg::gsv_text t;
t.size(10.0);
agg::conv_stroke<agg::gsv_text> pt(t);
pt.width(1.5);
sprintf(buf, "%3.2f ms", tm);
t.start_point(10.0, 35.0);
t.text(buf);
m_rasterizer.add_path(pt);
agg::render_scanlines_aa_solid(m_rasterizer, m_scanline, rb, agg::rgba(0,0,0));
#if !LINEAR_RGB
// Show the controls
//------------------
agg::render_ctrl(m_rasterizer, m_scanline, rb, m_gamma);
// Apply the inverse gamma to the whole buffer
// (transform the colors to the perceptually uniform space)
//------------------
pixf.apply_gamma_inv(m_gamma_lut);
#endif
}