305 lines
8.4 KiB
C
305 lines
8.4 KiB
C
/*
|
||
* 程序清单：bmp_zoom演示
|
||
*/
|
||
#include "demo_view.h"
|
||
#include <rtgui/dc.h>
|
||
#include <rtgui/image.h>
|
||
#include <rtgui/image_bmp.h>
|
||
#include <rtgui/widgets/label.h>
|
||
#include <rtgui/widgets/button.h>
|
||
#include <rtgui/widgets/textbox.h>
|
||
#include <rtgui/widgets/container.h>
|
||
|
||
#if defined(RTGUI_USING_DFS_FILERW)
|
||
struct demo_bmp_dt
|
||
{
|
||
float scale, angle;
|
||
char *filename;
|
||
struct rtgui_image *image;
|
||
struct rtgui_image *showimg;
|
||
rtgui_container_t *showbox;
|
||
rtgui_textbox_t *box;
|
||
rtgui_rect_t lastrect;
|
||
}bmpdt;
|
||
|
||
rt_bool_t demo_bitmap_showbox(struct rtgui_object* object, struct rtgui_event* event)
|
||
{
|
||
rtgui_container_t *container;
|
||
rtgui_widget_t *widget;
|
||
|
||
RT_ASSERT(object != RT_NULL);
|
||
|
||
container = RTGUI_CONTAINER(object);
|
||
widget = RTGUI_WIDGET(object);
|
||
|
||
if(event->type == RTGUI_EVENT_PAINT)
|
||
{
|
||
int w, h;
|
||
rtgui_rect_t rect;
|
||
struct rtgui_dc *dc;
|
||
struct rtgui_image *image = bmpdt.showimg;
|
||
/* 如果从其他标签切换到当前标签, image应该是RT_NULL, 重置它 */
|
||
if(image == RT_NULL && bmpdt.image != RT_NULL)
|
||
{
|
||
image = bmpdt.image;
|
||
bmpdt.scale = 1.0f;
|
||
bmpdt.angle = 0.0f;
|
||
rtgui_widget_get_rect(RTGUI_WIDGET(bmpdt.showbox), &bmpdt.lastrect);
|
||
rtgui_rect_inflate(&bmpdt.lastrect, -RTGUI_WIDGET_BORDER(bmpdt.showbox));
|
||
}
|
||
|
||
dc = rtgui_dc_begin_drawing(widget);
|
||
if (dc == RT_NULL)
|
||
return RT_FALSE;
|
||
|
||
rtgui_widget_get_rect(widget, &rect);
|
||
/* 在绘制边框后, 再将rect缩小填充背景, 可以降低闪烁现象 */
|
||
rtgui_dc_draw_border(dc, &rect, RTGUI_WIDGET_BORDER_STYLE(widget));
|
||
rtgui_rect_inflate(&rect, -RTGUI_WIDGET_BORDER(widget));
|
||
w = rtgui_rect_width(bmpdt.lastrect);
|
||
h = rtgui_rect_height(bmpdt.lastrect);
|
||
if(w > rtgui_rect_width(rect)) w = rtgui_rect_width(rect);
|
||
if(h > rtgui_rect_height(rect)) h = rtgui_rect_height(rect);
|
||
|
||
/* fill container with background */
|
||
/*
|
||
* 参数lastrect会记录上一次绘图所用区域
|
||
* 每次重绘时,只需与lastrect比较,即可得知那些背景区域需要刷新
|
||
* 例如当放大图片时,lastrect比当前绘图区小,所有无需更新背景区,
|
||
* 当缩小图片时, 也仅需要更新绘图区比lastrect大的区域.
|
||
*/
|
||
if(image != RT_NULL)
|
||
{ /* 减少不必要的绘图 */
|
||
rtgui_rect_t rc;
|
||
if(w > image->w)
|
||
{
|
||
rc.x1 = image->w;
|
||
rc.y1 = bmpdt.lastrect.y1;
|
||
rc.x2 = bmpdt.lastrect.x2;
|
||
rc.y2 = (h > image->h) ? image->h : bmpdt.lastrect.y2;
|
||
rtgui_dc_fill_rect(dc, &rc);
|
||
}
|
||
if(h > image->h)
|
||
{
|
||
rc.x1 = bmpdt.lastrect.x1;
|
||
rc.y1 = image->h;
|
||
rc.x2 = bmpdt.lastrect.x2;
|
||
rc.y2 = bmpdt.lastrect.y2;
|
||
rtgui_dc_fill_rect(dc, &rc);
|
||
}
|
||
}
|
||
else
|
||
rtgui_dc_fill_rect(dc, &bmpdt.lastrect);
|
||
|
||
/* 将图像数据blit到画布上 */
|
||
if (image != RT_NULL)
|
||
{
|
||
int value;
|
||
rtgui_image_blit(image, dc, &rect);
|
||
bmpdt.lastrect.x1 = bmpdt.lastrect.y1 = RTGUI_WIDGET_BORDER(bmpdt.showbox);
|
||
|
||
if(image->w > rtgui_rect_width(rect))
|
||
value = rtgui_rect_width(rect);
|
||
else
|
||
value = image->w;
|
||
bmpdt.lastrect.x2 = bmpdt.lastrect.x1 + value;
|
||
|
||
if(image->h > rtgui_rect_height(rect))
|
||
value = rtgui_rect_height(rect);
|
||
else
|
||
value = image->h;
|
||
bmpdt.lastrect.y2 = bmpdt.lastrect.y1 + value;
|
||
}
|
||
|
||
rtgui_dc_end_drawing(dc);
|
||
return RT_FALSE;
|
||
}
|
||
return rtgui_container_event_handler(object, event);
|
||
}
|
||
|
||
void demo_bitmap_open(struct rtgui_object* object, struct rtgui_event* event)
|
||
{
|
||
char *str;
|
||
rtgui_button_t *button = RTGUI_BUTTON(object);
|
||
/* 从textbox控件中取得文件名 */
|
||
str = (char*)rtgui_textbox_get_value(bmpdt.box);
|
||
if(str == RT_NULL) return;
|
||
if(*str == '/' && (rt_strstr(str, ".bmp")!=RT_NULL || rt_strstr(str, ".BMP")!=RT_NULL))
|
||
{ /* 如果是bmp文件, 且文件名有效, 则读入图像数据 */
|
||
if(bmpdt.filename != RT_NULL)
|
||
rt_free(bmpdt.filename);
|
||
bmpdt.filename = rt_strdup(str);
|
||
|
||
if(bmpdt.image != RT_NULL)
|
||
rtgui_image_destroy(bmpdt.image);
|
||
|
||
bmpdt.image = rtgui_image_create_from_file("bmp", bmpdt.filename, RT_TRUE);
|
||
|
||
if(bmpdt.image != RT_NULL)
|
||
{
|
||
bmpdt.showimg = bmpdt.image;
|
||
bmpdt.scale = 1.0;
|
||
bmpdt.angle = 0.0;
|
||
rtgui_widget_update(RTGUI_WIDGET(bmpdt.showbox));
|
||
}
|
||
}
|
||
else
|
||
rt_kprintf("Bad filename!");
|
||
}
|
||
|
||
void demo_image_zoom_in(struct rtgui_object* object, struct rtgui_event* event)
|
||
{
|
||
rtgui_button_t *button = RTGUI_BUTTON(object);
|
||
|
||
if (bmpdt.image == RT_NULL) return;
|
||
|
||
if (bmpdt.scale > 0.45)
|
||
{ /* 更新缩放倍率 */
|
||
if (bmpdt.scale > 1.0) bmpdt.scale -= (float)0.5;
|
||
else bmpdt.scale -= (float)0.1;
|
||
}
|
||
/* 根据缩放倍率, 缩放原始图形, 并得到新图形的指针 */
|
||
bmpdt.showimg = rtgui_image_zoom(bmpdt.image, bmpdt.scale, bmpdt.scale, RTGUI_IMG_ZOOM_BILINEAR);
|
||
if (bmpdt.showimg != RT_NULL)
|
||
rtgui_widget_update(RTGUI_WIDGET(bmpdt.showbox));
|
||
else
|
||
return;
|
||
if(bmpdt.showimg != bmpdt.image)
|
||
{ /* 释放掉新图形所用的资源 */
|
||
rtgui_image_destroy(bmpdt.showimg);
|
||
bmpdt.showimg = RT_NULL;
|
||
}
|
||
}
|
||
|
||
void demo_image_zoom_out(struct rtgui_object* object, struct rtgui_event* event)
|
||
{
|
||
rtgui_button_t *button = RTGUI_BUTTON(object);
|
||
|
||
if (bmpdt.image == RT_NULL) return;
|
||
|
||
if (bmpdt.scale < 4.95)
|
||
{ /* 更新缩放倍率 */
|
||
if (bmpdt.scale > 0.95) bmpdt.scale += (float)0.5;
|
||
else bmpdt.scale += (float)0.1;
|
||
}
|
||
|
||
bmpdt.showimg = rtgui_image_zoom(bmpdt.image, bmpdt.scale, bmpdt.scale, RTGUI_IMG_ZOOM_BILINEAR);
|
||
if (bmpdt.showimg != RT_NULL)
|
||
rtgui_widget_update(RTGUI_WIDGET(bmpdt.showbox));
|
||
else
|
||
return;
|
||
if(bmpdt.showimg != bmpdt.image)
|
||
{
|
||
rtgui_image_destroy(bmpdt.showimg);
|
||
bmpdt.showimg = RT_NULL;
|
||
}
|
||
}
|
||
|
||
void demo_image_rotate(struct rtgui_object* object, struct rtgui_event* event)
|
||
{
|
||
rtgui_button_t *button = RTGUI_BUTTON(object);
|
||
|
||
if (bmpdt.image == RT_NULL) return;
|
||
/* 更新图像旋转角度 */
|
||
if (bmpdt.angle < 360.0)
|
||
bmpdt.angle += (float)1.0;
|
||
else
|
||
bmpdt.angle = 0.0;
|
||
/* 调用旋转函数执行旋转, 并取得一个新的图像指针 */
|
||
bmpdt.showimg = rtgui_image_rotate(bmpdt.image, bmpdt.angle);
|
||
if (bmpdt.showimg != RT_NULL)
|
||
rtgui_widget_update(RTGUI_WIDGET(bmpdt.showbox));
|
||
else
|
||
return;
|
||
if(bmpdt.showimg != bmpdt.image)
|
||
{
|
||
rtgui_image_destroy(bmpdt.showimg);
|
||
bmpdt.showimg = RT_NULL;
|
||
}
|
||
}
|
||
|
||
rtgui_container_t *demo_view_bmp(void)
|
||
{
|
||
rtgui_rect_t rect;
|
||
rtgui_container_t *container, *showbox;
|
||
rtgui_button_t *button;
|
||
rtgui_textbox_t *box;
|
||
/* 用bmpdt结构体记录一些参数 */
|
||
rt_memset(&bmpdt, 0, sizeof(struct demo_bmp_dt));
|
||
bmpdt.scale = 1.0;
|
||
bmpdt.angle = 0.0;
|
||
/* 创建用于演示本代码的容器控件 */
|
||
container = demo_view("Bmp File:");
|
||
|
||
demo_view_get_rect(container, &rect);
|
||
rect.x1 += 85;
|
||
rect.x2 -= 5;
|
||
rect.y1 -= 42;
|
||
rect.y2 = rect.y1 + 20;
|
||
box = rtgui_textbox_create("", RTGUI_TEXTBOX_SINGLE);
|
||
rtgui_widget_set_rect(RTGUI_WIDGET(box), &rect);
|
||
rtgui_container_add_child(container, RTGUI_WIDGET(box));
|
||
bmpdt.box = box;
|
||
/* create a button "open" */
|
||
demo_view_get_rect(container, &rect);
|
||
rect.x1 += 5;
|
||
rect.x2 = rect.x1 + 60;
|
||
rect.y1 -= 10;
|
||
rect.y2 = rect.y1 + 24;
|
||
button = rtgui_button_create("open");
|
||
rtgui_widget_set_rect(RTGUI_WIDGET(button), &rect);
|
||
rtgui_container_add_child(container, RTGUI_WIDGET(button));
|
||
rtgui_button_set_onbutton(button, demo_bitmap_open);
|
||
|
||
/* create a button "zoom in" */
|
||
demo_view_get_rect(container, &rect);
|
||
rect.x1 += 85;
|
||
rect.x2 = rect.x1 + 70;
|
||
rect.y1 -= 10;
|
||
rect.y2 = rect.y1 + 24;
|
||
button = rtgui_button_create("zoom in");
|
||
rtgui_widget_set_rect(RTGUI_WIDGET(button), &rect);
|
||
rtgui_container_add_child(container, RTGUI_WIDGET(button));
|
||
rtgui_button_set_onbutton(button, demo_image_zoom_in);
|
||
|
||
/* create a button "zoom out" */
|
||
demo_view_get_rect(container, &rect);
|
||
rect.x1 += 165;
|
||
rect.x2 = rect.x1 + 70;
|
||
rect.y1 -= 10;
|
||
rect.y2 = rect.y1 + 24;
|
||
button = rtgui_button_create("zoom out");
|
||
rtgui_widget_set_rect(RTGUI_WIDGET(button), &rect);
|
||
rtgui_container_add_child(container, RTGUI_WIDGET(button));
|
||
rtgui_button_set_onbutton(button, demo_image_zoom_out);
|
||
|
||
/* create a button "rotate" */
|
||
demo_view_get_rect(container, &rect);
|
||
rect.x1 += 245;
|
||
rect.x2 = rect.x1 + 70;
|
||
rect.y1 -= 10;
|
||
rect.y2 = rect.y1 + 24;
|
||
button = rtgui_button_create("rotate");
|
||
rtgui_widget_set_rect(RTGUI_WIDGET(button), &rect);
|
||
rtgui_container_add_child(container, RTGUI_WIDGET(button));
|
||
rtgui_button_set_onbutton(button, demo_image_rotate);
|
||
|
||
/* create a container "showbox" */
|
||
demo_view_get_rect(container, &rect);
|
||
rect.x1 += 5;
|
||
rect.x2 -= 5;
|
||
rect.y1 += 20;
|
||
rect.y2 -= 0;
|
||
showbox = rtgui_container_create();
|
||
rtgui_widget_set_rect(RTGUI_WIDGET(showbox), &rect);
|
||
rtgui_container_add_child(container, RTGUI_WIDGET(showbox));
|
||
rtgui_widget_set_border(RTGUI_WIDGET(showbox), RTGUI_BORDER_SIMPLE);
|
||
bmpdt.showbox = showbox;
|
||
rtgui_object_set_event_handler(RTGUI_OBJECT(showbox), demo_bitmap_showbox);
|
||
rtgui_widget_get_rect(RTGUI_WIDGET(showbox), &bmpdt.lastrect);
|
||
rtgui_rect_inflate(&bmpdt.lastrect, -RTGUI_WIDGET_BORDER(showbox));
|
||
|
||
return container;
|
||
}
|
||
#endif
|