initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/3rdparty/nanosvg/example/example1.c

@@ -0,0 +1,258 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#include <stdio.h>
+#include <string.h>
+#include <float.h>
+#include <GLFW/glfw3.h>
+
+#define NANOSVG_IMPLEMENTATION
+#include "nanosvg.h"
+
+NSVGimage* g_image = NULL;
+
+static unsigned char bgColor[4] = {205,202,200,255};
+static unsigned char lineColor[4] = {0,160,192,255};
+
+static float distPtSeg(float x, float y, float px, float py, float qx, float qy)
+{
+	float pqx, pqy, dx, dy, d, t;
+	pqx = qx-px;
+	pqy = qy-py;
+	dx = x-px;
+	dy = y-py;
+	d = pqx*pqx + pqy*pqy;
+	t = pqx*dx + pqy*dy;
+	if (d > 0) t /= d;
+	if (t < 0) t = 0;
+	else if (t > 1) t = 1;
+	dx = px + t*pqx - x;
+	dy = py + t*pqy - y;
+	return dx*dx + dy*dy;
+}
+
+static void cubicBez(float x1, float y1, float x2, float y2,
+					 float x3, float y3, float x4, float y4,
+					 float tol, int level)
+{
+	float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234;
+	float d;
+	
+	if (level > 12) return;
+
+	x12 = (x1+x2)*0.5f;
+	y12 = (y1+y2)*0.5f;
+	x23 = (x2+x3)*0.5f;
+	y23 = (y2+y3)*0.5f;
+	x34 = (x3+x4)*0.5f;
+	y34 = (y3+y4)*0.5f;
+	x123 = (x12+x23)*0.5f;
+	y123 = (y12+y23)*0.5f;
+	x234 = (x23+x34)*0.5f;
+	y234 = (y23+y34)*0.5f;
+	x1234 = (x123+x234)*0.5f;
+	y1234 = (y123+y234)*0.5f;
+
+	d = distPtSeg(x1234, y1234, x1,y1, x4,y4);
+	if (d > tol*tol) {
+		cubicBez(x1,y1, x12,y12, x123,y123, x1234,y1234, tol, level+1); 
+		cubicBez(x1234,y1234, x234,y234, x34,y34, x4,y4, tol, level+1); 
+	} else {
+		glVertex2f(x4, y4);
+	}
+}
+
+void drawPath(float* pts, int npts, char closed, float tol)
+{
+	int i;
+	glBegin(GL_LINE_STRIP);
+	glColor4ubv(lineColor);
+	glVertex2f(pts[0], pts[1]);
+	for (i = 0; i < npts-1; i += 3) {
+		float* p = &pts[i*2];
+		cubicBez(p[0],p[1], p[2],p[3], p[4],p[5], p[6],p[7], tol, 0);
+	}
+	if (closed) {
+		glVertex2f(pts[0], pts[1]);
+	}
+	glEnd();
+}
+
+void drawControlPts(float* pts, int npts)
+{
+	int i;
+
+	// Control lines
+	glColor4ubv(lineColor);
+	glBegin(GL_LINES);
+	for (i = 0; i < npts-1; i += 3) {
+		float* p = &pts[i*2];
+		glVertex2f(p[0],p[1]);
+		glVertex2f(p[2],p[3]);
+		glVertex2f(p[4],p[5]);
+		glVertex2f(p[6],p[7]);
+	}
+	glEnd();
+
+	// Points
+	glPointSize(6.0f);
+	glColor4ubv(lineColor);
+
+	glBegin(GL_POINTS);
+	glVertex2f(pts[0],pts[1]);
+	for (i = 0; i < npts-1; i += 3) {
+		float* p = &pts[i*2];
+		glVertex2f(p[6],p[7]);
+	}
+	glEnd();
+
+	// Points
+	glPointSize(3.0f);
+
+	glBegin(GL_POINTS);
+	glColor4ubv(bgColor);
+	glVertex2f(pts[0],pts[1]);
+	for (i = 0; i < npts-1; i += 3) {
+		float* p = &pts[i*2];
+		glColor4ubv(lineColor);
+		glVertex2f(p[2],p[3]);
+		glVertex2f(p[4],p[5]);
+		glColor4ubv(bgColor);
+		glVertex2f(p[6],p[7]);
+	}
+	glEnd();
+}
+
+void drawframe(GLFWwindow* window)
+{
+	int width = 0, height = 0;
+	float view[4], cx, cy, hw, hh, aspect, px;
+	NSVGshape* shape;
+	NSVGpath* path;
+
+	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
+	glfwGetFramebufferSize(window, &width, &height);
+
+	glViewport(0, 0, width, height);
+	glClearColor(220.0f/255.0f, 220.0f/255.0f, 220.0f/255.0f, 1.0f);
+	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glDisable(GL_TEXTURE_2D);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+
+	// Fit view to bounds
+	cx = g_image->width*0.5f;
+	cy = g_image->height*0.5f;
+	hw = g_image->width*0.5f;
+	hh = g_image->height*0.5f;
+
+	if (width/hw < height/hh) {
+		aspect = (float)height / (float)width;
+		view[0] = cx - hw * 1.2f;
+		view[2] = cx + hw * 1.2f;
+		view[1] = cy - hw * 1.2f * aspect;
+		view[3] = cy + hw * 1.2f * aspect;
+	} else {
+		aspect = (float)width / (float)height;
+		view[0] = cx - hh * 1.2f * aspect;
+		view[2] = cx + hh * 1.2f * aspect;
+		view[1] = cy - hh * 1.2f;
+		view[3] = cy + hh * 1.2f;
+	}
+	// Size of one pixel.
+	px = (view[2] - view[1]) / (float)width;
+
+	glOrtho(view[0], view[2], view[3], view[1], -1, 1);
+
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+	glDisable(GL_DEPTH_TEST);
+	glColor4ub(255,255,255,255);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+
+	// Draw bounds
+	glColor4ub(0,0,0,64);
+	glBegin(GL_LINE_LOOP);
+	glVertex2f(0, 0);
+	glVertex2f(g_image->width, 0);
+	glVertex2f(g_image->width, g_image->height);
+	glVertex2f(0, g_image->height);
+	glEnd();
+
+	for (shape = g_image->shapes; shape != NULL; shape = shape->next) {
+		for (path = shape->paths; path != NULL; path = path->next) {
+			drawPath(path->pts, path->npts, path->closed, px * 1.5f);
+			drawControlPts(path->pts, path->npts);
+		}
+	}
+
+	glfwSwapBuffers(window);
+}
+
+void resizecb(GLFWwindow* window, int width, int height)
+{
+	// Update and render
+	NSVG_NOTUSED(width);
+	NSVG_NOTUSED(height);
+	drawframe(window);
+}
+
+int main()
+{
+	GLFWwindow* window;
+	const GLFWvidmode* mode;
+
+	if (!glfwInit())
+		return -1;
+
+	mode = glfwGetVideoMode(glfwGetPrimaryMonitor());
+    window = glfwCreateWindow(mode->width - 40, mode->height - 80, "Nano SVG", NULL, NULL);
+	if (!window)
+	{
+		printf("Could not open window\n");
+		glfwTerminate();
+		return -1;
+	}
+
+	glfwSetFramebufferSizeCallback(window, resizecb);
+	glfwMakeContextCurrent(window);
+	glEnable(GL_POINT_SMOOTH);
+	glEnable(GL_LINE_SMOOTH);
+
+
+	g_image = nsvgParseFromFile("../example/nano.svg", "px", 96.0f);
+	if (g_image == NULL) {
+		printf("Could not open SVG image.\n");
+		glfwTerminate();
+		return -1;
+	}
+
+	while (!glfwWindowShouldClose(window))
+	{
+		drawframe(window);
+		glfwPollEvents();
+	}
+
+	nsvgDelete(g_image);
+
+	glfwTerminate();
+	return 0;
+}