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thorvg/examples/Capi.cpp
Mira Grudzinska 422674b4c9 api: add focal parameters to the radial apis 
API modification:
- Result RadialGradient::radial(float cx, float cy, float radius)
- Result RadialGradient::radial(float cx, float cy, float r, float fx, float fy, float fr)
- Result RadialGradient::radial(float* cx, float* cy, float* radius)
- Result RadialGradient::radial(float* cx, float* cy, float* r, float* fx = nullptr, float* fy = nullptr, float* fr = nullptr)

@Issue: https://github.com/thorvg/thorvg/issues/2860
2024-10-23 11:10:14 +09:00

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/*
* Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <thorvg_capi.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_syswm.h>
#include <stdio.h>
#define WIDTH 800
#define HEIGHT 800
/************************************************************************/
/* Capi Test Code */
/************************************************************************/
static Tvg_Canvas* canvas = NULL;
static Tvg_Animation* animation = NULL;
void contents()
{
//////1. Linear gradient shape with a linear gradient stroke
//Set a shape
Tvg_Paint* shape1 = tvg_shape_new();
tvg_shape_move_to(shape1, 25.0f, 25.0f);
tvg_shape_line_to(shape1, 375.0f, 25.0f);
tvg_shape_cubic_to(shape1, 500.0f, 100.0f, -500.0f, 200.0f, 375.0f, 375.0f);
tvg_shape_close(shape1);
//Prepare a gradient for the fill
Tvg_Gradient* grad1 = tvg_linear_gradient_new();
tvg_linear_gradient_set(grad1, 25.0f, 25.0f, 200.0f, 200.0f);
Tvg_Color_Stop color_stops1[4] =
{
{0.00f, 255, 0, 0, 155},
{0.33f, 0, 255, 0, 100},
{0.66f, 255, 0, 255, 100},
{1.00f, 0, 0, 255, 155}
};
tvg_gradient_set_color_stops(grad1, color_stops1, 4);
tvg_gradient_set_spread(grad1, TVG_STROKE_FILL_REFLECT);
//Prepare a gradient for the stroke
Tvg_Gradient* grad1_stroke = tvg_gradient_duplicate(grad1);
//Set a gradient fill
tvg_shape_set_linear_gradient(shape1, grad1);
//Set a gradient stroke
tvg_shape_set_stroke_width(shape1, 20.0f);
tvg_shape_set_stroke_linear_gradient(shape1, grad1_stroke);
tvg_shape_set_stroke_join(shape1, TVG_STROKE_JOIN_ROUND);
//////2. Solid transformed shape
//Set a shape
const Tvg_Path_Command* cmds;
uint32_t cmdCnt;
const Tvg_Point* pts;
uint32_t ptsCnt;
Tvg_Paint* shape2 = tvg_shape_new();
tvg_shape_get_path_commands(shape1, &cmds, &cmdCnt);
tvg_shape_get_path_coords(shape1, &pts, &ptsCnt);
tvg_shape_append_path(shape2, cmds, cmdCnt, pts, ptsCnt);
tvg_shape_set_fill_color(shape2, 255, 255, 255, 128);
//Transform a shape
tvg_paint_scale(shape2, 0.3f);
tvg_paint_translate(shape2, 100.0f, 100.0f);
//Push shapes 1 and 2 into the canvas
tvg_canvas_push(canvas, shape1);
tvg_canvas_push(canvas, shape2);
//////3. Radial gradient shape with a radial dashed stroke
//Set a shape
Tvg_Paint* shape3 = tvg_shape_new();
tvg_shape_append_rect(shape3, 550.0f, 20.0f, 100.0f, 50.0f, 0.0f, 0.0f);
tvg_shape_append_circle(shape3, 600.0f, 150.0f, 100.0f, 50.0f);
tvg_shape_append_rect(shape3, 550.0f, 230.0f, 100.0f, 100.0f, 20.0f, 40.0f);
//Prepare a radial gradient for the fill
Tvg_Gradient* grad2 = tvg_radial_gradient_new();
tvg_radial_gradient_set(grad2, 600.0f, 180.0f, 50.0f, 640.0f, 180.0f, 0.0f);
Tvg_Color_Stop color_stops2[3] =
{
{0.0f, 255, 0, 255, 255},
{0.5f, 0, 0, 255, 255},
{1.0f, 50, 55, 155, 255}
};
tvg_gradient_set_color_stops(grad2, color_stops2, 3);
tvg_gradient_set_spread(grad2, TVG_STROKE_FILL_PAD);
//Set a gradient fill
tvg_shape_set_radial_gradient(shape3, grad2);
//Prepare a radial gradient for the stroke
uint32_t cnt;
const Tvg_Color_Stop* color_stops2_get;
tvg_gradient_get_color_stops(grad2, &color_stops2_get, &cnt);
float cx, cy, r, fx, fy, fr;
tvg_radial_gradient_get(grad2, &cx, &cy, &r, &fx, &fy, &fr);
Tvg_Gradient* grad2_stroke = tvg_radial_gradient_new();
tvg_radial_gradient_set(grad2_stroke, cx, cy, r, fx, fy, fr);
tvg_gradient_set_color_stops(grad2_stroke, color_stops2_get, cnt);
tvg_gradient_set_spread(grad2_stroke, TVG_STROKE_FILL_REPEAT);
//Set a gradient stroke
tvg_shape_set_stroke_width(shape3, 30.0f);
tvg_shape_set_stroke_radial_gradient(shape3, grad2_stroke);
tvg_paint_set_opacity(shape3, 200);
//Push the shape into the canvas
tvg_canvas_push(canvas, shape3);
//////4. Scene
//Set a scene
Tvg_Paint* scene = tvg_scene_new();
//Set circles
Tvg_Paint* scene_shape1 = tvg_shape_new();
tvg_shape_append_circle(scene_shape1, 80.0f, 650.f, 40.0f, 140.0f);
tvg_shape_append_circle(scene_shape1, 180.0f, 600.f, 40.0f, 60.0f);
tvg_shape_set_fill_color(scene_shape1, 0, 0, 255, 150);
tvg_shape_set_stroke_color(scene_shape1, 75, 25, 155, 255);
tvg_shape_set_stroke_width(scene_shape1, 10.0f);
tvg_shape_set_stroke_cap(scene_shape1, Tvg_Stroke_Cap::TVG_STROKE_CAP_ROUND);
tvg_shape_set_stroke_join(scene_shape1, Tvg_Stroke_Join::TVG_STROKE_JOIN_ROUND);
tvg_shape_set_stroke_trim(scene_shape1, 0.25f, 0.75f, true);
//Set circles with a dashed stroke
Tvg_Paint* scene_shape2 = tvg_paint_duplicate(scene_shape1);
tvg_shape_set_fill_color(scene_shape2, 75, 25, 155, 200);
//Prapare a dash for the stroke
float dashPattern[4] = {15.0f, 30.0f, 2.0f, 30.0f};
tvg_shape_set_stroke_dash(scene_shape2, dashPattern, 4, 0.0f);
tvg_shape_set_stroke_cap(scene_shape2, TVG_STROKE_CAP_ROUND);
tvg_shape_set_stroke_color(scene_shape2, 0, 0, 255, 255);
tvg_shape_set_stroke_width(scene_shape2, 15.0f);
//Transform a shape
tvg_paint_scale(scene_shape2, 0.8f);
tvg_paint_rotate(scene_shape2, -90.0f);
tvg_paint_translate(scene_shape2, -200.0f, 800.0f);
//Push the shapes into the scene
tvg_scene_push(scene, scene_shape1);
tvg_scene_push(scene, scene_shape2);
//Push the scene into the canvas
tvg_canvas_push(canvas, scene);
//////5. Masked picture
//Set a scene
Tvg_Paint* pict = tvg_picture_new();
if (tvg_picture_load(pict, EXAMPLE_DIR"/svg/tiger.svg") != TVG_RESULT_SUCCESS) {
printf("Problem with loading an svg file\n");
tvg_paint_del(pict);
} else {
float w, h;
tvg_picture_get_size(pict, &w, &h);
tvg_picture_set_size(pict, w/2, h/2);
Tvg_Matrix m = {0.8f, 0.0f, 400.0f, 0.0f, 0.8f, 400.0f, 0.0f, 0.0f, 1.0f};
tvg_paint_set_transform(pict, &m);
// Set a composite shape
Tvg_Paint* comp = tvg_shape_new();
tvg_shape_append_circle(comp, 600.0f, 600.0f, 100.0f, 100.0f);
tvg_shape_set_fill_color(comp, 0, 0, 0, 200);
tvg_paint_set_mask_method(pict, comp, TVG_MASK_METHOD_INVERSE_ALPHA);
//Push the scene into the canvas
tvg_canvas_push(canvas, pict);
}
//////6. Animation with a picture
//instead loading from a memory, an animation can be loaded directly from a file using:
//tvg_picture_load(pict_lottie, EXAMPLE_DIR"/lottie/sample.json")
FILE *file = fopen(EXAMPLE_DIR"/lottie/sample.json", "r");
if (file == NULL) return;
fseek(file, 0, SEEK_END);
long data_size = ftell(file);
fseek(file, 0, SEEK_SET);
auto data = (char*)malloc(data_size + 1);
if (!data) return;
if (fread(data, 1, data_size, file) != (size_t)data_size) {
free(data);
fclose(file);
return;
}
//ensure null-termination in case tvg_picture_load_data is called with copy = false
data[data_size++] = '\0';
animation = tvg_animation_new();
Tvg_Paint* pict_lottie = tvg_animation_get_picture(animation);
if (tvg_picture_load_data(pict_lottie, data, data_size, nullptr, nullptr, false) != TVG_RESULT_SUCCESS) {
printf("Problem with loading a lottie file\n");
tvg_animation_del(animation);
} else {
tvg_paint_scale(pict_lottie, 3.0f);
tvg_canvas_push(canvas, pict_lottie);
}
free(data);
fclose(file);
//////7. Text
//load from a file
if (tvg_font_load(EXAMPLE_DIR"/font/SentyCloud.ttf") != TVG_RESULT_SUCCESS) {
printf("Problem with loading the font from the file. Did you enable TTF Loader?\n");
} else {
Tvg_Paint *text = tvg_text_new();
tvg_text_set_font(text, "SentyCloud", 25.0f, "");
tvg_text_set_fill_color(text, 0, 0, 255);
tvg_text_set_text(text, "\xE7\xB4\xA2\xE5\xB0\x94\x56\x47\x20\xE6\x98\xAF\xE6\x9C\x80\xE5\xA5\xBD\xE7\x9A\x84");
tvg_paint_translate(text, 50.0f, 380.0f);
tvg_canvas_push(canvas, text);
}
//load from a memory
file = fopen(EXAMPLE_DIR"/font/SentyCloud.ttf", "rb");
if (file == NULL) return;
fseek(file, 0, SEEK_END);
data_size = ftell(file);
fseek(file, 0, SEEK_SET);
data = (char*)malloc(data_size);
if (!data) return;
if (fread(data, 1, data_size, file) != (size_t)data_size) {
free(data);
fclose(file);
return;
}
if (tvg_font_load_data("Arial", data, data_size, "ttf", true) != TVG_RESULT_SUCCESS) {
printf("Problem with loading the font file from a memory. Did you enable TTF Loader?\n");
} else {
//Radial gradient
Tvg_Gradient* grad = tvg_radial_gradient_new();
tvg_radial_gradient_set(grad, 200.0f, 200.0f, 20.0f, 200.0f, 200.0f, 0.0f);
Tvg_Color_Stop color_stops[2] =
{
{0.0f, 255, 0, 255, 255},
{1.0f, 0, 0, 255, 255}
};
tvg_gradient_set_color_stops(grad, color_stops, 2);
tvg_gradient_set_spread(grad, TVG_STROKE_FILL_REFLECT);
Tvg_Paint *text = tvg_text_new();
tvg_text_set_font(text, "Arial", 20.0f, "italic");
tvg_text_set_gradient(text, grad);
tvg_text_set_text(text, "ThorVG is the best");
tvg_paint_translate(text, 70.0f, 420.0f);
tvg_canvas_push(canvas, text);
}
free(data);
fclose(file);
}
float progress(uint32_t elapsed, float durationInSec)
{
auto duration = (uint32_t)(durationInSec * 1000.0f); //sec -> millisec.
auto clamped = elapsed % duration;
return ((float)clamped / (float)duration);
}
/************************************************************************/
/* Entry Point */
/************************************************************************/
int main(int argc, char **argv)
{
tvg_engine_init(Tvg_Engine(TVG_ENGINE_SW), 0);
SDL_Init(SDL_INIT_VIDEO);
SDL_Window* window = SDL_CreateWindow("ThorVG Example (Software)", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIDTH, HEIGHT, SDL_WINDOW_SHOWN);
SDL_Surface* surface = SDL_GetWindowSurface(window);
//create the canvas
canvas = tvg_swcanvas_create();
tvg_swcanvas_set_target(canvas, (uint32_t*)surface->pixels, surface->w, surface->pitch / 4, surface->h, TVG_COLORSPACE_ARGB8888);
tvg_swcanvas_set_mempool(canvas, TVG_MEMPOOL_POLICY_DEFAULT);
contents();
SDL_Event event;
auto running = true;
auto ptime = SDL_GetTicks();
auto elapsed = 0;
while (running) {
//SDL Event handling
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT: {
running = false;
break;
}
case SDL_KEYUP: {
if (event.key.keysym.sym == SDLK_ESCAPE) {
running = false;
}
break;
}
}
}
//Clear the canvas
tvg_canvas_clear(canvas, false, true);
//Update the animation
if (animation) {
float duration, totalFrame;
tvg_animation_get_duration(animation, &duration);
tvg_animation_get_total_frame(animation, &totalFrame);
tvg_animation_set_frame(animation, totalFrame * progress(elapsed, duration));
}
//Draw the canvas
tvg_canvas_update(canvas);
tvg_canvas_draw(canvas);
tvg_canvas_sync(canvas);
SDL_UpdateWindowSurface(window);
auto ctime = SDL_GetTicks();
elapsed += (ctime - ptime);
ptime = ctime;
}
SDL_DestroyWindow(window);
SDL_Quit();
tvg_engine_term(Tvg_Engine(TVG_ENGINE_SW));
return 0;
}
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